MCP48FVBXX [MICROCHIP]
8-/10-/12-Bit Single/Dual Voltage Output Volatile Digital-to-Analog Converters with SPI Interface;
| 型号： | MCP48FVBXX |
| 厂家： | 
MICROCHIP |
| 描述： | 8-/10-/12-Bit Single/Dual Voltage Output Volatile Digital-to-Analog Converters with SPI Interface |
| 文件： | 总84页 (文件大小：1093K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MCP48FVBXX
8-/10-/12-Bit Single/Dual Voltage Output Volatile
Digital-to-Analog Converters with SPI Interface
Features
Package Types
MCP48FVBX1
• Operating Voltage Range:
MSOP
Single
- 2.7V to 5.5V - full specifications
- 1.8V to 2.7V - reduced device specifications
• Output Voltage Resolutions:
V
SDI
SCK
SDO
10
9
DD
1
2
3
4
5
CS
REF0
V
V
8
-
8-bit: MCP48FVB0X (256 Steps)
V
7
SS
OUT0
NC
- 10-bit: MCP48FVB1X (1024 Steps)
- 12-bit: MCP48FVB2X (4096 Steps)
• Rail-to-Rail Output
6
LAT0/HVC
MCP48FVBX2
MSOP
• Fast Settling Time of 7.8 µs (typical)
• DAC Voltage Reference Source Options:
- Device VDD
Dual
V
SDI
SCK
SDO
DD
10
9
1
2
3
4
5
CS
(1)
- External VREF pin (buffered or unbuffered)
- Internal Band Gap (1.22V typical)
• Output Gain Options:
V
V
V
8
REF
V
7
SS
OUT0
OUT1
(1)
6
LAT/HVC
Note 1: Associated with both DAC0 and DAC1
- Unity (1x)
- 2x
General Description
• Power-on/Brown-out Reset Protection
• Power-Down Modes:
The MCP48FVBXX are Single- and Dual-channel 8-bit,
10-bit, and 12-bit buffered voltage output
Digital-to-Analog Converters (DAC) with volatile
memory and an SPI serial interface.
- Disconnects output buffer (High Impedance)
- Selection of VOUT pull-down resistors
(100 k or 1 k)
• Low Power Consumption:
The VREF pin, the device VDD or the internal band gap
voltage can be selected as the DAC’s reference
voltage. When VDD is selected, VDD is connected
internally to the DAC reference circuit. When the VREF
pin is used, the user can select the output buffer’s gain
to be 1 or 2. When the gain is 2, the VREF pin voltage
should be limited to a maximum of VDD/2.
- Normal operation: <180 µA (Single),
380 µA (Dual)
- Power-down operation: 650 nA typical
• SPI Interface:
- Supports ‘00’ and ‘11’ modes
- Up to 20 MHz writes and 10 MHz reads
These devices have an SPI-compatible serial interface.
Write commands are supported up to 20 MHz while
read commands are supported up to 10 MHz.
- Input buffers support interfacing to
low-voltage digital devices
• Package Types: 10-lead MSOP
• Extended Temperature Range: -40°C to +125°C
Applications
• Set Point or Offset Trimming
• Sensor Calibration
• Low-Power Portable Instrumentation
• PC Peripherals
• Data Acquisition Systems
• Motor Control
2015 Microchip Technology Inc.
DS20005466A-page 1
MCP48FVBXX
MCP48FVBX1 Device Block Diagram (Single-Channel Output)
VDD
Power-up/
Brown-out Control
VSS
Memory (32x16)
SDI
SDO
SCK
CS
DAC0 (Vol)
VREF (Vol)
Power-down (Vol)
Gain (Vol)
SPI Serial Interface Module
and
Control Logic
Status (Vol)
VREF1:VREF0
and PD1:PD0
VDD
Gain
PD1:PD0 and
VBG
VREF1:VREF0
Band Gap
Op
Amp
(1.22V)
VOUT0
PD1:PD0
VREF0
+
-
(1)
VSS
PD1:PD0
VDD
VREF1:VREF0
LAT0/HVC
Note 1: If Internal Band Gap is selected, this buffer has a 2x gain. If the G bit = ‘1’, this is a total gain of 4.
DS20005466A-page 2
2015 Microchip Technology Inc.
MCP48FVBXX
MCP48FVBX2 Device Block Diagram (Dual-Channel Output)
VDD
Power-up/
Brown-out Control
VSS
Memory (32x16)
SDI
SDO
SCK
CS
DAC0 and DAC1 (Vol)
VREF (Vol)
Power-down (Vol)
Gain (Vol)
SPI Serial Interface Module
and
Control Logic
Status (Vol)
VREF1:VREF0
and PD1:PD0
VDD
Gain
PD1:PD0 and
VREF1:VREF0
Op
Amp
VBG
VOUT0
Band Gap
(1.22V)
PD1:PD0
VREF
+
(1)
-
PD1:PD0
VSS
VDD
VREF1:VREF0
LAT/HVC
VREF1:VREF0
and PD1:PD0
Gain
VDD
Op
Amp
PD1:PD0 and
VREF1:VREF0
VOUT1
Band Gap
(1.22V)
intVR1
PD1:PD0
+
-
(1)
PD1:PD0
VSS
VDD
VREF1:VREF0
Note 1: If Internal Band Gap is selected, this buffer has a 2x gain, if the G bit = ‘1’, this is a total gain of 4.
2015 Microchip Technology Inc.
DS20005466A-page 3
MCP48FVBXX
Device Features
Device
# of
LAT
Inputs
# of
VREF
Inputs
Internal
band
gap ?
Specified
Memory Operating Range
(2)
(VDD)
MCP48FVB01
MCP48FVB11
MCP48FVB21
MCP48FVB02
MCP48FVB12
MCP48FVB22
MCP48FEB01
MCP48FEB11
MCP48FEB21
MCP48FEB02
MCP48FEB12
MCP48FEB22
MCP47FVB01
MCP47FVB11
MCP47FVB21
MCP47FVB02
MCP47FVB12
MCP47FVB22
MCP47FEB01
MCP47FEB11
MCP47FEB21
MCP47FEB02
MCP47FEB12
MCP47FEB22
1
1
1
2
2
2
1
1
1
2
2
2
1
1
1
2
2
2
1
1
1
2
2
2
8
SPI
SPI
SPI
SPI
SPI
SPI
SPI
SPI
SPI
SPI
SPI
SPI
I2C
I2C
I2C
I2C
I2C
I2C
I2C
I2C
I2C
I2C
I2C
I2C
7Fh
1FFh
7FFh
7Fh
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
RAM
RAM
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
10
12
8
RAM
RAM
10
12
8
1FFh
7FFh
7Fh
RAM
RAM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
RAM
10
12
8
1FFh
7FFh
7Fh
10
12
8
1FFh
7FFh
7Fh
10
12
8
1FFh
7FFh
7Fh
RAM
RAM
RAM
10
12
8
1FFh
7FFh
7Fh
RAM
RAM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
10
12
8
1FFh
7FFh
7Fh
10
12
1FFh
7FFh
Note 1: Factory Default value. The DAC output POR/BOR value can be modified via the nonvolatile DAC output
register(s) (available only on nonvolatile devices (MCP4XFEBXX)).
2: Analog output performance specified from 2.7V to 5.5V.
DS20005466A-page 4
2015 Microchip Technology Inc.
MCP48FVBXX
1.0
ELECTRICAL CHARACTERISTICS
(†)
Absolute Maximum Ratings
Voltage on VDD with respect to VSS ......................................................................................................... -0.6V to +6.5V
Voltage on all pins with respect to VSS ............................................................................................... -0.6V to VDD+0.3V
Input clamp current, IIK (VI < 0, VI > VDD, VI > VPP on HV pins) ..........................................................................±20 mA
Output clamp current, IOK (VO < 0 or VO > VDD)...................................................................................................±20 mA
Maximum current out of VSS pin
(Single)..........................................................................................................50 mA
(Dual)...........................................................................................................100 mA
Maximum current into VDD pin
(Single)..........................................................................................................50 mA
(Dual)...........................................................................................................100 mA
Maximum current sourced by the VOUT pin ............................................................................................................20 mA
Maximum current sunk by the VOUT pin..................................................................................................................20 mA
Maximum current sunk by the VREF pin.................................................................................................................125 µA
Maximum input current source/sunk by SDI, SCK, and CS pins .............................................................................2 mA
Maximum output current sunk by SDO Output pin .................................................................................................25 mA
Total power dissipation (1) ....................................................................................................................................400 mW
Package power dissipation (TA = +50°C, TJ = +150°C)
MSOP-10 ..................................................................................................................................................490 mW
ESD protection on all pins ±4 kV (HBM)
±400V (MM)
±1.5 kV (CDM)
Latch-Up (per JEDEC JESD78A) @ +125°C .....................................................................................................±100 mA
Storage temperature ...............................................................................................................................-65°C to +150°C
Ambient temperature with power applied ...............................................................................................-55°C to +125°C
Soldering temperature of leads (10 seconds)....................................................................................................... +300°C
Maximum Junction Temperature (TJ).................................................................................................................... +150°C
† Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods
may affect device reliability.
Note 1: Power dissipation is calculated as follows:
PDIS = VDD x {IDD - IOH} + {(VDD – VOH) x IOH} + (VOL x IOL
)
2015 Microchip Technology Inc.
DS20005466A-page 5
MCP48FVBXX
DC CHARACTERISTICS
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
DC Characteristics
Gx = ‘0’, RL = 5 k from VOUT to VSS, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Supply Voltage
VDD
2.7
1.8
—
—
5.5
2.7
V
V
DAC operation (reduced analog
specifications) and Serial Interface
VDD Voltage
(rising) to ensure device
Power-on Reset
VPOR/BOR
—
—
1.7
V
RAM retention voltage (VRAM) < VPOR
VDD voltages greater than VPOR/BOR
limit Ensure that device is out of reset.
VDD Rise Rate to ensure
Power-on Reset
VDDRR
VHV
(Note 3)
V/ms
V
High-Voltage Commands
Voltage Range (HVC pin)
VSS
9.0
—
12.5
—
The HVC pin will be at one of three input
(1)
levels (VIL, VIH or VIHH
)
High-Voltage
VIHHEN
—
V
Threshold for Entry into
WiperLock Technology -
for compatibility with
Input Entry Voltage
MCP48FEBxx devices
High-Voltage
Input Exit Voltage
VIHHEX
TPORD
—
—
—
VDD + 0.8V
50
V
(Note 2)
Power-on Reset to
Output-Driven Delay
25
µs VDD rising, VDD > VPOR
Note 1
Note 2
Note 3
This parameter is ensured by design.
This parameter is ensured by characterization.
POR/BOR voltage trip point is not slope dependent. Hysteresis implemented with time delay.
DS20005466A-page 6
2015 Microchip Technology Inc.
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
DC
Characteristics VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
Gx = ‘0’, RL = 5 k from VOUT to VSS, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym.
Min.
—
Typ.
—
Max.
320
Units
µA
Conditions
1MHz (2)
Supply Current
IDD
Single
Dual
Serial Interface Active
(Not High-Voltage Command)
VRxB:VRxA = ‘01’ (6)
VOUT is unloaded, VDD = 5.5V
10 MHz (2)
20 MHz
—
—
910
µA
—
—
—
—
1.7
mA
µA
1 MHz (2)
510
Volatile DAC Register = 000h
10 MHz (2)
20 MHz
—
—
1.1
mA
—
—
—
—
1.85
250
mA
µA
1 MHz (2)
10 MHz (2)
20 MHz (2)
1 MHz (2)
10 MHz (2)
20 MHz (2)
Single
Serial Interface Active
(Not High-Voltage Command)
VRxB:VRxA = ‘10’ (4)
VOUT is unloaded.
—
—
—
—
—
—
—
—
—
—
840
1.65
380
970
1.75
µA
mA
µA
VREF = VDD = 5.5V
Dual
Volatile DAC Register = 000h
µA
mA
Serial Interface Inactive (2)
(Not High-Voltage Command)
VRxB:VRxA = ‘00’
—
—
—
—
180
380
µA
µA
Single
Dual
SCK = SDI = VSS
VOUT is unloaded.
Volatile DAC Register = 000h
Serial Interface Inactive (2)
(Not High-Voltage Command)
VRxB:VRxA = ‘11’, VREF = VDD
—
—
—
—
180
380
µA
µA
Single
Dual
SCK = SDI = VSS
VOUT is unloaded.
Volatile DAC Register = 000h
—
—
145
260
180
400
µA
µA
Single HVC = 12.5V (High-Voltage Command)
Serial Interface Inactive
Dual
VREF = VDD = 5.5V, LAT/HVC = VIHH
DAC registers = 000h
VOUT pins are unloaded
PDxB:PDxA = ‘01’ (5)
VOUT not connected
Power-Down
Current
IDDP
—
0.65
3.8
µA
Note 2 This parameter is ensured by characterization.
Note 4 Supply current is independent of current through the resistor ladder in mode VRxB:VRxA = ‘10’.
Note 5 The PDxB:PDxA = ‘01’, ‘10’, and ‘11’ configurations should have the same current.
Note 6 By design, this is the worst-case current mode.
2015 Microchip Technology Inc.
DS20005466A-page 7
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
DC Characteristics
Gx = ‘0’, RL = 5 k from VOUT to VSS, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
1.8V VDD 5.5V
VREF 1.0V (7)
RL
100
140
180
k
Resistor Ladder
Resistance
Resolution
(# of Resistors and
# of Taps)
N
256
1024
4096
Taps
Taps
Taps
8-bit No Missing Codes
10-bit No Missing Codes
12-bit No Missing Codes
(see B.1 “Resolution”)
Nominal VOUT Match (11)
2.7V VDD 5.5V (2)
|VOUT - VOUTMEAN
/VOUTMEAN
|
—
0.5
1.0
%
%
1.8V (2)
—
—
—
1.2
—
VOUT Tempco
VOUT/T
15
ppm/°C Code = Mid-scale
(7Fh, 1FFh or 7FFh)
(See B.19 “VOUT Tem-
perature Coefficient”
VREF pin
1.8V VDD 5.5V (1)
VREF
VSS
—
VDD
V
Input Voltage Range
Note 1
Note 2
Note 7
This parameter is ensured by design.
This parameter is ensured by characterization.
Resistance is defined as the resistance between the VREF pin (mode VRxB:VRxA = ‘10’) to VSS pin.
For dual-channel devices (MCP48FVBX2), this is the effective resistance of the each resistor ladder.
The resistance measurement is that of the two resistor ladders measured in parallel.
Note 11
Variation of one output voltage to mean output voltage.
DS20005466A-page 8
2015 Microchip Technology Inc.
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
DC
Characteristics VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
Gx = ‘0’, RL = 5 k from VOUT to VSS, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Zero-Scale Error
(see
EZS
—
—
0.75
LSb 8-bit
VRxB:VRxA = ‘11’, Gx = ‘0’
VREF = VDD, No Load
B.5 “Zero-Scale
Error (EZS)”)
(Code = 000h)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
LSb
LSb
LSb
LSb
VRxB:VRxA = ‘00’, Gx = ‘0’
VDD = 5.5V, No Load
VDD = 1.8V, VREF = 1.0V
VRxB:VRxA = ‘10’, Gx = ‘0’, No Load
VDD = 1.8V, VREF = 1.0V
VRxB:VRxA = ‘11’, Gx = ‘0’, No Load
VRxB:VRxA = ‘01’, Gx = ‘0’, No Load
—
—
3
LSb 10-bit VRxB:VRxA = ‘11’, Gx = ‘0’
VREF = VDD, No Load
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
LSb
LSb
LSb
LSb
VRxB:VRxA = ‘00’, Gx = ‘0’
VDD = 5.5V, No Load
VDD = 1.8V, VREF = 1.0V
VRxB:VRxA = ‘10’, Gx = ‘0’, No Load
VDD = 1.8V, VREF = 1.0V
VRxB:VRxA = ‘11’, Gx = ‘0’, No Load
VRxB:VRxA = ‘01’, Gx = ‘0’
No Load
—
—
12
LSb 12-bit VRxB:VRxA = ‘11’, Gx = ‘0’
VREF = VDD, No Load
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
LSb
LSb
LSb
LSb
VRxB:VRxA = ‘00’, Gx = ‘0’
VDD = 5.5V, No Load
VDD = 1.8V, VREF = 1.0V
VRxB:VRxA = ‘10’, Gx = ‘0’, No Load
VDD = 1.8V, VREF = 1.0V
VRxB:VRxA = ‘11’, Gx = ‘0’, No Load
VRxB:VRxA = ‘01’, Gx = ‘0’
No Load
Offset Error
(see B.8 “Offset
Error Drift
EOSD
-15
±1.5
+15
mV VRxB:VRxA = ‘00’
Gx = ‘0’
No Load
(EOSD)”)
Offset Voltage
Temperature
Coefficient
VOSTC
—
±10
—
µV/°C
Note 2 This parameter is ensured by characterization.
2015 Microchip Technology Inc.
DS20005466A-page 9
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
DC
Characteristics VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
Gx = ‘0’, RL = 5 k from VOUT to GND, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym. Min.
EFS
Typ.
Max.
Units
Conditions
Full-Scale Error
(see
—
—
4.5
LSb 8-bit
Code = FFh, VRxB:VRxA = ‘11’
Gx = ‘0’, VREF = 2.048V, No Load
B.4 “Full-Scale
Error (EFS)”)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
LSb
LSb
LSb
Code = FFh, VRxB:VRxA = ‘10’
Gx = ‘0’, VREF = 2.048V, No Load
Code = FFh, VRxB:VRxA = ‘01’
Gx = ‘0’, VREF = 2.048V, No Load
Code = FFh, VRxB:VRxA = ‘00’
No Load
—
—
18
LSb 10-bit Code = 3FFh, VRxB:VRxA = ‘11’
Gx = ‘0’, VREF = 2.048V, No Load
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
LSb
LSb
LSb
Code = 3FFh, VRxB:VRxA = ‘10’
Gx = ‘0’, VREF = 2.048V, No Load
Code = 3FFh, VRxB:VRxA = ‘01’
Gx = ‘0’, VREF = 2.048V, No Load
Code = 3FFh, VRxB:VRxA = ‘00’
No Load
—
—
70
LSb 12-bit Code = FFFh, VRxB:VRxA = ‘11’
Gx = ‘0’, VREF = 2.048V, No Load
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
LSb
LSb
LSb
Code = FFFh, VRxB:VRxA = ‘10’
Gx = ‘0’, VREF = 2.048V, No Load
Code = FFFh, VRxB:VRxA = ‘01’
Gx = ‘0’, VREF = 2.048V, No Load
Code = FFFh, VRxB:VRxA = ‘00’
No Load
Note 2 This parameter is ensured by characterization.
DS20005466A-page 10
2015 Microchip Technology Inc.
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
DC Characteristics
Gx = ‘0’, RL = 5 k from VOUT to GND, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Gain Error
EG
-1.0
±0.1
+1.0
% of
FSR 8-bit
Code = 250, No Load
VRxB:VRxA = ‘00’
Gx = ‘0’
(see B.9 “Gain Error (EG)”) (8)
-1.0
-1.0
—
±0.1
±0.1
-3
+1.0
+1.0
—
% of
Code = 1000, No Load
FSR 10-bit VRxB:VRxA = ‘00’
Gx = ‘0’
% of
Code = 4000, No Load
FSR 12-bit VRxB:VRxA = ‘00’
Gx = ‘0’
Gain-Error Drift (see
B.10 “Gain-Error Drift
(EGD)”)
G/°C
ppm/°C
Note 8
This gain error does not include offset error.
2015 Microchip Technology Inc.
DS20005466A-page 11
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
DC Characteristics
Gx = ‘0’, RL = 5 k from VOUT to GND, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Integral
INL
-0.5
±0.1
+0.5
LSb 8-bit VRxB:VRxA = ‘10’ (codes: 6 to 250)
Nonlinearity
VDD = VREF = 5.5V
(see B.11 “Integral
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
LSb
LSb
LSb
LSb
VRxB:VRxA = ‘00’, ‘01’, ‘11’
Nonlinearity (INL)”) (10)
VRxB:VRxA = ‘01’
VDD = 5.5V, Gx = ‘1’
VRxB:VRxA = ‘10’, ‘11’
VREF = 1.0V, Gx = ‘1’
VDD = 1.8V
VREF = 1.0V
-1.5
±0.4
+1.5
LSb 10-bit VRxB:VRxA = ‘10’ (codes: 25 to
1000)
VDD = VREF = 5.5V
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
LSb
LSb
LSb
LSb
VRxB:VRxA = ‘00’, ‘01’, ‘11’
VRxB:VRxA = ‘01’
V
DD = 5.5V, Gx = ‘1’
VRxB:VRxA = ‘10’, ‘11’
REF = 1.0V, Gx = ‘1’
VDD = 1.8V
REF = 1.0V
V
V
-6
±1.5
+6
LSb 12-bit VRxB:VRxA = ‘10’ (codes: 100 to
4000)
VDD = VREF = 5.5V.
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
See Section 2.0, “Typical
Performance Curves” (2)
LSb
LSb
LSb
LSb
VRxB:VRxA = ‘00’, ‘01’, ‘11’
VRxB:VRxA = ‘01’
VDD = 5.5V, Gx = ‘1’
VRxB:VRxA = ‘10’, ‘11’
VREF = 1.0V, Gx = ‘1’
VDD = 1.8V
VREF = 1.0V
Note 2
This parameter is ensured by characterization.
Note 10
Code range dependent on resolution: 8-bit, codes 6 to 250; 10-bit, codes 25 to 1000; 12-bit, codes 100 to
4000.
DS20005466A-page 12
2015 Microchip Technology Inc.
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
DC Characteristics
Gx = ‘0’, RL = 5 k from VOUT to GND, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym.
Min.
Typ.
±0.0125 +0.25 LSb 8-bit VRxB:VRxA = ‘10’ (codes: 6 to 250)
DD = VREF = 5.5V
Max. Units
Conditions
Differential
Nonlinearity
(see
B.12 “Differential
Nonlinearity
(DNL)”)(10)
DNL
-0.25
V
See Section 2.0, “Typical LSb
Performance Curves” (2)
VRxB:VRxA = ‘00’, ‘01’, ‘11’
See Section 2.0, “Typical LSb
Performance Curves” (2)
VRxB:VRxA = ‘01’
V
DD = 5.5V, Gx = ‘1’
VRxB:VRxA = ‘10’, ‘11’
REF = 1.0V, Gx = ‘1’
VDD = 1.8V
See Section 2.0, “Typical LSb
Performance Curves” (2)
V
See Section 2.0, “Typical LSb
Performance Curves” (2)
-0.5
±0.05
+0.5
LSb 10-bit VRxB:VRxA = ‘10’ (codes: 25 to 1000)
DD = VREF = 5.5V
V
See Section 2.0, “Typical LSb
Performance Curves” (2)
VRxB:VRxA = ‘00’, ‘01’, ‘11’
See Section 2.0, “Typical LSb
Performance Curves” (2)
VRxB:VRxA = ‘01’
V
DD = 5.5V, Gx = ‘1’
VRxB:VRxA = ‘10’, ‘11’
REF = 1.0V, Gx = ‘1’
VDD = 1.8V
See Section 2.0, “Typical LSb
Performance Curves” (2)
V
See Section 2.0, “Typical LSb
Performance Curves” (2)
-1.0
±0.2
+1.0
LSb 12-bit VRxB:VRxA = ‘10’ (codes: 100 to 4000)
DD = VREF = 5.5V
V
See Section 2.0, “Typical LSb
Performance Curves” (2)
VRxB:VRxA = ‘00’, ‘01’, ‘11’
See Section 2.0, “Typical LSb
Performance Curves” (2)
VRxB:VRxA = ‘01’
V
DD = 5.5V, Gx = ‘1’
VRxB:VRxA = ‘10’, ‘11’
REF = 1.0V, Gx = ‘1’
VDD = 1.8V
See Section 2.0, “Typical LSb
Performance Curves” (2)
V
See Section 2.0, “Typical LSb
Performance Curves” (2)
Note 2
This parameter is ensured by characterization.
Note 10
Code range dependent on resolution: 8-bit, codes 6 to 250; 10-bit, codes 25 to 1000; 12-bit, codes 100
to 4000.
2015 Microchip Technology Inc.
DS20005466A-page 13
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
DC Characteristics
Gx = ‘0’, RL = 5 k from VOUT to GND, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
VREF = 2.048V ± 0.1V
VRxB:VRxA = ‘10’, Gx = ‘0’
-3 dB Bandwidth
(see B.16 “-3 dB
Bandwidth”)
BW
—
200
—
kHz
—
100
—
kHz
VREF = 2.048V ± 0.1V
VRxB:VRxA = ‘10’, Gx = ‘1’
Output Amplifier
Minimum Output
Voltage
VOUT(MIN)
VOUT(MAX)
PM
—
—
—
0.01
—
—
—
V
V
1.8V VDD 5.5V
Output Amplifier’s minimum drive
Maximum Output
Voltage
VDD
–
1.8V VDD 5.5V
Output Amplifier’s maximum drive
0.04
Phase Margin
66
Degree
(°)
C = 400 pF
L
R =
L
Slew Rate (9)
SR
ISC
—
3
0.44
9
—
V/µs RL = 5 k
Short-Circuit Current
Internal Band Gap
Band Gap Voltage
14
mA
DAC code = Full Scale
VBG
1.18
—
1.22
15
1.26
—
V
Band Gap Voltage
Temperature
Coefficient
VBGTC
ppm/°C
Operating Range
2.0
2.2
—
—
5.5
5.5
V
V
V
V
REF pin voltage stable
OUT output linear
(VDD
)
External Reference (VREF
)
Input Range (1)
VREF
VSS
VSS
—
—
—
1
VDD – 0.04
V
V
VRxB:VRxA = ‘11’ (Buffered mode)
VRxB:VRxA = ‘10’ (Unbuffered mode)
VRxB:VRxA = ‘10’ (Unbuffered mode)
VDD
—
Input Capacitance
Total Harmonic
Distortion (1)
CREF
THD
pF
dB
—
-64
—
VREF = 2.048V ± 0.1V
VRxB:VRxA = ‘10’, Gx = ‘0’
Frequency = 1 kHz
Dynamic Performance
Major Code
—
—
45
—
—
nV-s
nV-s
1 LSb change around major carry
7FFh to 800h for 12-bit devices
1FFh to 200h for 10-bit devices
7Fh to 80h for 8-bit devices
Transition Glitch (see
B.14 “Major-Code
Transition Glitch”)
Digital Feedthrough
(see B.15 “Digital
Feedthrough”)
<10
Note 1
Note 9
This parameter is ensured by design.
Within 1/2 LSb of final value when code changes from 1/4 to 3/4 of FSR. (Example: 400h to C00h in 12-bit
device).
DS20005466A-page 14
2015 Microchip Technology Inc.
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
Gx = ‘0’, RL = 5 k from VOUT to GND, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
DC Characteristics
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Digital Inputs/Outputs (CS, SCK, SDI, SDO, LAT0/HVC)
Schmitt Trigger
High-Input Threshold
VIH
0.45 VDD
0.5 VDD
—
—
—
—
—
—
V
V
V
2.7V VDD 5.5V
1.8V VDD 2.7V
Schmitt Trigger
Low-Input Threshold
VIL
VHYS
VOL
0.2 VDD
Hysteresis of Schmitt
Trigger Inputs
—
0.1 VDD
—
V
Output Low Voltage
VSS
VSS
—
—
—
—
—
10
0.3 VDD
0.3 VDD
VDD
VDD
1
V
V
V
V
IOL = 5 mA, VDD = 5.5V
IOL = 1 mA, VDD = 1.8V
IOH = -2.5 mA, VDD = 5.5V
IOH = -1 mA, VDD = 1.8V
Output High Voltage
VOH
0.7VDD
0.7VDD
-1
Input Leakage Current
Pin Capacitance
IIL
µA VIN = VDD and VIN = VSS
pF fC = 20 MHz
CIN, COUT
—
—
2015 Microchip Technology Inc.
DS20005466A-page 15
MCP48FVBXX
DC CHARACTERISTICS (CONTINUED)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
VDD = +2.7V to 5.5V, VREF = +2.048V to VDD, VSS = 0V
DC Characteristics
Gx = ‘0’, RL = 5 k from VOUT to GND, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
RAM Value
Value Range
N
0h
0h
0h
—
FFh
3FFh
FFFh
hex
hex
hex
hex
hex
hex
hex
8-bit
—
10-bit
12-bit
8-bit
—
DAC Register
POR/BOR Value
N
See Table 4-2
See Table 4-2
See Table 4-2
See Table 4-2
10-bit
12-bit
PDCON Initial
Factory Setting
Power Requirements
Power Supply Sensitivity
(see
B.17 “Power-Supply
Sensitivity (PSS)”)
PSS
—
—
—
0.002
0.002
0.002
0.005
0.005
0.005
%/%
%/%
%/%
8-bit
Code = 7Fh
10-bit Code = 1FFh
12-bit Code = 7FFh
DS20005466A-page 16
2015 Microchip Technology Inc.
MCP48FVBXX
DC Notes:
1. This parameter is ensured by design.
2. This parameter is ensured by characterization.
3. POR/BOR voltage trip point is not slope dependent. Hysteresis implemented with time delay.
4. Supply current is independent of current through the resistor ladder in mode VRxB:VRxA = ‘10’.
5. The PDxB:PDxA = ‘01’, ‘10’, and ‘11’ configurations should have the same current.
6. By design, this is the worst-case current mode.
7. Resistance is defined as the resistance between the VREF pin (mode VRxB:VRxA = ‘10’) to VSS pin. For
dual-channel devices (MCP48FVBX2), this is the effective resistance of the each resistor ladder. The resistance
measurement is that of the two resistor ladders measured in parallel.
8. This gain error does not include offset error.
9. Within 1/2 LSb of final value when code changes from 1/4 to 3/4 of FSR. (Example: 400h to C00h in 12-bit device).
10. Code range dependent on resolution: 8-bit, codes 6 to 250; 10-bit, codes 25 to 1000; 12-bit, codes 100 to 4000.
11. Variation of one output voltage to mean output voltage.
2015 Microchip Technology Inc.
DS20005466A-page 17
MCP48FVBXX
1.1
Reset, Power-Down, and SPI Mode Timing Waveforms and Requirements
VPOR (VBOR
tBORD
)
VDD
tPORD
VOUT at High Z
VOUT
SPI Interface is operational
Power-on and Brown-out Reset Waveforms.
FIGURE 1-1:
24th bit
(Write
1st bit
(Next
24th bit
(Write
command) command)
command)
SCK
tPDE
tPDD
VOUT
FIGURE 1-2:
SPI Power-Down Command Waveforms.
TABLE 1-1:
RESET AND POWER-DOWN TIMING
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
Timing
Characteristics
VDD = +1.8V to 5.5V, VSS = 0V
RL = 5 k from VOUT to VSS, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym. Min. Typ. Max. Units
Conditions
Power-on Reset Delay tPORD
Brown-out Reset Delay tBORD
—
—
60
45
—
—
µs
µs VDD transitions from VDD(MIN) > VPOR
VOUT driven to VOUT disabled
Power-Down Output
Disable Time Delay
TPDD
—
10.5
—
µs PDxB:PDxA = ‘11’, ‘10’, or ‘01’ “00” started from
falling edge of the SCK at the end of the 24th clock cycle.
Volatile DAC Register = FFh, VOUT = 10 mV
VOUT not connected
Power-Down Output
Enable Time Delay
TPDE
—
1
—
µs PDxB:PDxA = “00” ‘11’, ‘10’, or ‘01’ started from
falling edge of the SCK at the end of the 24th clock cycle
VOUT = VOUT - 10 mV. VOUT not connected
DS20005466A-page 18
2015 Microchip Technology Inc.
MCP48FVBXX
± 0.5 LSb
New Value
Old Value
V
OUT
FIGURE 1-3:
VOUT Settling Time Waveform.
TABLE 1-2:
VOUT SETTLING TIMING
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40°C TA +125°C (Extended)
Unless otherwise noted, all parameters apply across these specified operating ranges:
VDD = +1.8V to 5.5V, VSS = 0V
Timing
Characteristics
RL = 5 k from VOUT to VSS, CL = 100 pF
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym. Min. Typ. Max. Units
Conditions
Code = 40h C0h; C0h 40h (3)
Code = 100h 300h; 300h 100h (3)
Code = 400h C00h; C00h 400h (3)
V
OUT Settling Time
tS
—
—
—
7.8
7.8
7.8
—
—
—
µs
µs
µs
8-bit
(±0.5LSb error band,
CL = 100 pF)
(see B.13 “Settling
Time”)
10-bit
12-bit
Note 3 Within 1/2 LSb of final value when code changes from 1/4 to 3/4 of FSR. (Example: 400h to C00h in 12-bit
device).
2015 Microchip Technology Inc.
DS20005466A-page 19
MCP48FVBXX
V
IHH
V
V
V
1
)
(
IH
IH
HVC
CS
98
V
97
IH
IH
V
IL
84
96
“1”
“0”
96
“1”
“0”
LAT
94
70
72
SCK
83
71
80
MSb
LSb
SDO
SDI
BIT6 - - - - - -1
BIT6 - - - -1
73
74
77
MSb IN
LSb IN
Note 1: The HVC pin is for signal voltage compatibility with MCP48FEBXX devices.
FIGURE 1-4:
SPI Timing (Mode = 11) Waveforms.
V
IHH
1
(
)
V
V
98
97
IH
HVC
CS
IH
IH
V
V
IH
82
V
IL
84
96
“1”
“0”
“1”
“0”
96
LAT
94
70
83
SCK
80
71
72
MSb
74
BIT6 - - - - - -1
BIT6 - - - -1
LSb
SDO
SDI
73
77
MSb IN
LSb IN
Note 1: The HVC pin is for signal voltage compatibility with MCP48FEBXX devices.
FIGURE 1-5:
SPI Timing (Mode = 00) Waveforms.
DS20005466A-page 20
2015 Microchip Technology Inc.
MCP48FVBXX
TABLE 1-3:
SPI REQUIREMENTS (MODE = 11)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40C TA +125C (Extended)
Operating Voltage range is described in DC Characteristics.
SPI AC
Characteristics
Param.
Sym.
No.
Characteristic
SCK input frequency
Min. Max. Units
Conditions
FSCK
—
—
—
10
20
MHz VDD = 2.7V to 5.5V
(Read command)
MHz VDD = 2.7V to 5.5V
(All other commands)
1
MHz
ns
V
DD = 1.8V to 2.7V
70
71
TcsA2scH CS Active (VIL) to command’s 1st SCK input 60
—
—
—
—
—
TscH
SCK input high time
20
400
20
ns
V
DD = 2.7V to 5.5V
ns VDD = 1.8V to 2.7V
ns DD = 2.7V to 5.5V
72
TscL
SCK input low time
V
400
ns VDD = 1.8V to 2.7V
73
74
77
80
TdiV2scH Setup time of SDI input to SCK edge
TscH2diL Hold time of SDI input from SCK edge
TcsH2DOZ CS Inactive (VIH) to SDO output hi-impedance
TscL2doV SDO data output valid after SCK edge
10
20
—
—
—
—
50
45
ns
ns
ns Note 1
ns VDD = 2.7V to 5.5V
—
100
1
170
—
ns
VDD = 1.8V to 2.7V
83
TscH2csL CS Inactive (VIH) after SCK edge
ns VDD = 2.7V to 5.5V
µs
VDD = 1.8V to 2.7V
84
94
TcsH
CS high time (VIH)
50
—
—
ns
ns
Write Data transferred (4)
TLATSU LAT to SCK↑ (write data 24th bit) setup time 20
96
97
TLAT
LAT high or low time
20
0
—
—
ns
ns
High-Voltage Commands (1)
(MCP48FEBxx only)
THVCSU
HVC to SCK (1st data bit)
(HVC setup time)
High-Voltage Commands (1)
(MCP48FEBxx only)
98
THVCHD
SCK ↑ (last bit of command (8th or 24th bit))
to HVC (HVC hold time)
25
—
ns
Note 1 This parameter is ensured by design.
Note 4 The transition of the LAT signal must occur 10 ns before the rising edge of the 24th SCK signal (Spec 94) or
the current register data value may not be transferred to the output latch (VOUT) before the register is
overwritten with the new value.
2015 Microchip Technology Inc.
DS20005466A-page 21
MCP48FVBXX
TABLE 1-4:
SPI REQUIREMENTS (MODE = 00)
Standard Operating Conditions (unless otherwise specified):
Operating Temperature: -40C TA +125C (Extended)
Operating Voltage range is described in DC Characteristics.
SPI AC
Characteristics
Param.
Sym.
No.
Characteristic
SCK input frequency
Min. Max. Units
Conditions
FSCK
—
—
10
20
MHz VDD = 2.7V to 5.5V
(Read command)
MHz VDD = 2.7V to 5.5V
(All other commands)
—
60
1
MHz
ns
V
DD = 1.8V to 2.7V
70
71
TcsA2scH CS Active (VIL) to SCK input
—
—
—
—
—
TscH
SCK input high time
20
ns
V
DD = 2.7V to 5.5V
400
20
ns VDD = 1.8V to 2.7V
ns DD = 2.7V to 5.5V
72
TscL
SCK input low time
V
400
ns VDD = 1.8V to 2.7V
73
74
77
TDIV2scH Setup time of SDI input to SCK edge
TscH2DIL Hold time of SDI input from SCK edge
TcsH2DOZ CS Inactive (VIH) to SDO output hi-impedance
10
20
—
—
—
50
ns
ns
ns Note 1
80
TscL2DOV SDO data output valid after SCK edge
—
—
—
45
170
70
ns VDD = 2.7V to 5.5V
ns
ns
VDD = 1.8V to 2.7V
82
83
TssL2doV SDO data output valid after
CS Active (VIL)
TscH2csL CS Inactive (VIH) after SCK edge
100
1
—
ns VDD = 2.7V to 5.5V
µs
ns
ns
VDD = 1.8V to 2.7V
84
94
TcsH
CS high time (VIH)
50
10
—
—
Write Data transferred (4)
TLATSU
LAT to SCK↑ (write data 24th bit) setup time
96
97
TLAT
LAT high or low time
50
0
—
—
ns
THVCSU HVC to SCK (1st data bit)
ns High-Voltage
Commands (1)
(HVC setup time)
(MCP48FEBXX only)
98
THVCHD SCK (last bit of command (8th or 24th bit)) to
HVC (HVC hold time)
25
—
ns High-Voltage
Commands (1)
(MCP48FEBXX only)
Note 1 This parameter is ensured by design.
Note 4 The transition of the LAT signal must occur 10 ns before the rising edge of the 24th SCK signal (Spec 94) or
the current register data value may not be transferred to the output latch (VOUT) before the register is
overwritten with the new value.
DS20005466A-page 22
2015 Microchip Technology Inc.
MCP48FVBXX
Timing Table Notes:
1. This parameter is ensured by design.
2. This parameter ensured by characterization.
3. Within 1/2 LSb of final value when code changes from 1/4 to 3/4 of FSR. (Example: 400h to C00h in 12-bit device).
4. The transition of the LAT signal must occur 10 ns before the rising edge of the 24th SCK signal (Spec 94) or the
current register data value may not be transferred to the output latch (VOUT) before the register is overwritten with
the new value.
2015 Microchip Technology Inc.
DS20005466A-page 23
MCP48FVBXX
Temperature Specifications
Electrical Specifications: Unless otherwise indicated, VDD = +2.7V to +5.5V, VSS = GND.
Parameters
Temperature Ranges
Sym.
Min.
Typ.
Max. Units
Conditions
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 10LD-MSOP
TA
TA
TA
-40
-40
-65
—
—
—
+125
+125
+150
°C
°C
°C
Note 1
JA
—
202
—
°C/W
Note 1: The MCP48FVBXX devices operate over this extended temperature range, but with reduced performance.
Operation in this range must not cause TJ to exceed the Maximum Junction Temperature of +150°C.
DS20005466A-page 24
2015 Microchip Technology Inc.
MCP48FVBXX
2.0
TYPICAL PERFORMANCE CURVES
Note:
The device Performance Curves are available in a separate document. This is done to keep the file size of
this PDF document less than the 10 MB file attachment limit of many mail servers.
The MCP48FXBXX Performance Curves document is literature number DS20005440, and can be found
on the Microchip website. Look on the MCP48FVBXX product page under “Documentation and Software”,
in the Data Sheets category.
2015 Microchip Technology Inc.
DS20005466A-page 25
MCP48FVBXX
NOTES:
DS20005466A-page 26
2015 Microchip Technology Inc.
MCP48FVBXX
3.0
PIN DESCRIPTIONS
Overviews of the pin functions are provided in
Sections 3.1, “Positive Power Supply Input (VDD)”
through 3.10, “SPI - Serial Clock Pin (SCK)”. The
descriptions of the pins for the single-DAC output
device are listed in Table 3-1, and descriptions for the
dual-DAC output device are listed in Table 3-2.
TABLE 3-1:
MCP48FVBX1 (SINGLE-DAC) PINOUT DESCRIPTION
Pin
Buffer
Type
MSOP-10LD
Symbol
I/O
Standard Function
1
VDD
—
P
Supply Voltage Pin
SPI Chip Select Pin
2
3
CS
I
ST
VREF0
A
Analog Voltage Reference Input Pin
Analog Buffered Analog Voltage Output Pin
Not Internally Connected
4
VOUT0
A
5
6
NC
—
I
—
LAT0/HVC
HV ST DAC Register Latch/High-Voltage Command Pin.
Latch Pin allows the value in the Serial Shift Register to transfer to the
volatile DAC register.
(The HVC signal is present to indicate voltage level compatibility with
the nonvolatile device family (MCP48FEBXX)).
7
VSS
—
P
Ground Reference Pin for all circuitries on the device
8
9
SDO
SCK
SDI
O
I
—
ST
ST
SPI Serial Data Output Pin
SPI Serial Clock Pin
10
I
SPI Serial Data Input Pin
Legend:
A = Analog
I = Input
ST = Schmitt Trigger HV = High Voltage
O = Output I/O = Input/Output
P = Power
TABLE 3-2:
MCP48FVBX2 (DUAL-DAC) PINOUT DESCRIPTION
Pin
Buffer
Type
MSOP-10LD Symbol
I/O
Standard Function
1
VDD
—
P
Supply Voltage Pin
SPI Chip Select Pin
2
3
CS
I
ST
VREF
A
Analog Voltage Reference Input Pin (for DAC0 and DAC1)
Analog Buffered Analog Voltage Output 0 Pin
Analog Buffered Analog Voltage Output 1 Pin
4
5
6
VOUT0
VOUT1
A
A
I
LAT/HVC
HV ST DAC Register Latch/High-Voltage Command Pin.
Latch Pin allows the value in the Serial Shift Register to transfer to the
volatile DAC register (for DAC0 and DAC1).
(The HVC signal is present to indicate voltage level compatibility with
the nonvolatile device family (MCP48FEBXX)).
7
VSS
—
P
Ground Reference Pin for all circuitries on the device
8
9
SDO
SCK
SDI
O
I
—
ST
ST
SPI Serial Data Output Pin
SPI Serial Clock Pin
10
I
SPI Serial Data Input Pin
Legend:
A = Analog
I = Input
ST = Schmitt Trigger HV = High Voltage
O = Output I/O = Input/Output
P = Power
2015 Microchip Technology Inc.
DS20005466A-page 27
MCP48FVBXX
3.1
Positive Power Supply Input (V
)
3.4
No Connect (NC)
DD
VDD is the positive supply voltage input pin. The input
supply voltage is relative to VSS
The power supply at the VDD pin should be as clean as
possible for good DAC performance. It is
The NC pin is not connected to the device.
.
3.5
Ground (V
)
SS
a
The VSS pin is the device ground reference.
recommended to use an appropriate bypass capacitor
of about 0.1 µF (ceramic) to ground. An additional
10 µF capacitor (tantalum) in parallel is also
recommended to further attenuate noise present in
application boards.
The user must connect the VSS pin to a ground plane
through a low-impedance connection. If an analog
ground path is available in the application PCB (printed
circuit board), it is highly recommended that the VSS pin
be tied to the analog ground path or isolated within an
analog ground plane of the circuit board.
3.2
Voltage Reference Pin (V
)
REF
The VREF pin is either an input or an output. When the
DAC’s voltage reference is configured as the VREF pin,
the pin is an input. When the DAC’s voltage reference is
configured as the internal band gap, the pin is an output.
3.6
Latch Pin (LAT)/High-Voltage
Command (HVC)
The LAT pin is used to force the transfer of the DAC
register’s shift register to the DAC output register. This
allows DAC outputs to be updated at the same time.
When the DAC’s voltage reference is configured as the
VREF pin, there are two options for this voltage input:
The update of the VRxB:VRxA, PDxB:PDxA and
Gx bits are also controlled by the LAT pin state.
• VREF pin voltage buffered
• VREF pin voltage unbuffered
The pin is compatible with HVC voltage levels that are
used for the nonvolatile MCP48FEBXX devices.
The buffered option is offered in cases where the
external reference voltage does not have sufficient
current capability to not drop its voltage when
connected to the internal resistor ladder circuit.
3.7
SPI - Chip Select Pin (CS)
The CS pin enables/disables the serial interface. The
serial interface must be enabled for the SPI commands
to be received by the device.
When the DAC’s voltage reference is configured as the
device VDD, the VREF pin is disconnected from the
internal circuit.
Refer to Section 6.2, “SPI Serial Interface” for more
details of SPI Serial Interface communication.
When the DAC’s voltage reference is configured as the
internal band gap, the VREF pin’s drive capability is
minimal, so the output signal should be buffered.
3.8
SPI - Serial Data In Pin (SDI)
See Section 5.2, “Voltage Reference Selection” and
Register 4-2 for more details on the configuration bits.
The SDI pin is the serial data input pin of the SPI
interface. The SDI pin is used to write the DAC
registers and configuration bits.
3.3
Analog Output Voltage Pin (V
)
OUT
Refer to Section 6.2, “SPI Serial Interface” for more
details on SPI Serial Interface communication.
VOUT is the DAC analog voltage output pin. The DAC
output has an output amplifier. The DAC output range is
dependent on the selection of the voltage reference
source (and potential Output Gain selection). These are:
3.9
SPI - Serial Data Out Pin (SDO)
• Device VDD - The full-scale range of the DAC
The SDO pin is the serial data output pin of the SPI
interface. The SDO pin is used to read the DAC
registers and configuration bits.
output is from VSS to approximately VDD
.
• VREF pin - The full-scale range of the DAC output
is from VSS to G VRL, where G is the gain
selection option (1x or 2x).
Refer to Section 6.2, “SPI Serial Interface” for more
details on SPI Serial Interface communication.
• Internal Band Gap - The full-scale range of the
DAC output is from VSS to G (2 VBG), where G
is the gain selection option (1x or 2x).
3.10 SPI - Serial Clock Pin (SCK)
The SCK pin is the serial clock pin of the SPI interface.
The MCP48FVBXX SPI Interface only accepts external
serial clocks.
In Normal mode, the DC impedance of the output pin is
about 1. In Power-Down mode, the output pin is
internally connected to a known pull-down resistor of
1 k, 100 k, or open. The Power-Down Selection bits
settings are shown in Register 4-3 and Table 5-5.
Refer to Section 6.2, “SPI Serial Interface” for more
details on SPI Serial Interface communication.
DS20005466A-page 28
2015 Microchip Technology Inc.
MCP48FVBXX
4.1
Power-on Reset/Brown-out Reset
(POR/BOR)
4.0
GENERAL DESCRIPTION
The MCP48FVBX1 (MCP48FVB01, MCP48FVB11,
and MCP48FVB21) devices are single-channel voltage
output devices. The MCP48FVBX2 (MCP48FVB02,
MCP48FVB12, and MCP48FVB22) devices are
dual-channel voltage output devices.
The internal Power-on Reset (POR)/Brown-out Reset
(BOR) circuit monitors the power supply voltage (VDD
)
during operation. This circuit ensures correct device
start-up at system power-up and power-down events.
The device’s RAM retention voltage (VRAM) is lower
than the POR/BOR voltage trip point (VPOR/VBOR).
The maximum VPOR/VBOR voltage is less than 1.8V.
These devices are offered with 8-bit (MCP48FVB0X),
10-bit (MCP48FVB1X) and 12-bit (MCP48FVB2X)
resolution and include volatile memory, an SPI serial
interface and a write latch (LAT) pin to control the
update of the written DAC value to the DAC output pin.
POR occurs as the voltage is rising (typically from 0V),
while BOR occurs as the voltage is falling (typically
from VDD(MIN) or higher).
The devices use a resistor ladder architecture. The
resistor
ladder
DAC
is
driven
from
a
The POR and BOR trip points are at the same voltage,
and the condition is determined by whether the
VDD voltage is rising or falling (see Figure 4-1). What
occurs is different depending on whether the reset is a
POR or a BOR.
software-selectable voltage reference source. The
source can be either the device’s internal VDD, an
external VREF pin voltage (buffered or unbuffered) or
an internal band gap voltage source.
The DAC output is buffered with a low-power,
precision output amplifier (op amp). This output
amplifier provides a rail-to-rail output with low offset
voltage and low noise. The gain (1x or 2x) of the
output buffer is software configurable.
When
VPOR/VBOR < VDD < 2.7V,
the
electrical
performance may not meet the data sheet
specifications. In this region, the device is capable of
reading and writing to its volatile memory if the proper
serial command is executed.
The devices operate from a single supply voltage. This
voltage is specified from 2.7V to 5.5V for full specified
operation, and from 1.8V to 5.5V for digital operation.
The devices operate between 1.8V and 2.7V, but
some device parameters are not specified.
The main functional blocks are:
• Power-on Reset/Brown-out Reset (POR/BOR)
• Device Memory
• Resistor Ladder
• Output Buffer/VOUT Operation
• Internal Band Gap (as a voltage reference)
• SPI Serial Interface Module
2015 Microchip Technology Inc.
DS20005466A-page 29
MCP48FVBXX
4.1.1
POWER-ON RESET
4.1.2
BROWN-OUT RESET
The Power-on Reset is the case where the device VDD
is having power applied to it from the VSS voltage level.
As the device powers up, the VOUT pin will float to an
unknown value. When the device’s VDD is above the
transistor threshold voltage of the device, the output
will start being pulled low. After the VDD is above the
POR/BOR trip point (VBOR/VPOR), the resistor
network’s wiper will be loaded with the POR value
(mid-scale). The volatile memory determines the
analog output (VOUT) pin voltage. After the device is
powered-up, the user can update the device memory.
The Brown-out Reset occurs when a device had
power applied to it and that power (voltage) drops
below the specified range.
When the falling VDD voltage crosses the VPOR trip
point (BOR event), the following occurs:
• Serial Interface is disabled
• Device is forced into a Power-Down state
(PDxB:PDxA = ‘11’). Analog circuitry is turned off
• Volatile DAC Register is forced to 000h
• Volatile configuration bits VRxB:VRxA and Gx are
forced to ‘0’
When the rising VDD voltage crosses the VPOR trip
point (a Power-on Reset event), the following occurs:
If the VDD voltage decreases below the VRAM voltage,
all volatile memory may become corrupted.
• The default DAC register value is latched into
volatile DAC register
As the voltage recovers above the VPOR/VBOR voltage,
• The default configuration bit values are latched
into volatile configuration bits
see Section 4.1.1, “Power-on Reset”.
Serial commands not completed due to a brown-out
condition may cause the memory location to become
corrupted.
• POR Status bit is set (‘1’)
• The Reset Delay Timer (tPORD) starts; when the
reset delay timer (tPORD) times out, the SPI serial
interface is operational. During this delay time, the
SPI interface will not accept commands.
Figure 4-1 illustrates the conditions for power-up and
power-down events under typical conditions.
• The Device Memory Address pointer is forced to
00h.
The analog output (VOUT) state will be determined by
the state of the volatile configuration bits and the DAC
register.
Figure 4-1 illustrates the conditions for power-up and
power-down events under typical conditions.
Volatile memory
POR starts Reset Delay Timer.
Volatile memory
retains data value When timer times out, SPI interface
becomes corrupted
can operate (if VDD VDD(MIN)
)
VDD(MIN)
TPORD (50 µs max.)
VPOR
VRAM
VBOR
Normal Operation
Device in
unknown
state
Device in
POR state
Below
Device Device in
minimum in power unknown
operating -down state
voltage state
Default device configuration latched
into volatile configuration bits and
POR reset forced active DAC register. POR status bit is set.
BOR reset,
volatile DAC Register = 000h
volatile VRxB:VRxA = 00
volatile Gx = 0
volatile PDxB:PDxA = 11
FIGURE 4-1:
Power-on Reset Operation.
DS20005466A-page 30
2015 Microchip Technology Inc.
MCP48FVBXX
4.2.1
VOLATILE REGISTER MEMORY
(RAM)
4.2
Device Memory
User memory includes two types of memory:
There are up to five volatile memory locations:
• Volatile Register Memory (RAM)
• Device Configuration Memory
• DAC0 and DAC1 Output Value Registers
• VREF Select Register
Each memory address is 16 bits wide.The memory
mapped register space is shown in Table 4-1. (see
Section 4.2.2, “Device Configuration Memory”).
• Power-Down Configuration Register
• Gain and Status Register
The volatile memory starts functioning when the
device VDD is at (or above) the RAM retention voltage
(VRAM). The volatile memory will be loaded with the
default device values when the VDD rises across the
VPOR/VBOR voltage trip point.
TABLE 4-1:
MEMORY MAP (X16)
Function
Function
1 2
( ,
)
)
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
Volatile DAC0 Register
Volatile DAC1 Register
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
1Bh
1Ch
1Dh
1Eh
1Fh
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1 2
( ,
(1)
(1)
(1, 2)
(1, 2)
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1
( )
1 2
( ,
)
)
1
( )
1 2
( ,
(1)
(1, 2)
1
( )
1 2
( ,
)
)
1 2
( ,
V
Register
REF
(1, 2)
(1, 2)
Power-Down Register
Gain and Status Register
1
1 2
( ,
( )
)
)
Reserved
Reserved
Reserved
Reserved
Reserved
1
( )
1 2
( ,
(1)
(1, 2)
1
( )
1 2
( ,
)
)
1
( )
1 2
( ,
Volatile Memory address range
Nonvolatile Memory address range
Note 1: Reading a reserved memory location will result in the SPI command Command Error condition. The SDO
pin will output all ‘0’s. Forcing the CS pin to the VIH state will reset the SPI interface.
2: Nonvolatile memory address range is shown to reflect memory map compatibility with the MCP48FEBXX
family of devices.
2015 Microchip Technology Inc.
DS20005466A-page 31
MCP48FVBXX
4.2.2
DEVICE CONFIGURATION
MEMORY
4.2.4
UNIMPLEMENTED (RESERVED)
LOCATIONS
The STATUS register is described in Register 4-4.
Normal (voltage) commands (read or write) to any
unimplemented memory address (reserved) will result
in a command error condition (CMDERR). Read
commands of a reserved location will read bits as ‘1’.
4.2.3
Read commands of
unimplemented bits as ‘0’.
UNIMPLEMENTED REGISTER BITS
a
valid location will read
4.2.4.1
Default Factory POR Memory State
Table 4-2 shows the default factory POR initialization
of the device memory map for the 8-, 10- and 12-bit
devices.
TABLE 4-2:
FACTORY DEFAULT POR / BOR VALUES
POR/BOR Value
POR/BOR Value
Function
Function
1 2
( ,
)
)
00h Volatile DAC0 Register
01h Volatile DAC1 Register
7Fh
7Fh
FFh
FFh
FFh
FFh
FFh
FFh
1FFh 7FFh
1FFh 7FFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
1Bh
1Ch
1Dh
1Eh
1Fh
FFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1 2
( ,
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
(1)
(1, 2)
02h
03h
04h
05h
06h
07h
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1
( )
1 2
( ,
)
)
1
( )
1 2
( ,
(1)
(1)
(1, 2)
(1, 2)
1
( )
1 2
( ,
)
)
1 2
( ,
08h V
Register
0000h 0000h 0000h
0000h 0000h 0000h
0080h 0080h 0080h
REF
(1, 2)
09h Power-Down Register
1 2
( ,
)
)
0Ah Gain and Status Register
1
1 2
( ,
( )
0Bh
0Ch
0Dh
0Eh
0Fh
FFh
FFh
FFh
FFh
FFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
3FFh FFFh
Reserved
Reserved
Reserved
Reserved
(1)
(1)
(1, 2)
(1, 2)
1
( )
1 2
( ,
)
)
1
( )
1 2
( ,
Reserved
Reserved
Volatile Memory address range
Nonvolatile Memory address range
Note 1: Reading a reserved memory location will result in the SPI command Command Error condition. The SDO
pin will output all ‘0’s. Forcing the CS pin to the VIH state will reset the SPI interface.
2: Nonvolatile memory address range is shown to reflect memory map compatibility with the MCP48FEBXX
family of devices.
DS20005466A-page 32
2015 Microchip Technology Inc.
MCP48FVBXX
4.2.5
DEVICE REGISTERS
Register 4-1 shows the format of the DAC Output Value
registers. These registers will be either 8 bits, 10 bits,
or 12 bits wide. The values are right justified.
REGISTER 4-1:
DAC0 AND DAC1 REGISTERS
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
U-0
—
U-0
—
U-0
—
U-0
—
12-bit
10-bit
8-bit
D11 D10 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00
(1)
(1)
(1)
(1)
—
—
—
—
—
—
—
—
D09 D08 D07 D06 D05 D04 D03 D02 D01 D00
(1)
(1)
—
—
—
—
—
—
D07 D06 D05 D04 D03 D02 D01 D00
bit 0
bit 15
Legend:
R = Readable bit
-n = Value at POR
= 12-bit device
W = Writable bit
‘1’ = Bit is set
= 10-bit device
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
= 8-bit device
12-bit
10-bit
8-bit
bit 15-12 bit 15-10 bit 15-8 Unimplemented: Read as ‘0’
bit 11-0
—
—
—
D11-D00: DAC Output value - 12-bit devices
FFFh =Full-Scale output value
7FFh =Mid-Scale output value
000h =Zero-Scale output value
bit 9-0
—
—
D09-D00: DAC Output value - 10-bit devices
3FFh =Full-Scale output value
1FFh =Mid-Scale output value
000h =Zero-Scale output value
—
bit 7-0
D07-D00: DAC Output value - 8-bit devices
FFh =Full-Scale output value
7Fh =Mid-Scale output value
000h =Zero-Scale output value
Note 1: Unimplemented bit, read as ‘0’.
2015 Microchip Technology Inc.
DS20005466A-page 33
MCP48FVBXX
Register 4-2 shows the format of the Voltage
Reference Control Register. Each DAC has two bits to
control the source of the voltage reference of the DAC.
REGISTER 4-2:
VOLTAGE REFERENCE (VREF) CONTROL REGISTER (ADDRESS 08h)
R/W-0 R/W-0 R/W-0 R/W-0
(1) (1)
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
Single
Dual
—
—
VR0B VR0A
—
—
—
—
—
—
—
—
—
—
—
—
VR1B VR1A VR0B VR0A
bit 0
bit 15
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
= Single-channel device
= Dual-channel device
Single
bit 15-2 bit 15-4 Unimplemented: Read as ‘0’
bit 1-0 bit 3-0 VRxB-VRxA: DAC Voltage Reference Control bits
Dual
11=VREF pin (Buffered); VREF buffer enabled
10=VREF pin (Unbuffered); VREF buffer disabled
01=Internal Band Gap (1.22V typical); VREF buffer enabled
VREF voltage driven when powered-down
00=VDD (Unbuffered); VREF buffer disabled.
Use this state with Power-Down bits for lowest current.
Note 1: Unimplemented bit, read as ‘0’.
DS20005466A-page 34
2015 Microchip Technology Inc.
MCP48FVBXX
Register 4-3 shows the format of the Power-Down
Control Register. Each DAC has two bits to control the
Power-Down state of the DAC.
REGISTER 4-3:
POWER-DOWN CONTROL REGISTER (ADDRESS 09h)
R/W-0 R/W-0 R/W-0 R/W-0
(1) (1)
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
Single
Dual
—
—
PD0B PD0A
—
—
—
—
—
—
—
—
—
—
—
—
PD1B PD1A PD0B PD0A
bit 0
bit 15
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
= Single-channel device
= Dual-channel device
Single
bit 15-2 bit 15-4 Unimplemented: Read as ‘0’
bit 1-0 bit 3-0
PDxB-PDxA: DAC Power-Down Control bits (2)
11=Powered Down - VOUT is open circuit.
Dual
10=Powered Down - VOUT is loaded with a 100 k resistor to ground.
01=Powered Down - VOUT is loaded with a 1 k resistor to ground.
00=Normal Operation (Not powered-down)
Note 1: Unimplemented bit, read as ‘0’.
2: See Table 5-5 and Figure 5-10 for more details.
2015 Microchip Technology Inc.
DS20005466A-page 35
MCP48FVBXX
Register 4-4 shows the format of the volatile Gain
Control and System Status Register. Each DAC has one
bit to control the gain of the DAC and three Status bits.
REGISTER 4-4:
GAIN CONTROL AND SYSTEM STATUS REGISTER (ADDRESS 0Ah)
R/W-0 R/W-0 R/C-1
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
U-0
—
(1)
Single
Dual
—
—
—
G0
G0
POR
POR
—
—
—
—
—
—
G1
—
—
—
—
—
—
bit 15
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
C = Clearable bit
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
x = Bit is unknown
= Single-channel device
= Dual-channel device
Single
Dual
bit 15-9 bit 15-10 Unimplemented: Read as ‘0’
—
bit 9
bit 8
bit 7
G1: DAC1 Output Driver Gain control bits (Dual-channel device only)
1
0
=2x Gain
=1x Gain
bit 8
bit 7
G0: DAC0 Output Driver Gain control bits
1
0
=2x Gain
=1x Gain
POR: Power-on Reset (Brown-out Reset) Status bit
This bit indicates if a Power-on Reset (POR) or Brown-out Reset (BOR) event has
occurred since the last read command of this register. Reading this register clears the
state of the POR Status bit.
1
=A POR (BOR) event occurred since the last read of this register. Reading this register clears
this bit.
0 = A POR (BOR) event has not occurred since the last read of this register.
bit 6-0
bit 6-0
Unimplemented: Read as ‘0’
Note 1: Unimplemented bit, read as ‘0’.
DS20005466A-page 36
2015 Microchip Technology Inc.
MCP48FVBXX
The functional blocks of the DAC include:
5.0
DAC CIRCUITRY
• Resistor Ladder
The Digital-to-Analog Converter circuitry converts a
digital value into its analog representation. The
description details the functional operation of the device.
• Voltage Reference Selection
• Output Buffer/VOUT Operation
• Internal Band Gap (as a voltage reference)
• Latch Pin (LAT)
The DAC Circuit uses a resistor ladder implementation.
Devices have up to two DACs.
• Power-Down Operation
Figure 5-1 shows the functional block diagram for the
MCP48FVBXX DAC circuitry.
Power-Down
VDD
Operation
PD1:PD0 and
VREF1:VREF0
Voltage
Reference
Selection
VREF
+
-
VDD
VDD
VREF1:VREF0
PD1:PD0 and BGEN
Band Gap
(1.22V typical)
VREF1:VREF0
Internal Band Gap
PD1:PD0
VRL
VDD
Power-Down
Operation
A (RL)
DAC
Output
Selection
PD1:PD0
RS(2 )
n
VW
VOUT
+
RS(2n - 1)
-
PD1:PD0
Gain
RS(2n - 2)
(1x or 2x)
Output Buffer/VOUT
Operation
Power-Down
Operation
RS(2n - 3)
RRL
(~140 k)
DAC Register Value
VW = ------------------------------------------------------------------------------ V RL
# of Resistors in Resistor Ladder
RS(2)
Where:
# of Resistors in Resistor Ladder = 256 (MCP48FVB0X)
= 1024 (MCP48FVB1X)
Resistor
Ladder
RS(1)
= 4096 (MCP48FVB2X)
B
FIGURE 5-1:
MCP48FVBXX DAC Module Block Diagram.
2015 Microchip Technology Inc.
DS20005466A-page 37
MCP48FVBXX
5.1
Resistor Ladder
VRL
DAC
PD1:PD0
The Resistor Ladder is a digital potentiometer with
the B terminal internally grounded and the A terminal
connected to the selected reference voltage (see
Figure 5-2). The volatile DAC register controls the
wiper position. The wiper voltage (VW) is proportional to
the DAC register value divided by the number of
resistor elements (RS) in the ladder (256, 1024 or 4096)
related to the VRL voltage.
Register
RS(2 )
n
2n - 1
(1)
RW
RW
RS(2n - 1)
2n - 2
(1)
The output of the resistor network will drive the input of
an output buffer.
RS(2n - 2)
RRL
The Resistor Network is made up of these three parts:
VW
• Resistor Ladder (string of RS elements)
• Wiper switches
• DAC Register decode
1
0
(1)
(1)
RW
RW
The resistor ladder (RRL) has a typical impedance of
approximately 140 k. This resistor ladder resistance
(RRL) may vary from device to device by up to ±20%.
Since this is a voltage divider configuration, the actual
RRL resistance does not affect the output given a fixed
RS(1)
Analog Mux
voltage at VRL
.
Equation 5-1 shows the calculation for the step
resistance:
DAC Register Value
# of Resistors in Resistor Ladder
VW = ------------------------------------------------------------------------------ V RL
Where:
EQUATION 5-1:
RS CALCULATION
# of Resistors in
Resistor Ladder
=
256 (MCP48FVB0X)
RRL
RS = -------------
8-bit device
= 1024 (MCP48FVB1X)
= 4096 (MCP48FVB2X)
256
RRL
Note 1:
The analog switch resistance (RW) does
not affect performance due to the voltage
divider configuration.
RS = ----------------
10-bit device
12-bit device
1024
RRL
FIGURE 5-2:
Block Diagram.
Resistor Ladder Model
RS = ----------------
4096
Note:
The maximum wiper position is 2n – 1,
while the number of resistors in the
resistor ladder is 2n. This means that
when the DAC register is at full-scale,
there is one resistor element (RS)
between the wiper and the VRL voltage.
If the unbuffered VREF pin is used as the VRL voltage
source, this voltage source should have a low output
impedance.
When the DAC is powered-down, the resistor ladder is
disconnected from the selected reference voltage.
DS20005466A-page 38
2015 Microchip Technology Inc.
MCP48FVBXX
5.2
Voltage Reference Selection
VREF1:VREF0
VDD
The resistor ladder has up to four sources for the
reference voltage. Two User Control bits
VREF
(VREF1:VREF0) are used to control the selection, with
the selection connected to the VRL node (see
Figures 5-3 and 5-4). The four voltage source options
for the Resistor Ladder are:
Band Gap
VRL
1. VDD pin voltage
Buffer
Resistor Ladder Reference
2. Internal Voltage Reference (VBG
3. VREF pin voltage unbuffered
)
FIGURE 5-3:
Voltage Selection Block Diagram.
4.
VREF pin voltage internally buffered
The selection of the voltage is specified with the volatile
VREF1:VREF0 configuration bits (see Register 4-2). On
a POR/BOR event, the default state of the configuration
bits is latched into the volatile VREF1:VREF0
configuration bits.
VDD
PD1:PD0 and
VREF1:VREF0
VREF
When the user selects the VDD as reference, the VREF
pin voltage is not connected to the resistor ladder.
+
-
VRL
If the VREF pin is selected, then a selection has to be
made between the Buffered or Unbuffered mode.
5.2.1
UNBUFFERED MODE
VDD
The VREF pin voltage may be from VSS to VDD
.
Note 1: The voltage source should have a low
output impedance. If the voltage source
has a high output impedance, then the
voltage on the VREF pin would be lower
than expected. The resistor ladder has a
typical impedance of 140 k and a
typical capacitance of 29 pF.
VDD
VREF1:VREF0
VREF1:VREF0
PD1:PD0
and BGEN
Band Gap(1)
(1.22V typical)
2: If the VREF pin is tied to the VDD voltage,
VDD mode (VREF1:VREF0 = ‘00’) is
recommended.
Note 1: The Band Gap voltage (VBG) is 1.22V
typical. The band gap output goes through
the buffer with a 2x gain to create the VRL
voltage. See Section 5.4, “Internal Band
Gap” for additional information on the
band gap circuit.
5.2.2
BUFFERED MODE
The VREF pin voltage may be from 0.01V to
DD – 0.04V. The input buffer (amplifier) provides low
V
offset voltage, low noise, and a very high input
impedance, with only minor limitations on the input
range and frequency response.
FIGURE 5-4:
Implementation Block Diagram.
Reference Voltage Selection
5.2.3 BAND GAP MODE
Note 1: Any variation or noises on the reference
source can directly affect the DAC output.
The reference voltage needs to be as
clean as possible for accurate DAC
performance.
If the Internal Band Gap is selected, then the external
VREF pin should not be driven and only use
high-impedance loads. Decoupling capacitors are
recommended for optimal operation.
The band gap output is buffered, but the internal
switches limit the current that the output should source
to the VREF pin. The resistor ladder buffer is used to
drive the Band Gap voltage for the cases of multiple
DAC outputs. This ensures that the resistor ladders are
always properly sourced when the band gap is selected.
2: If the VREF pin is tied to the VDD voltage,
VDD mode (VREF1:VREF0 = ‘00’) is
recommended.
2015 Microchip Technology Inc.
DS20005466A-page 39
MCP48FVBXX
5.3
Output Buffer/V
Operation
OUT
VDD
The Output Driver buffers the wiper voltage (VW) of the
Resistor Ladder.
PD1:PD0
The DAC output is buffered with a low-power, precision
output amplifier (op amp). This amplifier provides a
rail-to-rail output with low offset voltage and low noise.
The amplifier’s output can drive the resistive and
high-capacitive loads without oscillation. The amplifier
provides a maximum load current which is enough for
most programmable voltage reference applications. Refer
to Section 1.0, “Electrical Characteristics” for the
specifications of the output amplifier.
VOUT
VW
+
-
PD1:PD0
Gain(1)
Note:
The load resistance must be kept higher
than 5 k for stable and expected analog
output (to meet electrical specifications).
Note 1: Gain options are 1x and 2x.
FIGURE 5-5: Output Driver Block Diagram.
5.3.1 PROGRAMMABLE GAIN
Figure 5-5 shows the block diagram of the output driver
circuit.
The user can select the output gain of the output
amplifier. The gain options are:
The amplifier’s gain is controlled by the Gain (G)
configuration bit (see Register 4-4) and the VRL
reference selection (see Section 5.2, “Voltage
Reference Selection”).
a) Gain of 1, with either the VDD or VREF pin used
as reference voltage.
b) Gain of 2.
The volatile G bit value can be modified by:
• POR events
Power-down logic also controls the output buffer
operation
(see
for
Section
5.6,
“Power-Down
information on
• BOR events
Operation”)
additional
Power-Down. In any of the three power-down modes,
the op amp is powered-down and its output becomes a
high impedance to the VOUT pin.
• SPI write commands
Table 5-1 shows the gain bit operation.
TABLE 5-1:
OUTPUT DRIVER GAIN
Gain Bit Gain
Comment
0
1
1
2
—
Limits VREF pin voltages
relative to device VDD voltage.
DS20005466A-page 40
2015 Microchip Technology Inc.
MCP48FVBXX
5.3.2
OUTPUT VOLTAGE
5.3.3
STEP VOLTAGE (VS)
The volatile DAC Register values, along with the device
configuration bits, control the analog VOUT voltage. The
volatile DAC Register’s value is unsigned binary. The
formula for the output voltage is given in Equation 5-2.
Table 5-3 shows examples of volatile DAC register
values and the corresponding theoretical VOUT voltage
for the MCP48FVBXX devices.
The Step Voltage is dependent on the device resolution
and the calculated output voltage range. 1 LSb is
defined as the ideal voltage difference between two
successive codes. The step voltage can easily be
calculated by using Equation 5-3. Theoretical step
voltages are shown in Table 5-2 for several VREF
voltages.
EQUATION 5-2:
CALCULATING OUTPUT
VOLTAGE (VOUT
EQUATION 5-3:
VS CALCULATION
)
VRL
VRL DAC Register Value
VS = ------------------------------------------------------------------------------ G a i n
VOUT = ------------------------------------------------------------------------------ G a i n
# of Resistors in Resistor Ladder
# of Resistors in Resistor Ladder
Where:
Where:
# of Resistors in = 4096 (12-bit)
# of Resistors in = 4096 (MCP48FVB2X)
Resistor Ladder
Resistor Ladder
= 1024 (10-bit)
= 1024 (MCP48FVB1X)
=
256 (8-bit)
=
256 (MCP48FVB0X)
TABLE 5-2:
5.0
THEORETICAL STEP
Note:
When Gain = 2 (VRL = VREF) and
VOLTAGE (VS) ( )
1
if VREF > VDD / 2, the VOUT voltage will be
limited to VDD. So if VREF = VDD, then the
VOUT voltage will not change for volatile
DAC Register values mid-scale and greater,
since the op amp is at full-scale output.
VREF
2.7
1.8
1.5
1.0
12-bit
10-bit
1.22 mV 659 µV 439 µV 366 µV 244 µV
4.88 mV 2.64 mV 1.76 mV 1.46 mV 977 µV
The following events update the DAC register value
and therefore the analog voltage output (VOUT):
VS
19.5 mV 10.5 mV
7.03 mV
5.86 mV
3.91 mV 8-bit
• Power-on Reset
• Brown-out Reset
• Write command
Note 1:When Gain = 1x, VFS = VRL, and VZS = 0V.
The VOUT voltage will start driving to the new value
after any of these events has occurred.
2015 Microchip Technology Inc.
DS20005466A-page 41
MCP48FVBXX
5.3.4
OUTPUT SLEW RATE
5.3.5
DRIVING RESISTIVE AND
CAPACITIVE LOADS
Figure 5-6 shows an example of the slew rate of the
VOUT pin. The slew rate can be affected by the
characteristics of the circuit connected to the VOUT pin.
The VOUT pin can drive up to 100 pF of capacitive load
in parallel with a 5 k resistive load (to meet electrical
specifications).
A
VOUT vs. Resistive Load
characterization graph is provided in the Typical
VOUT(B)
Performance
MCP48FXBXX
DS20005440).
Curves
for
this
device
(see
-
“Typical Performance Curves”
VOUT drops slowly as the load resistance decreases
after about 3.5 k. It is recommended to use a load
with RL greater than 5 k.
VOUT(A)
DACx = A
DACx= B
Driving large capacitive loads can cause stability
problems for voltage feedback op amps. As the load
capacitance increases, the feedback loop’s phase
margin decreases and the closed-loop bandwidth is
reduced. This produces gain peaking in the frequency
response with overshoot and ringing in the step
response. That is, since the VOUT pin’s voltage does
not quickly follow the buffer’s input voltage (due to the
large capacitive load), the output buffer will overshoot
the desired target voltage. Once the driver detects this
overshoot, it compensates by forcing it to a voltage
below the target. This causes voltage ringing on the
VOUT pin.
Time
V
OUTB – VOUTA
Slew Rate = --------------------------------------------------
T
FIGURE 5-6:
VOUT Pin Slew Rate.
5.3.4.1
Small Capacitive Load
With a small capacitive load, the output buffer’s current
is not affected by the capacitive load (CL). But still, the
VOUT pin’s voltage is not a step transition from one
output value (DAC register value) to the next output
value. The change of the VOUT voltage is limited by the
output buffer’s characteristics, so the VOUT pin voltage
will have a slope from the initial voltage to the new
voltage. This slope is fixed for the output buffer, and is
referred to as the buffer slew rate (SRBUF).
When driving large capacitive loads with the output
buffer, a small series resistor (RISO) at the output (see
Figure 5-7) improves the output buffer’s stability
(feedback loop’s phase margin) by making the output
load resistive at higher frequencies. The bandwidth will
be generally lower than the bandwidth with no
capacitive load.
5.3.4.2
Large Capacitive Load
With a larger capacitive load, the slew rate is
determined by two factors:
• The output buffer’s short-circuit current (ISC
)
VOUT
VCL
CL
Op
Amp
VW
• The VOUT pin’s external load
RISO
IOUT cannot exceed the output buffer’s short-circuit
current (ISC), which fixes the output buffer slew rate
RL
(SRBUF). The voltage on the capacitive load (CL), VCL
,
changes at a rate proportional to IOUT, which fixes a
capacitive load slew rate (SRCL).
FIGURE 5-7:
Buffer for Large Capacitive Loads (CL).
Circuit to Stabilize Output
The VCL voltage slew rate is limited to the slower of the
output buffer’s internally set slew rate (SRBUF) and the
capacitive load slew rate (SRCL).
The RISO resistor value for your circuit needs to be
selected. The resulting frequency response peaking
and step response overshoot for this RISO resistor
value should be verified on the bench. Modify the
RISO’s resistance value until the output characteristics
meet your requirements.
A method to evaluate the system’s performance is to
inject a step voltage on the VREF pin and observe the
VOUT pin’s characteristics.
Note:
Additional insight into circuit design for
driving capacitive loads can be found in
AN884 – “Driving Capacitive Loads With
Op Amps” (DS00884).
DS20005466A-page 42
2015 Microchip Technology Inc.
MCP48FVBXX
TABLE 5-3:
Device
DAC INPUT CODE VS. CALCULATED ANALOG OUTPUT (VOUT) (VDD = 5.0V)
(3)
LSb
Equation
5.0V/4096 1,220.7
2.5V/4096 610.4
VOUT
Equation
Volatile DAC
Register Value
Gain
(1)
VRL
Selection(2)
µV
V
1111 1111 1111 5.0V
1x
1x
2x (2)
VRL (4095/4096) 1
VRL (4095/4096) 1
VRL (4095/4096) 2)
VRL (2047/4096) 1)
VRL (2047/4096) 1)
VRL (2047/4096) 2)
VRL (1023/4096) 1)
VRL (1023/4096) 1)
VRL (1023/4096) 2)
VRL * (0/4096) 1)
VRL * (0/4096) 1)
VRL * (0/4096) 2)
VRL (1023/1024) 1
VRL (1023/1024) 1
VRL (1023/1024) 2
VRL (511/1024) 1
VRL (511/1024) 1
VRL (511/1024) 2
VRL (255/1024) 1
VRL (255/1024) 1
VRL (255/1024) 2
VRL (0/1024) 1
4.998779
2.499390
4.998779
2.498779
1.249390
2.498779
1.248779
0.624390
1.248779
0
2.5V
0111 1111 1111 5.0V
5.0V/4096 1,220.7
2.5V/4096 610.4
1x
2.5V
1x
2x (2)
0011 1111 1111 5.0V
5.0V/4096 1,220.7
2.5V/4096 610.4
1x
2.5V
1x
2x (2)
0000 0000 0000 5.0V
5.0V/4096 1,220.7
2.5V/4096 610.4
1x
2.5V
1x
2x (2)
0
0
11 1111 1111
01 1111 1111
00 1111 1111
00 0000 0000
1111 1111
5.0V
2.5V
5.0V/1024 4,882.8
2.5V/1024 2,441.4
1x
4.995117
2.497559
4.995117
2.495117
1.247559
2.495117
1.245117
0.622559
1.245117
0
1x
2x (2)
5.0V
2.5V
5.0V/1024 4,882.8
2.5V/1024 2,441.4
1x
1x
2x (2)
5.0V
2.5V
5.0V/1024 4,882.8
2.5V/1024 2,441.4
1x
1x
2x (2)
5.0V
2.5V
5.0V/1024 4,882.8
2.5V/1024 2,441.4
1x
1x
VRL (0/1024) 1
0
2x (2)
VRL (0/1024) 1
0
5.0V
2.5V
5.0V/256 19,531.3
1x
VRL (255/256) 1
VRL (255/256) 1
VRL (255/256) 2
VRL (127/256) 1
VRL (127/256) 1
VRL (127/256) 2
VRL (63/256) 1
4.980469
2.490234
4.980469
2.480469
1.240234
2.480469
1.230469
0.615234
1.230469
0
2.5V/256
9,765.6
1x
2x (2)
0111 1111
5.0V
2.5V
5.0V/256 19,531.3
2.5V/256 9,765.6
1x
1x
2x (2)
0011 1111
5.0V
2.5V
5.0V/256 19,531.3
2.5V/256 9,765.6
1x
1x
2x (2)
VRL (63/256) 1
VRL (63/256) 2
0000 0000
5.0V
2.5V
5.0V/256 19,531.3
2.5V/256 9,765.6
1x
VRL (0/256) 1
1x
VRL (0/256) 1
0
2x (2)
VRL (0/256) 2
0
Note 1: VRL is the resistor ladder’s reference voltage. It is independent of VREF1:VREF0 selection.
2: Gain selection of 2x (Gx = ‘1‘) requires voltage reference source to come from VREF pin
(VREF1:VREF0 = ‘10‘ or ‘11’) and requires VREF pin voltage (or VRL) ≤ VDD/2, or from the internal band
gap (VREF1:VREF0 = ‘01’).
3: These theoretical calculations do not take into account the Offset, Gain and Nonlinearity errors.
2015 Microchip Technology Inc.
DS20005466A-page 43
MCP48FVBXX
5.4
Internal Band Gap
The internal band gap is designed to drive the Resistor
Ladder Buffer.
The resistance of a resistor ladder (RRL) is targeted to
be 140 k (40 k), which means
resistance of 100 k.
a minimum
The band gap selection can be used across the
VDD voltages while maximizing the VOUT voltage
ranges. For VDD voltages below the 2 Gain VBG
voltage, the output for the upper codes will be clipped
to the VDD voltage. Table 5-4 shows the maximum
DAC register code given device VDD and Gain bit
setting.
TABLE 5-4:
VOUT USING BAND GAP
Max DAC Code (1)
12-bit 10-bit 8-bit
Comment
(2)
(2)
1
FFFh 3FFh FFh
FFFh 3FFh FFh
FFFh 3FFh FFh
V
V
V
= 2.44V
= 4.88V
= 2.44V
OUT(max)
OUT(max)
OUT(max)
5.5
2
2
( )
1
2.7
2
8DAh 236h 8Dh ~ 0 to 55% range
D1Dh 347h D1h ~ 0 to 82% range
68Eh 1A3h 68h ~ 0 to 41% range
1
(3)
2.0
4
(
)
2
Note 1: Without the VOUT pin voltage being clipped.
2: When VBG = 1.22V typical.
3: Band gap performance achieves full
performance starting from a VDD of 2.0V.
4: It is recommended to use Gain = 1 setting
instead.
DS20005466A-page 44
2015 Microchip Technology Inc.
MCP48FVBXX
5.5
Latch Pin (LAT)
Serial Shift Reg
The Latch pin controls when the volatile DAC Register
value is transferred to the DAC wiper. This is useful for
applications that need to synchronize the wiper(s)
updates to an external event, such as zero crossing or
updates to the other wipers on the device. The LAT pin
is asynchronous to the serial interface operation.
Register Address
Write Command
16 Clocks
Vol. DAC Register x
LAT
SYNC
(internal signal)
Transfer
Data
When the LAT pin is high, transfers from the volatile DAC
register to the DAC wiper are inhibited. The volatile DAC
register value(s) can still be updated.
DAC wiper x
When the LAT pin is low, the volatile DAC register value
is transferred to the DAC wiper.
Transfer
Data
LAT SYNC
Comment
1
1
0
0
1
0
1
0
0
0
1
0
No Transfer
No Transfer
Note:
This allows both the volatile DAC0 and
DAC1 registers to be updated while the
LAT pin is high, and to have outputs
synchronously updated as the LAT pin is
driven low.
Vol. DAC Register x DAC wiper x
No Transfer
FIGURE 5-8:
LAT and DAC Interaction.
Figure 5-8 shows the interaction of the LAT pin and the
loading of the DAC wiper x (from the volatile DAC
Register x). The transfers are level driven. If the
LAT pin is held low, the corresponding DAC wiper is
updated as soon as the volatile DAC Register value is
updated.
The LAT pin allows the DAC wiper to be updated to an
external event as well as have multiple DAC
channels/devices update at a common event.
Since the DAC wiper x is updated from the Volatile
DAC Register x, all DACs that are associated with a
given LAT pin can be updated synchronously.
If the application does not require synchronization, then
this signal should be tied low.
Figure 5-9 shows two cases of using the LAT pin to
control when the wiper register is updated relative to
the value of a sine wave signal.
Case 1: Zero Crossing of sine wave to update volatile DAC0 register (using LAT pin)
Case 2: Fixed Point Crossing of sine wave to update volatile DAC0 register (using LAT pin)
Indicates where LAT pin pulses active (volatile DAC0 register updated).
FIGURE 5-9:
Example Use of LAT Pin Operation.
2015 Microchip Technology Inc.
DS20005466A-page 45
MCP48FVBXX
5.6
Power-Down Operation
VDD
To allow the application to conserve power when the
DAC operation is not required, three power-down
modes are available. The Power-Down configuration
bits (PD1:PD0) control the power-down operation
(see Figure 5-10 and Table 5-5). On devices with mul-
tiple DACs, each DACs power-down mode is individu-
ally controllable. All power-down modes do the
following:
PD1:PD0
VOUT
VW
+
-
PD1:PD0
Gain(1)
• Turn off most of the DAC module’s internal circuits
(output op amp, resistor ladder, et al.)
• Op amp output becomes high-impedance to the
VOUT pin
• Disconnects resistor ladder from reference
voltage (VRL
)
Note 1: Gain options are 1x and 2x.
Depending on the selected power-down mode, the
following will occur:
FIGURE 5-10:
Diagram.
VOUT Power-Down Block
• VOUT pin is switched to one of two resistive
pull-downs (see Table 5-5):
TABLE 5-5:
POWER-DOWN BITS AND
OUTPUT RESISTIVE LOAD
- 100 k (typical)
- 1 k (typical)
• Op amp is powered-down and the VOUT pin
becomes high-impedance.
PD1
PD0
Function
0
0
1
1
0
1
0
1
Normal operation
1 k resistor to ground
100 k resistor to ground
Open circuit
There is a delay (TPDE) between the PD1:PD0 bits
changing from ‘00’ to either ‘01’, ‘10’ or ‘11’ with the
op amp no longer driving the VOUT output and the
pull-down resistors sinking current.
Table 5-6 shows the current sources for the DAC based
on the selected source of the DAC’s reference voltage
and if the device is in normal operating mode or one of
the power-down modes.
In any of the power-down modes where the VOUT pin is
not externally connected (sinking or sourcing current),
the power-down current will typically be ~650 nA for a
single-DAC device. As the number of DACs increases,
the device’s power-down current will also increase.
TABLE 5-6:
DAC CURRENT SOURCES
The Power-Down bits are modified by using a write
command to the volatile Power-Down register, or a POR
event which loads the default Power-Down register
values to the volatile Power-Down register.
PD1:0 = ‘00’,
VREF1:0 =
PD1:0 ‘00’,
VREF1:0 =
Device VDD
Current
Source
00 01 10 11 00 01 10 11
Section 7.0, “SPI Commands” describes the SPI
commands. The Write Command can be used to
update the volatile PD1:PD0 bits.
Output
Op Amp
Y
Y
Y
Y
N
N
N
N
N (1)
N (1)
Resistor
Ladder
Y
Y
Y
N
N
N
Note:
The SPI serial interface circuit is not
affected by the Power-Down mode. This
circuit remains active in order to receive
any command that might come from the
host controller device.
RL Op Amp
Band Gap
N
N
Y
Y
N
N
Y
N
N
N
N
Y
N
N
N
N
Note 1: Current is sourced from the VREF pin, not
the device VDD
.
DS20005466A-page 46
2015 Microchip Technology Inc.
MCP48FVBXX
5.6.1
EXITING POWER-DOWN
5.7
DAC Registers, Configuration
Bits, and Status Bits
When the device exits Power-Down mode, the
following occurs:
The MCP48FVBXX devices have volatile memory.
Table 4-2 shows the volatile memory and its interaction
due to a POR event.
• Disabled circuits (op amp, resistor ladder, et al.)
are turned on
• The resistor ladder is connected to selected
In the volatile memory, there are five configuration bits,
the DAC registers and two volatile status bits. The
volatile DAC registers will be either 12 bits
(MCP48FVB2X), 10 bits (MCP48FVB1X), or 8 bits
(MCP48FVB0X) wide.
reference voltage (VRL
)
• The selected pull-down resistor is disconnected
• The VOUT output is driven to the voltage
represented by the volatile DAC Register’s value
and configuration bits
When the device is first powered-up, it automatically
loads the device default values to the volatile memory.
The volatile memory determines the analog output
(VOUT) pin voltage. After the device is powered-up, the
user can update the device memory.
The VOUT output signal will require time as these
circuits are powered-up and the output voltage is driven
to the specified value as determined by the volatile
DAC register and configuration bits.
The memory is read and written using an SPI interface.
Refer to Sections 6.0, “SPI Serial Interface Module”
and 7.0, “SPI Commands” for more details on reading
and writing the device’s memory.
Note:
Since the op amp and resistor ladder were
powered-off (0V), the op amp’s input
voltage (VW) can be considered 0V. There
is a delay (TPDD) between the PD1:PD0
bits updating to ‘00’ and the op amp
driving the VOUT output. The op amp’s
settling time (from 0V) needs to be taken
into account to ensure the VOUT voltage
reflects the selected value.
Register 4-4 shows the operation of the device status
bits, and Table 4-2 shows the default factory value of
the device configuration bits after a POR/BOR event.
There is one status bit (the POR bit) which indicates if
the device VDD is above or below the POR trip point.
After a POR event, this bit is a ‘1’. Reading the Gain
Control and System Status register clears this bit (‘0’).
A write command forcing the PD1:PD0 bits to ‘00’, will
cause the device to exit the power-down mode.
2015 Microchip Technology Inc.
DS20005466A-page 47
MCP48FVBXX
NOTES:
DS20005466A-page 48
2015 Microchip Technology Inc.
MCP48FVBXX
6.2
SPI SERIAL INTERFACE
6.0
SPI SERIAL INTERFACE
MODULE
The MCP48FVBXX devices support the SPI serial
protocol. This SPI operates in slave mode (does not
generate the serial clock).
The MCP48FVBXX’s SPI Serial Interface Module
supports the SPI serial protocol specification.
Figure 6-1 shows a typical SPI interface connection.
The SPI interface uses up to four pins. These are:
The command format and waveforms for the
MCP48FVBXX are defined in Section 7.0, “SPI
Commands”.
• CS - Chip Select
• SCK - Serial Clock
• SDI - Serial Data In
• SDO - Serial Data Out
6.1
Overview
A typical SPI Interface is shown in Figure 6-1. In the
SPI interface, the Master’s Output pin is connected to
the Slave’s Input pin, and the Master’s Input pin is
connected to the Slave’s Output pin.
This section details some of the specific characteristics of
the MCP48FVBXX’s Serial Interface Module.
The following sections discuss some of these
device-specific characteristics:
The MCP48FVBXX SPI module supports two (of the
four) standard SPI modes. These are Mode 0,0 and
1,1. The SPI mode is determined by the state of the
SCK pin (VIH or VIL) when the CS pin transitions from
inactive (VIH) to active (VIL).
• Communication Data Rates
• POR/BOR
• Interface Pins (CS, SCK, SDI, SDO, and
LAT/HVC)
An additional HVC pin is available for High Voltage
command
support
(for
compatibility
with
MCP48FEBXX devices). The HVC pin is high-voltage
tolerant.
6.3
Communication Data Rates
The MCP48FVBXX devices support clock rates (bit
rate) of up to 20 MHz for write commands and 10 MHz
for read commands.
For most applications, the write time will be considered
more important, since that is how the device operation
is controlled.
6.4
POR/BOR
On a POR/BOR event, the SPI Serial Interface Module
state machine is reset, which includes that the
Device’s Memory Address pointer is forced to 00h.
Typical SPI Interface Connections
MCP48FVBXX
Host
Controller
(Master Out - Slave In (MOSI))
(Master In - Slave Out (MISO))
SDI
SDO
SDO
SCK
CS
SDI
SCK
I/O
HVC(1)
I/O
Note 1: The pin is compatible with HVC levels used for non-volatile MCP48FEBXX devices.
FIGURE 6-1: Typical SPI Interface Block Diagram.
2015 Microchip Technology Inc.
DS20005466A-page 49
MCP48FVBXX
6.5.4
THE CS SIGNAL
6.5
Interface Pins (CS, SCK, SDI, SDO,
and LAT/HVC)
The Chip Select (CS) signal is used to select the
device and frame a command sequence. To start a
command, or sequence of commands, the CS signal
must transition from the inactive state (VIH) to the
The operation of the five interface pins is discussed in
this section. These pins are:
• SDI (Serial Data In)
active state (VIL).
• SDO (Serial Data Out)
• SCK (Serial Clock)
• CS (Chip Select)
After the CS signal has gone active, the SDO pin is
driven and the clock bit counter is reset.
• LAT/HVC (High Voltagecommand)
Note: There is a required delay after the CS pin
goes active to the 1st edge of the SCK pin.
The serial interface works on a 24-bit boundary. The
Chip Select (CS) pin frames the SPI commands.
If an error condition occurs for an SPI command, then
the command byte’s Command Error (CMDERR) bit
(on the SDO pin) will be driven low (VIL). To exit the
6.5.1
SERIAL DATA IN (SDI)
The Serial Data In (SDI) signal is the data signal into
the device. The value on this pin is latched on the
rising edge of the SCK signal.
error condition, the user must take the CS pin to the
VIH level.
When the CS pin returns to the inactive state (VIH), the
6.5.2
SERIAL DATA OUT (SDO)
SPI module resets (including the address pointer).
While the CS pin is in the inactive state (VIH), the serial
The Serial Data Out (SDO) signal is the data signal out
of the device. The value on this pin is driven on the
falling edge of the SCK signal.
interface is ignored. This allows the Host Controller to
interface to other SPI devices using the same SDI,
SDO, and SCK signals.
Once the CS pin is forced to the active level (VIL), the
SDO pin will be driven. The state of the SDO pin is
determined by the serial bit’s position in the command,
the command selected, and if there is a command
error state (CMDERR).
6.5.5
THE HVC SIGNAL
The HVC pin is compatible with High Voltage com-
mands levels (used with MCP48FEBXX devices).
6.5.3
SERIAL CLOCK (SCK)
(SPI FREQUENCY OF OPERATION)
6.6
The SPI Modes
The SPI module supports two (of the four) standard SPI
modes. These are Mode 0,0and 1,1. The SPI mode is
determined by the state of the SCK pin (VIH or VIL)
when the CS pin transitions from inactive (VIH) to active
(VIL).
The SPI interface is specified to operate up to 20 MHz.
The actual clock rate depends on the configuration of
the system and the serial command used. Table 6-1
shows the SCK frequency for different configurations.
TABLE 6-1:
SCK FREQUENCY
Command
6.6.1
MODE 0,0
In Mode 0,0:
Memory Type Access
• SCK idle state = low (VIL)
Read
Write
• Data is clocked in on the SDI pin on the rising
edge of SCK
Volatile
SDI, SDO 10 MHz
20 MHz (1)
Memory
• Data is clocked out on the SDO pin on the falling
edge of SCK
Note 1: Write interface speed is faster than read
interface speed due to read access
times.
6.6.2
MODE 1,1
In Mode 1,1:
• SCK idle state = high (VIH)
• Data is clocked in on the SDI pin on the rising
edge of SCK
• Data is clocked out on the SDO pin on the falling
edge of SCK
DS20005466A-page 50
2015 Microchip Technology Inc.
MCP48FVBXX
The supported commands are shown in Table 7-1. These
commands allow for both single data or continuous data
operation. Table 7-1 also shows the required number of
bit clocks for each command’s different mode of
operation.
7.0
SPI COMMANDS
This section documents the commands that the device
supports.
The MCP48FVBXX’s SPI command format supports
32 memory address locations and two commands.
The 24-bit commands (see Figure 7-1) are used to
read and write to the device registers (Read
Command and Write Command). These commands
contain a Command Byte and two Data Bytes.
The two commands are:
• Writecommand (C1:C0 = ‘00’)
• Readcommand (C1:C0 = ‘11’)
Table 7-2 shows an overview of all the SPI commands
and their interaction with other device features.
TABLE 7-1:
Operation
SPI COMMANDS - NUMBER OF CLOCKS
Data Update Rate
(8-bit/10-bit/12-bit)
(Data Words/Second)
Command
Code
# of Bit
Comments
Clocks (1)
HV
Mode
@
@
@
C1 C0
1 MHz
10 MHz
20 MHz
No (2)
No (2)
No (2)
No (2)
0 0
0 0
1 1
1 1
Single
24
41,666
416,666
416,666
416,666
416,666
833,333
Write Command
Read Command
Continuous
Single
24 n
24
41,666
41,666
41,666
833,333 For 10 data words
N.A.
Continuous
24 n
N.A.
For 10 data words
Note 1: “n” indicates the number of times the command operation is to be repeated.
2: If the state of the HVC pin is VIHH, then the command is ignored, but a Command Error condition
(CMDERR) will NOT be generated.
2015 Microchip Technology Inc.
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MCP48FVBXX
7.0.1
COMMAND BYTE
TABLE 7-2:
C1:C0
COMMAND BITS OVERVIEW
The Command Byte has three fields: the address, the
command, and one data bit (see Figure 7-1).
bit
Command
# of Bits
Normal or HV
The device memory is accessed when the master
sends a proper command byte to select the desired
operation. The memory location getting accessed is
contained in the command byte’s AD4:AD0 bits. The
action desired is contained in the command byte’s
C1:C0 bits, see Table 7-3. C1:C0 determines if the
desired memory location will be read or written.
states
00
01
10
11
Write Data
Reserved
Reserved
Read Data
24 Bits
—
Normal
—
—
—
24 Bits
Normal
As the command byte is being loaded into the device
(on the SDI pin), the device’s SDO pin is driving. The
SDO pin will output high bits for the first seven bits of
that command. On the 8th bit, the SDO pin will output
the CMDERR bit state (see Section 7.0.3, “Error
Condition”).
7.0.2
DATA BYTES
These commands concatenate the two data bytes
after the command byte, for a 24-bit long command
(see Figure 7-1).
24-bit Command
Data Word (2 Bytes)
Command Byte
A A A A A C C C D D D D D D D D D D D D D D D D
D D D D D 1 0 M 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
Command
Bits
C C
4 3 2 1 0
D 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
E
R
R
1
0
0
0= Write Data(1)
0 1= Reserved
1 0= Reserved
1
1= Read Data(1)
Data Bits (8, 10, or 12 bits)
Memory
Address
Command
Bits
Note 1: This command uses the 24-bit format.
FIGURE 7-1: 24-bit SPI Command Format.
DS20005466A-page 52
2015 Microchip Technology Inc.
MCP48FVBXX
7.0.3
ERROR CONDITION
7.0.4
CONTINUOUS COMMANDS
The Command Error (CMDERR) bit indicates if the
five address bits received (AD4:AD0) and the two
The device supports the ability to execute commands
continuously. While the CS pin is in the active state
(VIL), any sequence of valid commands may be
command bits received (C1:C0) are
a
valid
combination (see Figure 7-1). The CMDERR bit is
high if the combination is valid and low if the
combination is invalid.
received.
The following example is a valid sequence of events:
1. CS pin driven active (VIL)
SPI commands that do not have a multiple of eight
clocks are ignored.
2. Readcommand
3. Writecommand (Volatile memory)
4. CS pin driven inactive (VIH)
Once an error condition has occurred, any following
commands are ignored. All following SDO bits will be
low until the CMDERR condition is cleared by forcing
the CS pin to the inactive state (VIH).
Note 1:It is recommended that while the CS pin is
active, only one type of command should
be issued. When changing commands, it
is advisable to take the CS pin inactive
then force it back to the active state.
7.0.3.1
Aborting a Transmission
All SPI transmissions must have the correct number of
SCK pulses to be executed. The command is not
executed until the complete number of clocks has
been received. If the CS pin is forced to the inactive
state (VIH), the serial interface is reset. Partial com-
2: It is also recommended that long
command strings should be broken down
into shorter command strings. This
reduces the probability of noise on the
SCK pin, corrupting the desired SPI
command string.
mands are not executed.
SPI is more susceptible to noise than other bus
protocols. The most likely case is that noise corrupts
the value of the data being clocked into the
MCP48FVBXX or the SCK pin is injected with extra
clock pulses. This may cause data to be corrupted in
the device, or a Command Error to occur, since the
address and command bits were not
a valid
combination. The extra SCK pulse will also cause the
SPI data (SDI) and clock (SCK) to be out of sync.
Forcing the CS pin to the inactive state (VIH) resets the
serial interface. The MCP48FVBXX’s SPI interface will
ignore activity on the SDI and SCK pins until the CS
pin transition to the active state is detected (VIH to VIL).
Note 1:When data is not being received by the
MCP48FVBXX, it is recommended that the
CS pin be forced to the inactive level (VIH).
2: It is also recommended that long
continuous command strings be broken
down into single commands or shorter
continuous command strings. This
reduces the probability of noise on the
SCK pin corrupting the desired SPI
commands.
2015 Microchip Technology Inc.
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MCP48FVBXX
7.1.2
CONTINUOUS WRITES TO
VOLATILE MEMORY
7.1
Write Command
Write commands are used to transfer data to the
desired memory location (from the Host controller).
A continuous write mode of operation is possible when
writing to the device’s volatile memory registers (see
Table 7-3). Figure 7-3 shows the sequence for three
continuous writes. The writes do not need to be to the
same volatile memory address.
Write commands can be structured as either Single or
Continuous.
The format of the command is shown in Figures 7-2
(Single) and 7-3 (Continuous).
TABLE 7-3:
VOLATILE MEMORY
ADDRESSES
A write command to a volatile memory location
changes that location after a properly formatted write
command has been received.
Address
Single-Channel
Dual-Channel
00h
01h
08h
09h
0Ah
Yes
No
Yes
Yes
Yes
Yes
Yes
Note 1: During device communication, if the
Device Address/Command combination
is invalid or an unimplemented Device
Yes
Yes
Yes
Address
is
specified,
then
the
MCP48FVBXX will generate a Command
Error state. To reset the SPI state
machine, the CS pin must transition to
the inactive state (VIH).
7.1.1
SINGLE WRITE TO VOLATILE
MEMORY
The write operation requires that the CS pin be in the
active state (VIL). Typically, the CS pin will be in the
inactive state (VIH) and is driven to the active state
(VIL). The 24-bit Write command (Command Byte
and Data Bytes) is then clocked in on the SCK and
SDI pins. Once all 24 bits have been received, the
specified volatile address is updated. A write will not
occur if the Write command is not exactly 24 clock
pulses. This protects against system issues corrupting
the volatile memory locations.
Figures 7-4 and 7-5 show the waveforms for a single
write (depending on SPI mode).
Address
Command
Data bits (8, 10, or 12 bits)
A
D
4
A
D
3
A
D
2
A
D
1
A
D
0
0
0
C
M
D
E
D
1
5
D
1
4
D
1
3
D
1
2
D
1
1
D
1
0
D
0
9
D
0
8
D
0
7
D
0
6
D
0
5
D
0
4
D
0
3
D
0
2
D
0
1
D
0
0
SDI
R
R
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Valid (1)
Invalid (2, 3)
SDO
Note 1: If a valid Address/Command occurs, then the data bits are dependent on the resolution of the device.
12-bit = D11:D00, 10-bit = D09:D00, and 8-bit = D07:D00. Data is right justified for ease of Host Controller
operation (i.e., no data manipulation before transmitting the desired value).
2: Unimplemented data bits (D15:D12 on 12-bit device, D15:D10 on 10-bit device, D15:D08 on 8-bit device)
will be output as ‘1’.
3: If an Error condition occurs (CMDERR = L), all following SDO bits will be low until the CMDERR condition
is cleared (the CS pin is forced to the inactive state).
FIGURE 7-2:
Write Command - SDI and SDO States.
DS20005466A-page 54
2015 Microchip Technology Inc.
MCP48FVBXX
Address
Command
Data bits (8, 10, or 12 bits)
A
D
4
A
D
3
A
D
2
A
D
1
A
D
0
0
0
C
M
D
E
D
1
5
D
1
4
D
1
3
D
1
2
D
1
1
D
1
0
D
0
9
D
0
8
D
0
7
D
0
6
D
0
5
D
0
4
D
0
3
D
0
2
D
0
1
D
0
0
SDI
R
R
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Valid (1)
Invalid (2, 3)
SDO
Address
Command
Data bits (8, 10, or 12 bits)
A
D
4
A
D
3
A
D
2
A
D
1
A
D
0
0
0
C
M
D
E
D
1
5
D
1
4
D
1
3
D
1
2
D
1
1
D
1
0
D
0
9
D
0
8
D
0
7
D
0
6
D
0
5
D
0
4
D
0
3
D
0
2
D
0
1
D
0
0
SDI
R
R
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
(4)
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Valid (1)
Invalid (2, 3)
SDO
Address
Command
Data bits (8, 10, or 12 bits)
A
D
4
A
D
3
A
D
2
A
D
1
A
D
0
0
0
C
M
D
E
D
1
5
D
1
4
D
1
3
D
1
2
D
1
1
D
1
0
D
0
9
D
0
8
D
0
7
D
0
6
D
0
5
D
0
4
D
0
3
D
0
2
D
0
1
D
0
0
SDI
R
R
SDO 1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
(4)
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Valid (1)
Invalid (2, 3)
Note 1: If a valid Address/Command occurs, then the data bits are dependent on the resolution of the device.
12-bit = D11:D00, 10-bit = D09:D00, and 8-bit = D07:D00. Data is right justified for ease of Host Controller
operation (i.e., no data manipulation before transmitting the desired value).
2: Unimplemented data bits (D15:D12 on 12-bit device, D15:D10 on 10-bit device, D15:D08 on 8-bit device)
will be output as ‘1’.
3: If an Error condition occurs (CMDERR = L), all following SDO bits will be low until the CMDERR condition
is cleared (the CS pin is forced to the inactive state).
4: This CMDERR bit will be forced to ‘0’, regardless if this Address+Command combination is valid. This
command will not be completed and requires the CS pin to return to VIH to clear the CMDERR condition.
FIGURE 7-3:
Continuous Write Sequence.
2015 Microchip Technology Inc.
DS20005466A-page 55
MCP48FVBXX
HVC (1)
VIH
CS
VIL
SCK
PIC Write to
SSPBUF
CMDERR bit
SDO
SDI
bit23 bit22 bit21 bit20 bit19 bit18 bit17 bit16 bit15
bit1
bit0
AD4 AD3 AD2 AD1 AD0
D16 D15
bit16 bit15
D1
D0
bit23 bit22 bit21 bit20
bit19
bit1
bit0
0
0
Input
Sample
Note 1: If the state of the HVC pin is VIHH, then the command is ignored, but a Command Error condition (CMDERR) will NOT be generated.
FIGURE 7-4:
24-Bit Write Command (C1:C0 = “00”) - SPI Waveform with PIC MCU (Mode 1,1).
HVC (1)
VIH
CS
VIL
SCK
PIC Write to
SSPBUF
CMDERR bit
SDO
SDI
bit23 bit22 bit21 bit20 bit19 bit18 bit17 bit16 bit15
bit1
bit0
AD4 AD3 AD2 AD1 AD0
bit23 bit22 bit21 bit20 bit19
D16 D15
bit16 bit15
D1
bit1
D0
bit0
0
0
Input
Sample
Note 1: If the state of the HVC pin is VIHH, then the command is ignored, but a Command Error condition (CMDERR) will NOT be generated.
FIGURE 7-5:
24-Bit Write Command (C1:C0 = “00”) - SPI Waveform with PIC MCU (Mode 0,0).
DS20005466A-page 56
2015 Microchip Technology Inc.
MCP48FVBXX
7.2.1
LAT PIN INTERACTION
7.2
Read Command
During a Readcommand of the DACx Registers, if the
LAT pin transitions from VIH to VIL, then the read data
The Readcommand is a 24-bit command and is used
to transfer data from the specified memory location to
the Host controller. The Readcommand can be issued
to the volatile memory locations. The format of the
command as well as an example SDI and SDO data is
shown in Figure 7-6.
may be corrupted. This is due to the fact that the data
being read is the output value and not the DAC register
value. The LAT pin transition causes an update of the
output value. Based on the DAC output value, the
DACx register value, and the Command bit where the
LAT pin transitions, the value being read could be
corrupted.
The first 7-bits of the Read command determine the
address and the command. The 8th clock will output
the CMDERR bit on the SDO pin. By means of the
remaining 16 clocks, the device will transmit the data
bits of the specified address (AD4:AD0).
If LAT pin transitions occur during a read of the DACx
register, it is recommended that sequential reads be
performed until the two most recent read values match.
Then the most recent read data is good.
The Readcommand formats include:
• Single Read
• Continuous Reads
7.2.2
SINGLE READ
The Readcommand operation requires that the CS pin
be in the active state (VIL). Typically, the CS pin will be
Note 1: During device communication, if the
Device Address/Command combination
is invalid or an unimplemented Address is
specified, then the MCP48FVBXX will
command error that byte. To reset the
SPI state machine, the CS pin must be
driven to the VIH state.
in the inactive state (VIH) and is driven to the active
state (VIL). The 24-bit Readcommand (Command Byte
and Data Byte) is then clocked in on the SCK and SDI
pins. The SDO pin starts driving data on the 8th bit
(CMDERR bit), and the addressed data comes out on
the 9th through 24th clocks.
2: If the LAT pin is High (VIH), reads of the
volatile DAC Register address returns
that DAC’s output value, not the internal
register.
3: Read commands ignore any High Volt-
age Command levels that are present on
the HVC pin.
Address
Command
Data bits (8, 10, or 12 bits)
A
D
4
A
D
3
A
D
2
A
D
1
A
D
0
1
1
C
M
D
E
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
SDI
R
R
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
1
0
d
0
d
0
d
0
d
0
d
0
d
0
d
0
d
0
d
0
d
0
d
0
d
0
Valid (1)
Invalid (2, 3)
SDO
Note 1: If a valid Address/Command occurs, then the data bits are dependent on the resolution of the device.
12-bit = D11:D00, 10-bit = D09:D00, and 8-bit = D07:D00. Data is right justified for ease of Host Controller
operation (i.e., no data manipulation before transmitting the desired value).
2: Unimplemented data bits (D15:D12 on 12-bit device, D15:D10 on 10-bit device, D15:D08 on 8-bit device)
will be output as ‘1’.
3: If an Error condition occurs (CMDERR = L), all following SDO bits will be low until the CMDERR condition
is cleared (the CS pin is forced to the inactive state).
FIGURE 7-6:
Read Command - SDI and SDO States.
2015 Microchip Technology Inc.
DS20005466A-page 57
MCP48FVBXX
Figure 7-7 shows the sequence for three continuous
reads. The reads do not need to be to the same
memory address.
7.2.3
CONTINUOUS READS
Continuous-reads format allows the device’s memory
to be read quickly. Continuous reads are possible to all
memory locations.
Address
Command
Data bits (8, 10, or 12 bits)
A
SDI D
4
A
D
3
A
D
2
A
D
1
A
D
0
1
1
C
M
D
E
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
R
R
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Valid (1)
Invalid (2, 3)
SDO
1
Address
Command
Data bits (8, 10, or 12 bits)
A
D
4
A
D
3
A
D
2
A
D
1
A
D
0
1
1
C
M
D
E
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
SDI
R
R
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
(4)
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Valid (1)
Invalid (2, 3)
SDO
Address
Command
Data bits (8, 10, or 12 bits)
A
D
4
A
D
3
A
D
2
A
D
1
A
D
0
1
1
C
M
D
E
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
SDI
R
R
SDO 1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
(4)
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Valid (1)
Invalid (2, 3)
Note 1: If a valid Address/Command occurs, then the data bits are dependent on the resolution of the device.
12-bit = D11:D00, 10-bit = D09:D00, and 8-bit = D07:D00. Data is right justified for ease of Host Controller
operation (i.e., no data manipulation before transmitting the desired value).
2: Unimplemented data bits (D15:D12 on 12-bit device, D15:D10 on 10-bit device, D15:D08 on 8-bit device)
will be output as ‘1’.
3: If an Error condition occurs (CMDERR = L), all following SDO bits will be low until the CMDERR condition
is cleared (the CS pin is forced to the inactive state).
4: This CMDERR bit will be forced to ‘0’, regardless if this Address+Command combination is valid. This
command will not be completed and requires the CS pin to return to VIH to clear the CMDERR condition.
FIGURE 7-7:
Continuous-Reads Sequence.
DS20005466A-page 58
2015 Microchip Technology Inc.
MCP48FVBXX
HVC (1)
CS
VIH
VIL
SCK
PIC Write to
SSPBUF
CMDERR bit
SDO
SDI
bit23 bit22 bit21 bit20 bit19 bit18 bit17 bit16 bit15
bit1
bit0
AD4 AD3 AD2 AD1 AD0
D16 D15
bit16 bit15
D1
D0
bit23 bit22 bit21 bit20
bit19
bit1
bit0
1
1
Input
Sample
Note 1: If the state of the HVC pin is VIHH, then the command is ignored, but a Command Error condition (CMDERR) will NOT be generated.
FIGURE 7-8:
24-Bit Read Command (C1:C0 = “11”) - SPI Waveform with PIC MCU (Mode 1,1).
HVC (1)
CS
VIH
VIL
SCK
PIC Write to
SSPBUF
CMDERR bit
SDO
SDI
bit23 bit22 bit21 bit20 bit19 bit18 bit17 bit16 bit15
bit1
bit0
AD4 AD3 AD2 AD1 AD0
bit23 bit22 bit21 bit20 bit19
D16 D15
bit16 bit15
D1
bit1
D0
bit0
1
1
Input
Sample
Note 1: If the state of the HVC pin is VIHH, then the command is ignored, but a Command Error condition (CMDERR) will NOT be generated.
FIGURE 7-9:
24-Bit Read Command (C1:C0 = “11”) - SPI Waveform with PIC MCU (Mode 0,0).
2015 Microchip Technology Inc.
DS20005466A-page 59
MCP48FVBXX
NOTES:
DS20005466A-page 60
2015 Microchip Technology Inc.
MCP48FVBXX
8.0
TYPICAL APPLICATIONS
The MCP48FVBXX devices are general purpose,
single/dual-channel voltage output DACs for various
applications where a precision operation with low power
and volatile memory is needed.
VDD
SDI
V
1
2
3
10
9
DD
C1
C2 CS
SCK
SDO
To MCU
VREF
8
Applications generally suited for the devices are:
VOUT0
4
5
7
6
VSS
Analog
Output
• Set Point or Offset Trimming
• Sensor Calibration
VOUT1
LAT/HVC
MCP48FVBX2
C3
C4
• Portable Instrumentation (Battery-Powered)
• Motor Control
Optional
(a) Circuit when VDD is selected as reference
8.1
Power Supply Considerations
(Note: V is connected to the reference circuit internally.)
DD
V
DD
The power source should be as clean as possible. The
power supply to the device is also used for the DAC
voltage reference internally if the internal VDD is
selected as the resistor ladder’s reference voltage
(VRxB:VRxA = ‘00’).
C1
C2
SDI
1
2
3
10
9
VDD
CS
SCK
SDO
VREF
To MCU
Any noise induced on the VDD line can affect the DAC
performance. Typical applications will require a bypass
capacitor in order to filter out high-frequency noise on
the VDD line. The noise can be induced onto the power
supply’s traces or as a result of changes on the DAC
output. The bypass capacitor helps to minimize the
effect of these noise sources on signal integrity.
Figure 8-1 shows an example of using two bypass
capacitors (a 10 µF tantalum capacitor and a 0.1 µF
ceramic capacitor) in parallel on the VDD line. These
capacitors should be placed as close to the VDD pin as
possible (within 4 mm). If the application circuit has
separate digital and analog power supplies, the VDD
and VSS pins of the device should reside on the analog
plane.
8
VREF
C5
Optional
VOUT0
C6
4
5
7
6
VSS
VOUT1
LAT/HVC
Analog
Output
MCP48FVBX2
C3
C4
Optional
(b) Circuit when external reference is used.
C : 0.1 µF capacitor
Ceramic
1
C : 10 µF capacitor
Tantalum
2
C : ~ 0.1 µF
Optional to reduce noise
3
in V
pin
OUT
C : 0.1 µF capacitor
Ceramic
4
C : 10 µF capacitor
Tantalum
Ceramic
5
C : 0.1 µF capacitor
6
FIGURE 8-1:
Bypass Filtering Example
Circuit.
2015 Microchip Technology Inc.
DS20005466A-page 61
MCP48FVBXX
8.2.1.1
Decreasing Output Step Size
8.2
Application Examples
If the application is calibrating the bias voltage of a
diode or transistor, a bias voltage range of 0.8V may be
desired with about 200 µV resolution per step. Two
common methods to achieve small step size are:
The MCP48FVBXX devices are rail-to-rail output DACs
designed to operate with a VDD range of 2.7V to 5.5V.
The internal output operational amplifier is robust
enough to drive common, small-signal loads directly,
thus eliminating the cost and size of external buffers for
most applications. The user can use gain of 1 or 2 of
the output operational amplifier by setting the
Configuration register bits. Also, the user can use
internal VDD as the reference or use an external
reference. Various user options and easy-to-use
features make the devices suitable for various modern
DAC applications.
• Using lower VREF pin voltage: Using an external
voltage reference (VREF) is an option if the
external reference is available with the desired
output voltage range. However, occasionally,
when using a low-voltage reference voltage, the
noise floor causes a SNR error that is intolerable.
• Using a voltage divider on the DAC’s output:
Using
a
voltage divider provides some
advantages when external voltage reference
needs to be very low or when the desired output
voltage is not available. In this case, a larger
value reference voltage is used while two
resistors scale the output range down to the
precise desired level.
Application examples include:
• Decreasing Output Step Size
• Building a “Window” DAC
• Bipolar Operation
• Selectable Gain and Offset Bipolar Voltage Output
• Designing a Double-Precision DAC
• Building Programmable Current Source
• Serial Interface Communication Times
• Power Supply Considerations
• Layout Considerations
Figure 8-2 illustrates this concept. A bypass capacitor
on the output of the voltage divider plays a critical
function in attenuating the output noise of the DAC and
the induced noise from the environment.
VDD
8.2.1
DC SET POINT OR CALIBRATION
A
common application for the devices is
a
digitally-controlled set point and/or calibration of
variable parameters, such as sensor offset or slope.
For example, the MCP48FVB2X provides 4096 output
steps. If voltage reference is 4.096V (where Gx = ‘0’),
the LSb size is 1 mV. If a smaller output step size is
desired, a lower external voltage reference is needed.
Optional
RSENSE
VREF VDD
VCC
+
VOUT
-
R1
VTRIP
Comp.
+
MCP48FVBXX
VO
C1
VCC
–
R2
SPI
4-wire
FIGURE 8-2:
Example Circuit Of
Set-Point or Threshold Calibration.
EQUATION 8-1: OUT AND VTRIP
V
CALCULATIONS
DAC Register Value
VOUT = VREF • G •
2N
R
2
V
= V
--------------------
trip
OUT
R + R
1
2
DS20005466A-page 62
2015 Microchip Technology Inc.
MCP48FVBXX
8.2.1.2
Building a “Window” DAC
8.3
Bipolar Operation
When calibrating a set point or threshold of a sensor,
typically only a small portion of the DAC output range is
utilized. If the LSb size is adequate enough to meet the
application’s accuracy needs, the unused range is
sacrificed without consequences. If greater accuracy is
needed, then the output range will need to be reduced
to increase the resolution around the desired threshold.
Bipolar operation is achievable by utilizing an external
operational amplifier. This configuration is desirable
due to the wide variety and availability of op amps. This
allows a general purpose DAC, with its cost and
availability advantages, to meet almost any desired
output voltage range, power and noise performance.
Figure 8-4 illustrates a simple bipolar voltage source
configuration. R1 and R2 allow the gain to be selected,
while R3 and R4 shift the DAC's output to a selected
offset. Note that R4 can be tied to VDD instead of VSS if
a higher offset is desired.
If the threshold is not near VREF, 2 VREF, or VSS, then
creating a “window” around the threshold has several
advantages. One simple method to create this “window”
is to use a voltage divider network with a pull-up and
pull-down resistor. Figures 8-3 and 8-5 illustrate this
concept.
Optional
VREF
VDD
VCC
+
Optional
VCC
+
RSENSE
R3
VOUT
VOA+
C1
VREF
VDD
VCC
+
VO
MCP48FVBXX
R3
R2
-
VO
R4
R1
VTRIP Comp.
MCP48FVBXX
SPI
4-wire
VCC
–
+
VOUT
C1
VCC
–
R2
SPI
4-wire
VIN
VCC–
R1
FIGURE 8-3:
Single-Supply “Window”
FIGURE 8-4:
Digitally-Controlled Bipolar
DAC.
Voltage Source Example Circuit.
EQUATION 8-2:
V
OUT AND VTRIP
EQUATION 8-3: OUT, VOA+, AND VO
V
CALCULATIONS
CALCULATIONS
DAC Register Value
2N
DAC Register Value
VOUT = VREF • G •
VOUT = VREF • G •
2N
VOUTR23 + V23R1
VTRIP = --------------------------------------------
R1 + R23
VOUT • R4
R3 + R4
VOA+
=
R2R3
R23 = ------------------
R2 + R3
R2
R1
R2
R1
VO = VOA+ • (1 +
) - VDD • (
)
Thevenin
Equivalent
VCC+R2 + VCC-R3
V23 = ------------------------------------------------------
R2 + R3
R1
VOUT
VTRIP
R23
V23
2015 Microchip Technology Inc.
DS20005466A-page 63
MCP48FVBXX
8.4
Selectable Gain and Offset Bipolar
Voltage Output
Optional
VCC
+
In some applications, precision digital control of the
output range is desirable. Figure 8-5 illustrates how to
use DAC devices to achieve this in a bipolar or
single-supply application.
Optional
VREF VDD
R5
VCC+
R3
VOA+
C1
This circuit is typically used for linearizing a sensor
whose slope and offset varies.
VOUT
MCP48FVBXX
VO
R4
VCC
VIN
The equation to design a bipolar “window” DAC would
be utilized if R3, R4 and R5 are populated.
SPI
4-wire
VCC
–
–
Bipolar DAC Example
R2
An output step size of 1 mV with an output range of
±2.05V is desired for a particular application.
R1
Step 1: Calculate the range: +2.05V – (-2.05V) = 4.1V.
Step 2: Calculate the resolution needed:
4.1V/1 mV = 4100
C1 = 0.1 µF
FIGURE 8-5:
Bipolar Voltage Source with
Selectable Gain and Offset.
12
Since 2 = 4096, 12-bit resolution is desired.
Step 3: The amplifier gain (R2/R1), multiplied by
full-scale VOUT (4.096V), must be equal to
the desired minimum output to achieve
bipolar operation. Since any gain can be
realized by choosing resistor values
(R1 + R2), the VREF value must be selected
first. If a VREF of 4.096V is used, solve for
the amplifier’s gain by setting the DAC to 0,
knowing that the output needs to be -2.05V.
EQUATION 8-6: OUT, VOA+, AND VO
V
CALCULATIONS
DAC Register Value
VOUT = VREF • G •
2N
VOUT • R4 + VCC- • R5
R3 + R4
VOA+
=
The equation can be simplified to:
R2
R2
R1
VO = VOA+ • ( 1 +
) - VIN • (
)
EQUATION 8-4:
R1
–R2
-------- = ----------------
R1 4.096V
R2
----- = --
R1
–2.05
1
2
Offset Adjust
Gain Adjust
If R1 = 20 k and R2 = 10 k, the gain will be 0.5.
EQUATION 8-7:
BIPOLAR “WINDOW” DAC
USING R4 AND R5
Step 4: Next, solve for R3 and R4 by setting the
DAC to 4096, knowing that the output
needs to be +2.05V.
VCC+R4 + VCC-R5
Thevenin
Equivalent
V45 = --------------------------------------------
R4 + R5
EQUATION 8-5:
VOUTR45 + V45R3
VIN+ = --------------------------------------------
R3 + R45
R4
2.05V + 0.5 4.096V
2
3
----------------------- = ------------------------------------------------------- = --
R3 + R4
1.5 4.096V
R4R5
R45 = ------------------
R4 + R5
If R4 = 20 k, then R3 = 10 k
R2
R2
R1
VO = VIN+ 1 + ----- – VA -----
R1
Offset Adjust Gain Adjust
DS20005466A-page 64
2015 Microchip Technology Inc.
MCP48FVBXX
8.5
Designing a Double-Precision
DAC
8.6
Building Programmable Current
Source
Figure 8-6 shows an example design of a single-supply
voltage output capable of up to 24-bit resolution. This
requires two 12-bit DACs. This design is simply a
voltage divider with a buffered output.
Figure 8-7 shows an example of building
a
programmable current source using a voltage follower.
The current sensor resistor is used to convert the DAC
voltage output into a digitally-selectable current source.
Double-Precision DAC Example
The smaller RSENSE is, the less power dissipated
across it. However, this also reduces the resolution that
the current can be controlled.
If a similar application to the one developed in Bipolar
DAC Example required a resolution of 1 µV instead of
1 mV and a range of 0V to 4.1V, then 12-bit resolution
would not be adequate.
VDD
(or VREF
)
Optional
VREF
Step1: Calculate the resolution needed:
VDD
4.1V/1 µV = 4.1 x 106.
Load
Since 222 = 4.2 x 106, 22-bit resolution is
desired. Since DNL = ±1.0 LSb, this design
can be attempted with the 12-bit DAC.
VCC+
VOUT
IL
MCP48FVBXX
Step2: Since DAC1’s VOUT1 has a resolution of
1 mV, its output only needs to be “pulled”
1/1000 to meet the 1 µV target. Dividing
VOUT0 by 1000 would allow the application
to compensate for DAC1’s DNL error.
Ib
VCC–
SPI
4-wire
IL
Ib = ----
RSENSE
Step3: If R2 is 100, then R1 needs to be 100 k.
Step4: The resulting transfer function is shown in
VOUT
IL = ------------------ ------------
RSENSE + 1
Equation 8-8.
where Common-Emitter Current Gain
Optional
VDD
VREF
FIGURE 8-7:
Digitally-Controlled Current
Source.
VOUT0
R1
MCP48FVBX2
(DAC0)
SPI
4-wire
VCC+
VOUT
Optional
VREF VDD
0.1 µF
R2
VOUT1
VCC
–
MCP48FVBX2
(DAC1)
SPI
4-wire
FIGURE 8-6:
Simple Double-Precision
DAC using MCP48FVBX2.
EQUATION 8-8: OUT CALCULATION
V
V
OUT0 • R2 + VOUT1 • R1
VOUT
=
R1 + R2
Where:
VOUT0 = (VREF • G • DAC0 Register Value)/4096
VOUT1 = (VREF • G • DAC1 Register Value)/4096
Gx = Selected Op Amp Gain
2015 Microchip Technology Inc.
DS20005466A-page 65
MCP48FVBXX
8.7
Serial Interface Communication
Times
Table 8-1 shows time/frequency of the supported
operations of the SPI serial interface for the different
serial interface operational frequencies. This, along
with the VOUT output performance (such as slew rate),
would be used to determine your application’s volatile
DAC register update rate.
TABLE 8-1:
SERIAL INTERFACE TIMES / FREQUENCIES
Command
Data Update Rate
(8-bit/10-bit/12-bit)
(Data Words/Second)
Code
# of Bit
Comments
Clocks(1)
Operation
Mode
C
1
C
0
1 MHz
10 MHz
20 MHz (2)
0
0
1
1
0
0
1
1
Single
24
41,666
41,666
41,666
41,666
416,666
416,666
416,666
416,666
833,333
833,333
N.A.
Write Command
Read Command
Continuous
Single
24n
24
For 10 data words
For 10 data words
Continuous
24n
N.A.
Note 1: “n” indicates the number of times the command operation is to be repeated.
2: Writecommand only.
DS20005466A-page 66
2015 Microchip Technology Inc.
MCP48FVBXX
8.8.2
LAYOUT CONSIDERATIONS
8.8
Design Considerations
Several layout considerations may be applicable to
your application. These may include:
In the design of a system with the MCP48FVBXX
devices, the following considerations should be taken
into account:
• Noise
• PCB Area Requirements
• Power Supply Considerations
• Layout Considerations
8.8.2.1
Noise
8.8.1
POWER SUPPLY
CONSIDERATIONS
Inductively-coupled AC transients and digital switching
noise can degrade the input and output signal integrity,
potentially masking the MCP48FVBXX’s performance.
Careful board layout minimizes these effects and
increases the Signal-to-Noise Ratio (SNR). Multi-layer
The typical application will require a bypass capacitor
in order to filter high-frequency noise which can be
induced onto the power supply's traces. The bypass
capacitor helps to minimize the effect of noise sources
on signal integrity. Figure 8-8 illustrates an appropriate
bypass strategy.
boards utilizing
a low-inductance ground plane,
isolated inputs, isolated outputs and proper decoupling
are critical to achieving the performance that the silicon
is capable of providing. Particularly harsh
environments may require shielding of critical signals.
In this example, the recommended bypass capacitor
value is 0.1 µF. This capacitor should be placed as close
(within 4 mm) to the device power pin (VDD) as possible.
Separate digital and analog ground planes are
recommended. In this case, the VSS pin and the ground
pins of the VDD capacitors should be terminated to the
analog ground plane.
The power source supplying these devices should be
as clean as possible. If the application circuit has
separate digital and analog power supplies, VDD and
VSS should reside on the analog plane.
Note:
Breadboards and wire-wrapped boards
are not recommended.
VDD
8.8.2.2
PCB Area Requirements
In some applications, PCB area is a criteria for device
selection. Table 8-2 shows the typical package
dimensions and area for the 10-lead MSOP package.
0.1 µF
VDD
)
PACKAGE FOOTPRINT (
Package Footprint
Dimensions
1
TABLE 8-2:
Package
0.1 µF
(mm)
Type
Code
Area (mm2)
SDI
Length Width
VREF
VOUT
SDO
SCK
CS
10 MSOP
UN
3.00
4.90
14.70
Note 1: Does not include recommended land
pattern dimensions. Dimensions are
typical values.
VSS
VSS
FIGURE 8-8:
Typical Microcontroller
Connections.
2015 Microchip Technology Inc.
DS20005466A-page 67
MCP48FVBXX
NOTES:
DS20005466A-page 68
2015 Microchip Technology Inc.
MCP48FVBXX
9.0
DEVELOPMENT SUPPORT
Development support can be classified into two groups.
These are:
• Development Tools
• Technical Documentation
9.1
Development Tools
The MCP48FVBXX devices currently do not have any
development tools or bond-out boards. Please visit the
Device's web product page (Development Tools tab) for
the development tools availability after the release of
this data sheet.
9.2
Technical Documentation
Several additional technical documents are available to
assist you in your design and development. These
technical documents include Application Notes,
Technical Briefs, and Design Guides. Table 9-1 lists
some of these documents.
TABLE 9-1:
TECHNICAL DOCUMENTATION
Application
Note Number
Title
Literature #
AN1326
Using the MCP4728 12-Bit DAC for LDMOS Amplifier Bias Control Applications
Signal Chain Design Guide
DS01326
DS21825
DS01005
—
—
Analog Solutions for Automotive Applications Design Guide
2015 Microchip Technology Inc.
DS20005466A-page 69
MCP48FVBXX
NOTES:
DS20005466A-page 70
2015 Microchip Technology Inc.
MCP48FVBXX
10.0 PACKAGING INFORMATION
10.1 Package Marking Information
10-Lead MSOP
Example
48FV01
548256
Device Number
Code
Device Number
Code
MCP48FVB01-E/UN
48FV01 MCP48FVB02-E/UN
48FV02
MCP48FVB01T-E/UN 48FV01 MCP48FVB02T-E/UN 48FV02
MCP48FVB11-E/UN
MCP48FVB11T-E/UN
MCP48FVB21-E/UN
48FV11 MCP48FVB12-E/UN
48FV11 MCP48FVB12T-E/UN 48FV12
48FV21 MCP48FVB22-E/UN 48FV22
48FV12
MCP48FVB21T-E/UN 48FV21 MCP48FVB22T-E/UN 48FV22
Legend: XX...X Customer-specific information
Y
Year code (last digit of calendar year)
YY
WW
NNN
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator (
can be found on the outer packaging for this package.
e
3
*
)
e
3
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
2015 Microchip Technology Inc.
DS20005466A-page 71
MCP48FVBXX
UN
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS20005466A-page 72
2015 Microchip Technology Inc.
MCP48FVBXX
UN
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2015 Microchip Technology Inc.
DS20005466A-page 73
MCP48FVBXX
10-Lead Plastic Micro Small Outline Package (UN) [MSOP]
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS20005466A-page 74
2015 Microchip Technology Inc.
MCP48FVBXX
APPENDIX A: REVISION HISTORY
Revision A (December 2015)
• Original release of this document.
2015 Microchip Technology Inc.
DS20005466A-page 75
MCP48FVBXX
B.3
Monotonic Operation
APPENDIX B: TERMINOLOGY
Monotonic operation means that the device’s output
voltage (VOUT) increases with every 1 code step (LSb)
increment (from VSS to the DAC’s reference voltage
(VDD or VREF)).
B.1
Resolution
Resolution is the number of DAC output states that
divide the full-scale range. For the 12-bit DAC, the
resolution is 212, meaning the DAC code ranges from
0 to 4095.
VS64
40h
3Fh
When there are 2N resistors in the resistor
ladder and 2N tap points, the full-scale
DAC register code is the resistor element
(1 LSb) from the source reference voltage
(VDD or VREF).
VS63
Note:
3Eh
VS3
03h
02h
B.2
Least Significant Bit (LSb)
VS1
This is the voltage difference between two successive
codes. For a given output voltage range, it is divided by
the resolution of the device (Equation B-1). The range
may be VDD (or VREF) to VSS (ideal), the DAC register
codes across the linear range of the output driver
(Measured 1), or full-scale to zero-scale (Measured 2).
VS0
01h
00h
VW (@ tap)
n = ?
VW
=
VSn + VZS(@ Tap 0)
n = 0
EQUATION B-1:
LSb VOLTAGE
CALCULATION
Voltage (VW ~= VOUT
)
FIGURE B-1:
VW (VOUT).
Ideal
VLSb(IDEAL)
VDD
2N
VREF
2N
=
or
Measured 1
V
OUT(@4000) - VOUT(@100)
VLSb(Measured)
=
(4000 - 100)
Measured 2
V
OUT(@FS) - VOUT(@ZS)
VLSb
=
2N - 1
2N = 4096 (MCP48FXB2X)
= 1024 (MCP48FXB1X)
=
256 (MCP48FXB0X)
DS20005466A-page 76
2015 Microchip Technology Inc.
MCP48FVBXX
B.4
Full-Scale Error (E )
B.6
Total Unadjusted Error (E )
T
FS
The Full-Scale Error (see Figure B-3) is the error on
the VOUT pin relative to the expected VOUT voltage
(theoretical) for the maximum device DAC register
code (code FFFh for 12-bit, code 3FFh for 10-bit, and
code FFh for 8-bit) (see Equation B-2). The error is
dependent on the resistive load on the VOUT pin (and
where that load is tied to, such as VSS or VDD). For
loads (to VSS) greater than specified, the full-scale
error will be greater.
The Total Unadjusted Error (ET) is the difference
between the ideal and measured VOUT voltage.
Typically, calibration of the output voltage is
implemented to improve system performance.
The error in bits is determined by the theoretical voltage
step size to give an error in LSb.
Equation B-4 shows the Total Unadjusted Error
calculation.
The error in bits is determined by the theoretical voltage
step size to give an error in LSb.
EQUATION B-4:
TOTAL UNADJUSTED
ERROR CALCULATION
EQUATION B-2:
FULL-SCALE ERROR
( VOUT_Actual(@code) - VOUT_Ideal(@Code)
)
ET =
V
- V
VLSb(Ideal)
OUT(@FS)
IDEAL(@FS)
E
=
FS
V
Where:
ET is expressed in LSb.
LSb(IDEAL)
Where:
EFS is expressed in LSb.
VOUT_Actual(@code) = The measured DAC output
voltage at the specified code.
VOUT(@FS) = The VOUT voltage when the DAC
register code is at full-scale.
VOUT_Ideal(@code) = The calculated DAC output
voltage at the specified code.
VIDEAL(@FS) = The ideal output voltage when the
DAC register code is at full-scale.
( code * VLSb(Ideal)
)
VLSb(Ideal) = VREF/# Steps
VLSb(IDEAL) = The theoretical voltage step size.
12-bit = VREF/4096
10-bit = VREF/1024
8-bit = VREF/ 256
B.5
Zero-Scale Error (E )
ZS
The Zero-Scale Error (see Figure B-2) is the difference
between the ideal and the measured VOUT voltage with
the DAC register code equal to 000h (Equation B-3).
The error is dependent on the resistive load on the
VOUT pin (and where that load is tied to, such as VSS or
VDD). For loads (to VDD) greater than specified, the
zero-scale error will be greater.
The error in bits is determined by the theoretical voltage
step size to give an error in LSb.
EQUATION B-3:
ZERO-SCALE ERROR
V
OUT(@ZS)
E
=
ZS
V
LSb(IDEAL)
Where:
ZS is expressed in LSb.
E
VOUT(@ZS) = The VOUT voltage when the DAC
register code is at zero-scale.
VLSb(IDEAL) = The theoretical voltage step size.
2015 Microchip Technology Inc.
DS20005466A-page 77
MCP48FVBXX
B.7
Offset Error (E
)
B.9
Gain Error (E )
G
OS
The offset error is the delta voltage of the VOUT voltage
from the ideal output voltage at the specified code.
This code is specified where the output amplifier is in
the linear operating range; for the MCP48FVBXX we
specify code 100 (decimal). Offset error does not
include gain error. Figure B-2 illustrates this.
Gain error is a calculation based on the ideal slope
using the voltage boundaries for the linear range of the
output driver (ex code 100 and code 4000) (see
Figure B-3). The gain error calculation nullifies the
device’s offset error.
Gain error indicates how well the slope of the actual
transfer function matches the slope of the ideal transfer
function. Gain error is usually expressed as percent of
full-scale range (% of FSR) or in LSb. FSR is the ideal
full-scale voltage of the DAC (see Equation B-5).
This error is expressed in mV. Offset error can be neg-
ative or positive. The offset error can be calibrated by
software in application circuits.
Gain Error (E )
G
(@ code = 4000)
Actual
Transfer
Function
V
REF
Actual
Transfer
Function
Full-Scale
Error (E
)
FS
Ideal Transfer
Function shifted by
Offset Error
(crosses at start of
defined linear range)
Zero-Scale
Ideal Transfer
Function
Error (E
)
ZS
Ideal Transfer
Function
0
100
4000
DAC Input Code
Offset
Error (E
0
100
4000 4095
DAC Input Code
)
OS
FIGURE B-3:
FULL-SCALE ERROR EXAMPLE.
GAIN ERROR AND
FIGURE B-2:
ZERO-SCALE ERROR.
OFFSET ERROR AND
EQUATION B-5:
EXAMPLE GAIN ERROR
B.8
Offset Error Drift (E
)
OSD
( VOUT(@4000) - VOS - VOUT_Ideal(@4000)
)
Offset error drift is the variation in offset error due to a
change in ambient temperature. Offset error drift is
typically expressed in ppm/oC or µV/oC.
EG
=
• 100
VFull-Scale Range
Where:
EG is expressed in % of full-scale range (FSR).
VOUT(@4000) = The measured DAC output
voltage at the specified code.
VOUT_Ideal(@4000) = The calculated DAC output
voltage at the specified code.
( 4000 * VLSb(Ideal)
)
VOS = Measured offset voltage.
VFull Scale Range = Expected full-scale output
value (such as the VREF
voltage).
B.10 Gain-Error Drift (E
)
GD
Gain-error drift is the variation in gain error due to a
change in ambient temperature. Gain error drift is
typically expressed in ppm/oC (of full-scale range).
DS20005466A-page 78
2015 Microchip Technology Inc.
MCP48FVBXX
B.11 Integral Nonlinearity (INL)
B.12 Differential Nonlinearity (DNL)
The Integral Nonlinearity (INL) error is the maximum
deviation of an actual transfer function from an ideal
transfer function (straight line) passing through the
defined end points of the DAC transfer function (after
offset and gain errors have been removed).
The Differential Nonlinearity (DNL) error (see
Figure B-5) is the measure of step size between codes
in actual transfer function. The ideal step size between
codes is 1 LSb. A DNL error of zero would imply that
every code is exactly 1 LSb wide. If the DNL error is less
than 1 LSb, the DAC guarantees monotonic output and
no missing codes. Equation B-7 shows how to calculate
the DNL error between any two adjacent codes in LSb.
In the MCP48FVBXX, INL is calculated using the
defined end points, DAC code 100 and code 4000.
INL can be expressed as
a
percentage of
full-scale range (FSR) or in LSb. INL is also called
Relative Accuracy. Equation B-6 shows how to
calculate the INL error in LSb and Figure B-4 shows an
example of INL accuracy.
EQUATION B-7:
DNL ERROR
( VOUT(code = n+1) - VOUT(code = n)
)
EDNL
=
- 1
VLSb(Measured)
Positive INL means higher VOUT voltage than ideal.
Negative INL means lower VOUT voltage than ideal.
Where:
DNL is expressed in LSb.
E
VOUT(Code = n) = The measured DAC output voltage
with a given DAC register code.
EQUATION B-6:
INL ERROR
( VOUT - VCalc_Ideal
)
VLSb(Measured) = For Measured:
(VOUT(4000) - VOUT(100))/3900
EINL
=
VLSb(Measured)
Where:
INL is expressed in LSb.
VCalc_Ideal = Code * VLSb(Measured) + VOS
E
VOUT(Code = n) = The measured DAC output
voltage with a given DAC
register code
7
DNL = 0.5 LSb
6
VLSb(Measured) = For Measured:
(VOUT(4000) - VOUT(100))/3900
5
DNL = 2 LSb
VOS = Measured offset voltage.
4
3
Analog
Output
(LSb)
2
1
0
7
INL = < -1 LSb
INL = - 1 LSb
6
5
000 001 010 011 100 101 110 111
DAC Input Code
Analog 4
Output
Ideal Transfer Function
Actual Transfer Function
INL = 0.5 LSb
3
2
1
0
(LSb)
FIGURE B-5:
DNL ACCURACY.
000 001 010 011 100 101 110 111
DAC Input Code
Ideal Transfer Function
Actual Transfer Function
FIGURE B-4:
INL ACCURACY.
2015 Microchip Technology Inc.
DS20005466A-page 79
MCP48FVBXX
B.13 Settling Time
B.17 Power-Supply Sensitivity (PSS)
Settling time is the time delay required for the VOUT
voltage to settle into its new output value. This time is
measured from the start of code transition to when the
PSS indicates how the output of the DAC is affected by
changes in the supply voltage. PSS is the ratio of the
change in VOUT to a change in VDD for mid-scale output
of the DAC. The VOUT is measured while the VDD is
varied from 5.5V to 2.7V as a step (VREF voltage held
constant), and expressed in %/%, which is the
% change of the DAC output voltage with respect to the
% change of the VDD voltage.
VOUT voltage is within the specified accuracy.
In the MCP48FVBXX, the settling time is a measure of
the time delay until the VOUT voltage reaches within
0.5 LSb of its final value, when the volatile DAC
Register changes from 1/4 to 3/4 of the full-scale range
(12-bit device: 400h to C00h).
EQUATION B-8:
PSS CALCULATION
B.14 Major-Code Transition Glitch
V
– V
OUT@5.5V
OUT@2.7V
----------------------------------------------------------------------------------
V
Major-Code transition glitch is the impulse energy
injected into the DAC analog output when the code in
the DAC register changes state. It is normally specified
as the area of the glitch in nV-Sec, and is measured
when the digital code is changed by 1 LSb at the major
carry transition.
OUT@5.5V
5.5V – 2.7V
---------------------------------
5.5V
PSS = ----------------------------------------------------------------------------------
Where:
PSS is expressed in %/%.
VOUT(@5.5V) = The measured DAC output
voltage with VDD = 5.5V.
Example: 011...111to 100...000
or 100...000to 011...111
VOUT(@2.7V) = The measured DAC output
voltage with VDD = 2.7V.
B.15 Digital Feedthrough
Digital feedthrough is the glitch that appears at the
analog output, caused by coupling from the digital input
pins of the device. The area of the glitch is expressed
in nV-Sec, and is measured with a full-scale change on
the digital input pins.
B.18 Power-Supply Rejection Ratio
(PSRR)
PSRR indicates how the output of the DAC is affected
by changes in the supply voltage. PSRR is the ratio of
the change in VOUT to a change in VDD for full-scale
output of the DAC. The VOUT is measured while the
VDD is varied ± 10% (VREF voltage held constant), and
expressed in dB or µV/V.
Example: all 0s to all 1s and vice versa.
The digital feedthrough is measured when the DAC is
not being written to the output register.
B.16 -3 dB Bandwidth
B.19
V
Temperature Coefficient
OUT
This is the frequency of the signal at the VREF pin that
causes the voltage at the VOUT pin to fall -3 dB value
from a static value on the VREF pin. The output
decreases due to the RC characteristics of the resistor
ladder and the characteristics of the output buffer.
The VOUT Temperature Coefficient quantifies the error
in the resistor ladder’s resistance ratio (DAC Register
code value) and Output Buffer due to temperature drift.
B.20 Absolute Temperature Coefficient
The absolute temperature coefficient quantifies the
error in the end-to-end output voltage (Nominal output
voltage VOUT) due to temperature drift. For a DAC this
error is typically not an issue due to the ratiometric
aspect of the output.
B.21 Noise Spectral Density
Noise spectral density is a measurement of the
device’s internally-generated random noise, and is
characterized as a spectral density (voltage per √Hz).
It is measured by loading the DAC to the
mid-scale value and measuring the noise at the
VOUT pin. It is measured in nV/√Hz.
DS20005466A-page 80
2015 Microchip Technology Inc.
MCP48FVBXX
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
Examples:
(1)
PART NO.
Device
X
X
/XX
a) MCP48FVB01-E/UN:
8-bit VOUT resolution, Single
channel, Tube, Extended
temperature, 10-lead MSOP
package
Tape and Temperature Package
Reel
Range
b) MCP48FVB01T-E/UN:
8-bit VOUT resolution, Single
channel, Tape and Reel,
Extended temperature,
10-lead MSOP Package
Device:
MCP48FVB01: Single-Channel 8-Bit Volatile DAC
with External + Internal References
MCP48FVB02: Dual-Channel 8-Bit Volatile DAC
with External + Internal References
a) MCP48FVB11-E/UN:
b) MCP48FVB11T-E/UN:
10-bit VOUT resolution, Single
channel,
Tube,
Extended
MCP48FVB11: Single-Channel 10-Bit Volatile DAC
with External + Internal References
temperature,
package
10-lead MSOP
10-bit VOUT resolution, Single
channel, Tape and Reel,
Extended temperature,
MCP48FVB12: Dual-Channel 10-Bit Volatile DAC
with External + Internal References
10-lead MSOP package
MCP48FVB21: Single-Channel 12-Bit Volatile DAC
with External + Internal References
a) MCP48FVB21-E/UN:
b) MCP48FVB21T-E/UN:
12-bit VOUT resolution, Single
MCP48FVB22: Dual-Channel 12-Bit Volatile DAC
with External + Internal References
channel,
Tube,
Extended
temperature,
package
10-lead MSOP
12-bit VOUT resolution, Single
channel, Tape and Reel,
Extended temperature,
(1)
Tape and Reel: T
Blank
=
=
Tape and Reel
Tube
10-lead MSOP package
Temperature
Range:
E
=
-40°C to +125°C (Extended)
a) MCP48FVB22-E/UN:
b) MCP48FVB22T-E/UN:
12-bit VOUT resolution, Dual
channel,
Tube,
Extended
temperature,
package
10-lead MSOP
12-bit VOUT resolution, Dual
channel, Tape and Reel,
Extended temperature,
Package:
UN =
Plastic Micro Small Outline (MSOP),
10-Lead
10-lead MSOP package
Note 1:
Tape and Reel identifier only appears in the
catalog part number description. This identifier
is used for ordering purposes and is not
printed on the device package. Check with
your Microchip sales office for package
availability for the Tape and Reel option.
2015 Microchip Technology Inc.
DS20005466A-page 81
MCP48FVBXX
NOTES:
DS20005466A-page 82
2015 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights unless otherwise stated.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
FlashFlex, flexPWR, JukeBlox, KEELOQ, KEELOQ logo, Kleer,
LANCheck, MediaLB, MOST, MOST logo, MPLAB,
32
OptoLyzer, PIC, PICSTART, PIC logo, RightTouch, SpyNIC,
SST, SST Logo, SuperFlash and UNI/O are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
The Embedded Control Solutions Company and mTouch are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.
Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo,
CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit
Serial Programming, ICSP, Inter-Chip Connectivity, KleerNet,
KleerNet logo, MiWi, motorBench, MPASM, MPF, MPLAB
Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach,
Omniscient Code Generation, PICDEM, PICDEM.net, PICkit,
PICtail, RightTouch logo, REAL ICE, SQI, Serial Quad I/O,
Total Endurance, TSHARC, USBCheck, VariSense,
ViewSpan, WiperLock, Wireless DNA, and ZENA are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.
GestIC is a registered trademark of Microchip Technology
Germany II GmbH & Co. KG, a subsidiary of Microchip
Technology Inc., in other countries.
All other trademarks mentioned herein are property of their
respective companies.
© 2015, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
ISBN: 978-1-5224-0047-9
QUALITY MANAGEMENT SYSTEM
CERTIFIED BY DNV
Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
== ISO/TS 16949 ==
2015 Microchip Technology Inc.
DS20005466A-page 83
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China - Chongqing
Tel: 86-23-8980-9588
Fax: 86-23-8980-9500
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Japan - Tokyo
Tel: 81-3-6880- 3770
Fax: 81-3-6880-3771
China - Dongguan
Tel: 86-769-8702-9880
Italy - Venice
Tel: 39-049-7625286
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Hangzhou
Tel: 86-571-8792-8115
Fax: 86-571-8792-8116
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Korea - Seoul
Cleveland
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Hong Kong SAR
Tel: 852-2943-5100
Fax: 852-2401-3431
Poland - Warsaw
Tel: 48-22-3325737
Independence, OH
Tel: 216-447-0464
Fax: 216-447-0643
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Sweden - Stockholm
Tel: 46-8-5090-4654
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
Detroit
Novi, MI
UK - Wokingham
Tel: 44-118-921-5800
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
Tel: 248-848-4000
Fax: 44-118-921-5820
Houston, TX
Tel: 281-894-5983
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Indianapolis
Noblesville, IN
Tel: 317-773-8323
Fax: 317-773-5453
China - Shenzhen
Tel: 86-755-8864-2200
Fax: 86-755-8203-1760
Taiwan - Hsin Chu
Tel: 886-3-5778-366
Fax: 886-3-5770-955
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Kaohsiung
Tel: 886-7-213-7828
Taiwan - Taipei
Tel: 886-2-2508-8600
Fax: 886-2-2508-0102
New York, NY
Tel: 631-435-6000
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
San Jose, CA
Tel: 408-735-9110
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Canada - Toronto
Tel: 905-673-0699
Fax: 905-673-6509
07/14/15
DS20005466A-page 84
2015 Microchip Technology Inc.
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