AD5542ABCPZ-1 [ADI]
SERIAL INPUT LOADING, 1us SETTLING TIME, 16-BIT DAC, PDSO8, 3 X 3 MM, LFCSP-8;![AD5542ABCPZ-1](http://pdffile.icpdf.com/pdf2/p00230/img/icpdf/AD5542ABCPZ-_1347677_icpdf.jpg)
型号: | AD5542ABCPZ-1 |
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描述: | SERIAL INPUT LOADING, 1us SETTLING TIME, 16-BIT DAC, PDSO8, 3 X 3 MM, LFCSP-8 输入元件 光电二极管 转换器 |
文件: | 总24页 (文件大小:936K) |
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2.7 V to 5.5 V, Serial-Input, Voltage-Output,
16-/12-Bit nanoDACs in LFCSP
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
Low power, 1 LSB INL nanoDACs
AD5541A: 16 bits
AD5542A: 16 bits
AD5512A: 12 bits
2.7 V to 5.5 V single-supply operation
Low glitch: 1.1 nV-s
VLOGIC pin provides 1.8 V digital interface capability
Hardware CLR and LDAC functions
50 MHz SPI-/QSPI-/MICROWIRE-/DSP-compatible interface
standards
Power-on reset clears DAC output to zeroscale and midscale
Available in 3 mm × 3 mm 16-LFCSP, 10-LFCSP, and 8-LFCSP
Also available in10-MSOP and 16-TSSOP
Figure 1. AD5541A
APPLICATIONS
Automatic test equipment
Precision Source-measure Instruments
Data Acquisition Systems
Medical Instrumentation
Aerospace Instrumentation
Communications Infrastructure equipment
Industrial Control
GENERAL DESCRIPTION
Figure 2. AD5541A-1
The AD5541A/AD5542A/AD5512A1 are single, 16-/16-/12-bit,
serial input, unbuffered voltage output digital-to-analog conver-
ters (DACs) that operate from a single 2.7 V to 5.5 V supply.
The AD5541A/AD5542A/AD5512A utilize a versatile 3-wire
interface that is compatible with a 50 MHz SPI, QSPI™,
MICROWIRE™, and DSP interface standards.
These DACs provide 16-/12-bit performance without any adjust-
ments. The DAC output is unbuffered, which reduces power
consumption and offset errors contributed to by an output buffer.
The AD5542A/AD5512A can be operated in bipolar mode, which
generates a VREF output swing. The AD5542A/AD5512A also
includes Kelvin sense connections for the reference and analog
ground pins to reduce layout sensitivity.
The AD5541A is available in 10-lead 3 mm × 3 mm LFCSP and
10-lead MSSOP. The AD5541A-1 is available in 8-lead 3 mm ×
3 mm LFCSP. The AD5542A/AD5512A are available in 16-lead
3 mm × 3 mm LFCSP and the AD5542A is also available in
16-lead TSSOP. The AD5542A-1 is available in 10-lead LFCSP.
The AD5541A and AD5542A are specified over a temperature
range of −40°C to 105°C.
Figure 3. AD5542A
Rev. PrB
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2010 Analog Devices, Inc. All rights reserved.
AD5541A/AD5542A/AD5512A
Preliminary Technical Data
Figure 4.
1 All references to the AD5541A/AD5542A/AD5512A incorporate all models (see Ordering Guide) including the AD5541A-1/AD5542A-1 unless specified.
Rev. PrB | Page 2 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
TABLE OF CONTENTS
Features...............................................................................................1
Output Amplifier Selection .......................................................14
Force Sense Amplifier Selection ...............................................14
Reference and Ground ...............................................................14
Power-On Reset...........................................................................15
Power Supply and Reference Bypassing...................................15
Microprocessor Interfacing ...........................................................16
AD5541/AD5542 to ADSP-2101/ADSP-2103 Interface........16
AD5541/AD5542 to 68HC11/68L11 Interface .......................16
AD5541/AD5542 to MICROWIRE Interface.........................16
AD5541/AD5542 to 80C51/80L51 Interface...........................16
Applications Information...............................................................17
Optocoupler Interface ................................................................17
Decoding Multiple AD5541/AD5542s.....................................17
Outline Dimensions........................................................................18
Ordering Guide ...........................................................................21
Applications .......................................................................................1
General Description..........................................................................1
Functional Block Diagrams .............................................................1
Revision History................................................................................3
Specifications .....................................................................................4
Timing Characteristics .................................................................5
Absolute Maximum Ratings ............................................................6
Pin Configurations and Function Descriptions............................7
Typical Performance Characteristics..............................................9
Terminology.....................................................................................12
Theory of Operation.......................................................................13
Digital-to-Analog Section..........................................................13
Serial Interface.............................................................................13
Unipolar Output Operation.......................................................13
Bipolar Output Operation..........................................................14
REVISION HISTORY
Rev. PrB | Page 3 of 24
AD5541A/AD5542A/AD5512A
SPECIFICATIONS
Preliminary Technical Data
VDD = 2.7 V to 5.5V, VREF = 2.5 V, AGND = DGND = 0 V. −40°C < TA < +105°C, unless otherwise noted.
Table 1.
Parameter
Min
Typ
Max
Unit
Test Condition
STATIC PERFORMANCE
AD5541A/AD5542A
Resolution
16
Bits
LSB
LSB
LSB
LSB
LSB
Relative Accuracy (INL)
0.5
0.5
0.5
0.5
1.0
2.0
4.0
1.0
1.5
L, C grades
B, J grades
A grade
Guaranteed monotonic
J grade
Differential Nonlinearity (DNL)
AD5512A
Resolution
12
Bits
Relative Accuracy (INL)
Differential Nonlinearity (DNL)
Gain Error
1.0
1.0
2
LSB
LSB
LSB
LSB
ppm/°C
LSB
LSB
0.5
TA = 25°C
TA = 25°C
3
Gain Error Temperature Coefficient
Zero Code Error
0.1
0.3
0.7
1.5
Zero Code Temperature Coefficient
AD5542A/AD5512A
0.05
ppm/°C
Bipolar Resistor Matching
1.000
0.0015
Ω/Ω
%
RFB/RINV, typically RFB = RINV = 28 kΩ
Ratio error
Bipolar Zero Offset Error
1
5
7
LSB
LSB
TA = 25°C
Bipolar Zero Temperature Coefficient
OUTPUT CHARACTERISTICS
0.2
ppm/°C
Output Voltage Range
0
VREF − 1 LSB
V
Unipolar operation
−VREF
+VREF − 1 LSB
V
μs
V/μs
nV-sec
nV-sec
kΩ
AD5542 bipolar operation
To 1/2 LSB of FS, CL = 10 pF
CL = 10 pF, measured from 0% to 63%
1 LSB change around the major carry
All 1s loaded to DAC, VREF = 2.5 V
Tolerance typically 20%
Output Voltage Settling Time
Slew Rate
Digital-to-Analog Glitch Impulse
Digital Feedthrough
1
10
1.1
0.2
6.25
DAC Output Impedance
Power Supply Rejection Ratio
DAC REFERENCE INPUT
Reference Input Range
Reference Input Resistance1
1.0
VDD
LSB
∆VDD 10%
2.0
9
7.5
V
kΩ
kΩ
Unipolar operation
AD5542, bipolar operation
LOGIC INPUTS
Input Current
1
0.8
μA
V
V
V
pF
V
Input Low Voltage, VINL
Input High Voltage, VINH
Input High Voltage, VINH
Input Capacitance2
Hysteresis Voltage2
REFERENCE
VDD = 2.7 V to 5.5 V
VDD = 4.5 V to 5.5 V
VDD = 2.7 V to 3.6 V
2.0
1.8
10
0.15
Reference −3 dB Bandwidth
Reference Feedthrough
Signal-to-Noise Ratio
Reference Input Capacitance
1.3
1
92
75
120
MHz
mV p-p
dB
pF
pF
All 1s loaded
All 0s loaded, VREF = 1 V p-p at 100 kHz
Code 0x0000
Code 0xFFFF
POWER REQUIREMENTS
Rev. PrB | Page 4 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
Parameter
Min
Typ
Max
5.5
Unit
V
Test Condition
VDD
2.7
IDD
VLOGIC
125
150
5.5
µA
V
1.8
ILOGIC
15
1.5
µA
mW
Power Dissipation
6.05
1 Reference input resistance is code-dependent, minimum at 0x8555.
2 Guaranteed by design, not subject to production test.
TIMING CHARACTERISTICS
VLOGIC = 1.8 V to 5.5 V V, VDD = 5V, VREF = 2.5 V, VINH = 90% of VLOGIC, VINL = 10% of VLOGIC, AGND = DGND = 0 V; −40°C < TA < +105°C,
unless otherwise noted.
Table 2.
Parameter1, 2
Limit
50
20
10
10
5
Unit
Description
fSCLK
t1
t2
MHz max
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
SCLK cycle frequency
SCLK cycle time
SCLK high time
t3
SCLK low time
t4
CS low to SCLK high setup
CS high to SCLK high setup
SCLK high to CS low hold time
SCLK high to CS high hold time
Data setup time
t5
7
t6
15
10
7
t7
t8
t9
5
Data hold time (VINH = 90% of VDD, VINL = 10% of VDD)
Data hold time (VINH = 3V, VINL = 0 V)
LDAC pulsewidth
t9
5
t10
t11
t12
t13
15
15
15
15
CS high to LDAC low setup
CS high time between active periods
CLR pulsewidth
1 Guaranteed by design and characterization. Not production tested
2 All input signals are specified with tR = tF = 1 ns/V and timed from a voltage level of (VINL + VINH)/2.
Figure 5. Timing Diagram
Rev. PrB | Page 5 of 24
AD5541A/AD5542A/AD5512A
Preliminary Technical Data
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Table 3.
Parameter
Rating
VDD to AGND
Digital Input Voltage to DGND
VOUT to AGND
−0.3 V to +6 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to +0.3 V
10 mA
AGND, AGNDF, AGNDS to DGND
Input Current to Any Pin Except Supplies
Operating Temperature Range
Industrial (A, B, C Versions)
Commercial (J, L Versions)
Storage Temperature Range
Maximum Junction Temperature (TJ max)
Package Power Dissipation
Thermal Impedance, θJA
SOIC (R-8)
−40°C to +85°C
0°C to 70°C
−65°C to +150°C
150°C
(TJ max − TA)/θJA
149.5°C/W
104.5°C/W
SOIC (R-14)
Lead Temperature, Soldering
Peak Temperature1
ESD(AD5541A)
260°C
5kV
ESD(AD5542A)
TBD
1 As per JEDEC Standard 20.
Rev. PrB | Page 6 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
REF
CS
1
2
3
4
8
7
6
5
GND
VDD
VOUT
CLR
VDD
VOUT
AGND
REF
1
2
3
4
5
10 VLOGIC
AD5541A-1
TO P VIEW
(Not to Scale)
9
8
7
6
DGND
LDAC
DIN
AD5541A
TO P VIEW
(Not to Scale)
SCLK
DIN
CS
SCLK
NC = NO CO NNECT
NC = NO CO NNECT
Figure 6. AD5541A-1 8-Lead LFCSP Pin Configuration
Figure 7. AD5541A 10-Lead LFCSP Pin Configuration
VDD
VOUT
AGND
REF
1
2
3
4
5
10 VLOGIC
9
8
7
6
DGND
LDAC
DIN
AD5541A
TOP VIEW
(Not to Scale)
CS
SCLK
NC = NO CONNECT
Figure 8. AD5541A 10-Lead MSOP Pin Configuration
Table 4. AD5541A Pin Function Descriptions
Pin No.
8-Lead
LFCSP
10-Lead 10-Lead
LFCSP
MSOP
Mnemonic Description
6
2
3
4
2
3
4
VOUT
AGND
REF
Analog Output Voltage from the DAC.
Ground Reference Point for Analog Circuitry.
Voltage Reference Input for the DAC. Connect to an external 2.5 V reference.
Reference can range from 2 V to VDD.
1
CS
2
3
5
6
5
6
Logic Input Signal. The chip select signal is used to frame the serial data input.
SCLK
Clock Input. Data is clocked into the input register on the rising edge of SCLK.
Duty cycle must be between 40% and 60%.
4
7
9
7
DIN
Serial Data Input. This device accepts 16-bit words. Data is clocked into the
input register on the rising edge of SCLK.
Digital Ground. Ground reference for digital circuitry.
Analog Supply Voltage, 5 V 10%.
Asynchronous Clear Input. The CLR input is falling edge sensitive. When CLR is
low, all LDAC pulses are ignored. When CLR is activated, the input register and
the DAC register are cleared to the model selectable midscale or zeroscale .
Logic Power Supply.
LDAC Input. When this input is taken low, the DAC register is simultaneously
updated with the contents of the input register.
9
1
DGND
VDD
7
5
CLR
10
8
10
8
VLOGIC
LDAC
Rev. PrB | Page 7 of 24
AD5541A/AD5542A/AD5512A
Preliminary Technical Data
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RFB
VDD
VLOGIC
INV
VOUT
AGNDF
AGNDS
REFS
REFF
NC
AD5542A
TO P VIEW
(Not to Scale)
DGND
LDAC
CLR
DIN
CS
SCLK
NC = NO CO NNECT
Figure 9. AD5542A-1 10-Lead LFCSP Pin Configuration
Figure 10. AD5542A 16-Lead TSSOP Pin Configuration
VOUT
1
12 DGND
11 LDAC
10 CLR
AD5542A
AGNDF 2
AGNDS 3
AD5512A
TO P
VIEW
4
9
DIN
REFS
NC = NO CO NNECT
(Not to Scale)
Figure 11. AD5542A 16-Lead LFCSP Pin Configuration
Table 5. AD5542A/AD5512A Pin Function Descriptions
Pin No.
10-Lead 16-Lead
16-Lead
LFCSP
LFCSP
TSSOP
Mnemonic Description
8
1
16
RFB
Feedback Resistor Pin. In bipolar mode, connect this pin to the external op
amp output.
6
2
3
4
5
1
2
3
4
VOUT
Analog Output Voltage from the DAC.
Ground Reference Point for Analog Circuitry (Force).
Ground Reference Point for Analog Circuitry (Sense).
Voltage Reference Input (Sense) for the DAC. Connect to an external 2.5 V
reference. Reference can range from 2 V to VDD.
AGNDF
AGNDS
REFS
6
5
REFF
Voltage Reference Input (Force) for the DAC. Connect to an external 2.5 V
reference. Reference can range from 2 V to VDD.
CS
2
3
8
9
6
8
Logic Input Signal. The chip select signal is used to frame the serial data input.
SCLK
Clock Input. Data is clocked into the input register on the rising edge of SCLK.
Duty cycle must be between 40% and 60%.
Asynchronous Clear Input. The CLR input is falling edge sensitive. When CLR is
low, all LDAC pulses are ignored. When CLR is activated, the input register and
the DAC register are cleared to the model selectable midscale or zeroscale .
Serial Data Input. This device accepts 16-bit words. Data is clocked into the
input register on the rising edge of SCLK.
CLR
5
4
11
10
12
10
9
DIN
11
LDAC
LDAC Input. When this input is taken low, the DAC register is simultaneously
updated with the contents of the input register.
13
14
12
13
DGND
INV
Digital Ground. Ground reference for digital circuitry.
Connected to the Internal Scaling Resistors of the DAC. Connect the INV pin
to external op amps inverting input in bipolar mode.
Analog Supply Voltage, 5 V 10%.
Logic Power Supply.
7
9
16
15
15
14
VDD
VLOGIC
Rev. PrB | Page 8 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
TYPICAL PERFORMANCE CHARACTERISTICS
0.50
0.50
V
V
= 5V
V
V
= 5V
DD
DD
= 2.5V
= 2.5V
REF
REF
0.25
0
0.25
0
–0.25
–0.50
–0.25
–0.50
–0.75
0
8192 16,384 24,576 32,768 40,960 49,152 57,344 65,536
0
8192 16,384 24,576 32,768 40,960 49,152 57,344 65,536
CODE
CODE
Figure 12. Integral Nonlinearity vs. Code
Figure 15. Differential Nonlinearity vs. Code
0.25
0.75
V
= 5V
V
= 5V
DD
DD
V
= 2.5V
V
= 2.5V
REF
REF
0
–0.25
–0.50
–0.75
0.50
0.25
0
–0.25
–1.00
–0.50
–60 –40 –20
0
20
40
60
80
100 120 140
–60 –40 –20
0
20
40
60
80
100 120 140
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 13. Integral Nonlinearity vs. Temperature
Figure 16. Differential Nonlinearity vs. Temperature
0.50
0.75
V
T
= 5V
V
= 2.5V
DD
= 25°C
REF
= 25°C
T
A
A
0.25
0
0.50
0.25
0
DNL
DNL
–0.25
–0.50
INL
–0.25
INL
–0.75
–0.50
2
3
4
5
6
7
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
REFERENCE VOLTAGE (V)
Figure 14. Linearity Error vs. Supply Voltage
Figure 17. Linearity Error vs. Reference Voltage
Rev. PrB | Page 9 of 24
AD5541A/AD5542A/AD5512A
Preliminary Technical Data
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
0.15
0.10
0.05
0
V
V
= 5V
V
V
= 5V
DD
DD
= 2.5V
= 2.5V
REF
REF
T
= 25°C
T = 25°C
A
A
–0.05
–0.10
–0.15
–40
25
85
–40
25
85
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 18. Gain Error vs. Temperature1
Figure 21. Zero-Code Error vs. Temperature1
2.0
1.5
1.0
0.5
0
132
130
128
126
124
122
120
118
116
T
= 25°C
V
V
= 5V
A
DD
= 2.5V
REF
T
= 25°C
A
REFERENCE VOLTAGE
V
= 5V
DD
SUPPLY VOLTAGE
= 2.5V
V
REF
0
1
2
3
VOLTAGE (V)
4
5
6
–40
25
85
TEMPERATURE (°C)
Figure 19. Supply Current vs. Temperature1
Figure 22. Supply Current vs. Reference Voltage or Supply Voltage
200
200
V
V
= 5V
DD
= 2.5V
REF
180
160
140
120
100
80
T
= 25°C
A
150
100
50
60
40
20
0
0
0
10,000 20,000 30,000 40,000 50,000 60,000 70,000
CODE (Decimal)
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21
DIGITAL INPUT VOLTAGE (V)
Figure 23. Reference Current vs. Code
Figure 20. Supply Current vs. Digital Input Voltage
Rev. PrB | Page 10 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
V
V
T
= 2.5V
= 5V
= 25°C
V
V
T
= 2.5V
REF
REF
= 5V
2µs/DIV
DD
= 25°C
DD
A
A
CS (5V/DIV)
100
100
DIN (5V/DIV)
10pF
50pF
100pF
200pF
V
(50mV/DIV)
OUT
10
10
V
(0.5V/DIV)
OUT
2µs/DIV
Figure 26. Large Signal Settling Time
Figure 24. Digital Feedthrough
1.236
1.234
1.232
1.230
1.228
1.226
1.224
5
V
V
= 2.5V
CS
REF
= 5V
0
DD
= 25°C
T
A
100
V
(1V/DIV)
OUT
–5
–10
–15
–20
–25
–30
V
(50mV/DIV)
OUT
V
OUT
GAIN = –216
1LSB = 8.2mV
10
0.5µs/DIV
–0.5
0
0.5
1.0
1.5
2.0
Figure 27. Small Signal Settling Time
TIME (ns)
Figure 25. Digital-to-Analog Glitch Impulse
1 Preliminary data gathered between -40˚C and 85˚C.
Rev. PrB | Page 11 of 24
AD5541A/AD5542A/AD5512A
TERMINOLOGY
Preliminary Technical Data
Digital-to-Analog Glitch Impulse
Relative Accuracy or Integral Nonlinearity (INL)
For the DAC, relative accuracy or INL is a measure of the
maximum deviation, in LSBs, from a straight line passing
through the endpoints of the DAC transfer function. A typical
INL vs. code plot is shown in Figure 12.
Digital-to-analog glitch impulse is the impulse injected into the
analog output when the input 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 input code is changed by
1 LSB at the major carry transition. A digital-to-analog glitch
impulse plot is shown in Figure 25.
Differential Nonlinearity (DNL)
DNL is the difference between the measured change and the
ideal 1 LSB change between any two adjacent codes. A specified
differential nonlinearity of 1 LSB maximum ensures mono-
tonicity. A typical DNL vs. code plot is shown in Figure 15.
Digital Feedthrough
Digital feedthrough is a measure of the impulse injected into
the analog output of the DAC from the digital inputs of the
DAC, but it is measured when the DAC output is not updated.
Gain Error
CS
is held high while the CLK and DIN signals are toggled. It
Gain error is the difference between the actual and ideal analog
output range, expressed as a percent of the full-scale range.
It is the deviation in slope of the DAC transfer characteristic
from ideal.
is specified in nV-sec and is measured with a full-scale code
change on the data bus, that is, from all 0s to all 1s and vice
versa. A typical digital feedthrough plot is shown in Figure 24.
Power Supply Rejection Ratio (PSRR)
Gain Error Temperature Coefficient
PSRR indicates how the output of the DAC is affected by changes
in the power supply voltage. Power-supply rejection ratio is
quoted in terms of percent change in output per percent change
in VDD for full-scale output of the DAC. VDD is varied by 10%.
Gain error temperature coefficient is a measure of the change
in gain error with changes in temperature. It is expressed in
ppm/°C.
Zero Code Error
Zero code error is a measure of the output error when zero code
is loaded to the DAC register.
Reference Feedthrough
Reference feedthrough is a measure of the feedthrough from the
VREF input to the DAC output when the DAC is loaded with all
0s. A 100 kHz, 1 V p-p is applied to VREF. Reference feedthrough
is expressed in mV p-p.
Zero Code Temperature Coefficient
This is a measure of the change in zero code error with a change
in temperature. It is expressed in mV/°C.
Rev. PrB | Page 12 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
THEORY OF OPERATION
The AD5541A/AD5542A/AD5512A are single, 16-bit, serial
input, voltage output DACs. They operate from a single supply
ranging from 2.7 V to 5 V and consume typically 125 µA with a
supply of 5 V. Data is written to these devices in a 16-bit word
format,
SERIAL INTERFACE
The AD5541A/AD5542A/AD5512A are controlled by a
versatile 3- or 4-wire serial interface that operates at clock rates
up to 25 MHz and is compatible with SPI, QSPI, MICROWIRE,
and DSP interface standards. The timing diagram is shown in
Figure 5. Input data is framed by the chip select input, . After
a high-to-low transition on , data is shifted synchronously
and latched into the input register on the rising edge of the
serial clock, SCLK. Data is loaded MSB first in 16-bit words.
After 16 data bits have been loaded into the serial input register,
a low-to-high transition on transfers the contents of the shift
register to the DAC. Data can be loaded to the part only while
is low.
via a 3- or 4-wire serial interface. To ensure a known power-up
state, these parts are designed with a power-on reset function.
In unipolar mode, the output is reset to 0 V; in bipolar mode,
the AD5542A/AD5542A output is set to −VREF. Kelvin sense
connections for the reference and analog ground are included
on the AD5542.
CS
CS
CS
DIGITAL-TO-ANALOG SECTION
CS
The DAC architecture consists of two matched DAC sections.
A simplified circuit diagram is shown in Figure 28. The DAC
architecture of the AD5541A/AD5542A/AD5512A is
segmented. The four MSBs of the 16-bit data-word are decoded
to drive 15 switches, E1 to E15. Each switch connects one of 15
matched resistors to either AGND or VREF. The remaining 12
bits of the data-word drive switches S0 to S11 of a 12-bit voltage
mode R-2R ladder network.
LDAC
The AD5542A/AD5512A has an
DAC latch to be updated asynchronously by bringing
function that allows the
LDAC
CS
LDAC
should be maintained high while
low after
goes high.
LDAC
data is written to the shift register. Alternatively,
tied permanently low to update the DAC synchronously. With
LDAC CS
can be
tied permanently low, the rising edge of loads the data to
the DAC.
R
R
V
OUT
UNIPOLAR OUTPUT OPERATION
2R
2R
S0
2R . . . . .
S1 . . . . .
2R
2R
E1
2R . . . . .
E2 . . . . .
2R
E15
These DACs are capable of driving unbuffered loads of 60 kΩ.
Unbuffered operation results in low supply current, typically
300 μA, and a low offset error. The AD5541A provides a
unipolar output swing ranging from 0 V to VREF. The AD5542
can be configured to output both unipolar and bipolar voltages.
Figure 29 shows a typical unipolar output voltage circuit. The
code table for this mode of operation is shown in Table 6.
S11
V
REF
FOUR MSBs DECODED
INTO 15 EQUAL SEGMENTS
12-BIT R-2R LADDER
Figure 28. DAC Architecture
5V
2.5V
With this type of DAC configuration, the output impedance
is independent of code, while the input impedance seen by
the reference is heavily code dependent. The output voltage is
dependent on the reference voltage, as shown in the following
equation:
10µF
0.1µF
0.1µF
SERIAL
INTERFACE
V
REF(REFF*) REFS*
DD
AD820/
OP196
CS
VREF × D
UNIPOLAR
OUTPUT
DIN
AD5541/AD5542
OUT
VOUT
where:
=
SCLK
LDAC*
2N
EXTERNAL
OP AMP
DGND
AGND
D is the decimal data-word loaded to the DAC register.
N is the resolution of the DAC.
*AD5542 ONLY.
Figure 29. Unipolar Output
For a reference of 2.5 V, the equation simplifies to the following:
Table 6. Unipolar Code Table
DAC Latch Contents
2.5 × D
VOUT
=
65,536
MSB
LSB
Analog Output
VREF × (65,535/65,536)
VREF × (32,768/65,536) = ½ VREF
VREF × (1/65,536)
0 V
1111 1111 1111 1111
1000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0000
This gives a VOUT of 1.25 V with midscale loaded, and 2.5 V
with full-scale loaded to the DAC.
The LSB size is VREF/65,536.
Rev. PrB | Page 13 of 24
AD5541A/AD5542A/AD5512A
Preliminary Technical Data
Assuming a perfect reference, the unipolar worst-case output
voltage can be calculated from the following equation:
Assuming a perfect reference, the worst-case bipolar output
voltage can be calculated from the following equation:
D
VOUT −UNI + VOS
2 + RD
− VREF
1 + RD
VOUT −UNI
=
×
VREF + VGE + VZSE + INL
VOUT−BIP
=
216
1 +
(
2 + RD
)
A
where:
OUT−UNI is unipolar mode worst-case output.
D is code loaded to DAC.
REF is reference voltage applied to the part.
GE is gain error in volts.
where:
V
V
V
V
OUT-BIP is the bipolar mode worst-case output
OUT−UNI is the unipolar mode worst-case output.
OS is the external op amp input offset voltage.
RD is the RFB and RINV resistor matching error.
A is the op amp open-loop gain.
V
V
V
ZSE is zero scale error in volts.
INL is integral nonlinearity in volts.
OUTPUT AMPLIFIER SELECTION
BIPOLAR OUTPUT OPERATION
For bipolar mode, a precision amplifier should be used and
supplied from a dual power supply. This provides the VREF
output. In a single-supply application, selection of a suitable op
amp may be more difficult as the output swing of the amplifier
does not usually include the negative rail, in this case, AGND.
This can result in some degradation of the specified performance
unless the application does not use codes near zero.
With the aid of an external op amp, the AD5542A can be confi-
gured to provide a bipolar voltage output. A typical circuit of
such operation is shown in Figure 30. The matched bipolar
offset resistors, RFB and RINV, are connected to an external op
amp to achieve this bipolar output swing, typically RFB = RINV
28 kΩ. Table 7 shows the transfer function for this output
operating mode. Also provided on the AD5542 are a set of
Kelvin connections to the analog ground inputs.
=
The selected op amp needs to have a very low-offset voltage (the
DAC LSB is 38 μV with a 2.5 V reference) to eliminate the need
for output offset trims. Input bias current should also be very
low because the bias current, multiplied by the DAC output
impedance (approximately 6 kΩ), adds to the zero code error.
Rail-to-rail input and output performance is required. For fast
settling, the slew rate of the op amp should not impede the
settling time of the DAC. Output impedance of the DAC is
constant and code-independent, but to minimize gain errors,
the input impedance of the output amplifier should be as high
as possible. The amplifier should also have a 3 dB bandwidth of
1 MHz or greater. The amplifier adds another time constant to
the system, thus increasing the settling time of the output. A
higher 3 dB amplifier bandwidth results in a shorter effective
settling time of the combined DAC and amplifier.
+5V +2.5V
10µF
0.1µF
0.1µF
+5V
RFB
SERIAL
INTERFACE
V
REFF REFS
DD
R
FB
CS
INV
DIN
R
INV
UNIPOLAR
OUTPUT
OUT
SCLK
LDAC
AD5541/AD5542
–5V
EXTERNAL
OP AMP
DGND AGNDF AGNDS
Figure 30. Bipolar Output (AD5542 Only)
Table 7. Bipolar Code Table
DAC Latch Contents
MSB
LSB
Analog Output
FORCE SENSE AMPLIFIER SELECTION
1111 1111 1111 1111
1000 0000 0000 0001
1000 0000 0000 0000
0111 1111 1111 1111
0000 0000 0000 0000
+VREF × (32,767/32,768)
+VREF × (1/32,768)
0 V
−VREF × (1/32,768)
−VREF × (32,768/32,768) = −VREF
Use single-supply, low-noise amplifiers. A low-output impedance
at high frequencies is preferred because the amplifiers need to
be able to handle dynamic currents of up to 20 mA.
REFERENCE AND GROUND
Because the input impedance is code-dependent, the reference
pin should be driven from a low impedance source. The
AD5541A/AD5542A/AD5512A operate with a voltage
reference ranging from 2 V to VDD. References below 2 V result
in reduced accuracy. The full-scale output voltage of the DAC is
determined by the reference. Table 6 and Table 7 outline the
analog output voltage or particular digital codes. For optimum
performance, Kelvin sense connections are provided on the
AD5542.
If the application doesn’t require separate force and sense lines,
tie the lines close to the package to minimize voltage drops
between the package leads and the internal die.
Rev. PrB | Page 14 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
POWER-ON RESET
POWER SUPPLY AND REFERENCE BYPASSING
The AD5541A/AD5542A/AD5512A have a power-on reset
function to ensure that the output is at a known state on power-
up. On power-up, the DAC register contains all 0s until the data
is loaded from the serial register. However, the serial register is
not cleared on power-up, so its contents are undefined. When
loading data initially to the DAC, 16 bits or more should be loaded
to prevent erroneous data appearing on the output. If more than
16 bits are loaded, the last 16 are kept, and if less than 16 bits are
loaded, bits remain from the previous word. If the AD5541/
AD5542 need to be interfaced with data shorter than 16 bits,
the data should be padded with 0s at the LSBs.
For accurate high-resolution performance, it is recommended
that the reference and supply pins be bypassed with a 10 μF
tantalum capacitor in parallel with a 0.1 μF ceramic capacitor.
Rev. PrB | Page 15 of 24
AD5541A/AD5542A/AD5512A
Preliminary Technical Data
MICROPROCESSOR INTERFACING
Microprocessor interfacing to the AD5541A/AD5542A is via a
serial bus that uses standard protocol that is compatible with
DSP processors and microcontrollers. The communications
channel requires a 3- or 4-wire interface consisting of a clock
signal, a data signal and a synchronization signal. The
AD5541/AD5542 require a 16-bit data-word with data valid on
the rising edge of SCLK. The DAC update can be done
automatically when all the data is clocked in or it can be done
AD5541/AD5542 TO MICROWIRE INTERFACE
Figure 33 shows an interface between the AD5541/AD5542
and any MICROWIRE-compatible device. Serial data is shifted
out on the falling edge of the serial clock and into the AD5541/
AD5542 on the rising edge of the serial clock. No glue logic is
required because the DAC clocks data into the input shift
register on the rising edge.
LDAC
under control of the
(AD5542 only).
CS
SO
CS
AD5541/
AD5542*
MICROWIRE*
DIN
AD5541/AD5542 TO ADSP-2101/ADSP-2103
INTERFACE
SCLK
SCLK
*ADDITIONAL PINS OMITTED FOR CLARITY.
Figure 31 shows a serial interface between the AD5541/AD5542
and the ADSP-2101/ADSP-2103. The ADSP-2101/ADSP-2103
should be set to operate in the SPORT transmit alternate framing
mode. The ADSP-2101/ADSP-2103 are programmed through
the SPORT control register and should be configured as follows:
internal clock operation, active low framing, 16-bit word length.
Transmission is initiated by writing a word to the Tx register
after the SPORT has been enabled. As the data is clocked out
on each rising edge of the serial clock, an inverter is required
between the DSP and the DAC, because the AD5541/AD5542
clock data in on the falling edge of the SCLK.
Figure 33. AD5541/AD5542 to MICROWIRE Interface
AD5541/AD5542 TO 80C51/80L51 INTERFACE
A serial interface between the AD5541/AD5542 and the 80C51/
80L51 microcontroller is shown in Figure 34. TxD of the micro-
controller drives the SCLK of the AD5541/AD5542, and RxD
drives the serial data line of the DAC. P3.3 is a bit programmable
CS
pin on the serial port that is used to drive
.
The 80C51/80L51 provide the LSB first, whereas the AD5541/
AD5542 expects the MSB of the 16-bit word first. Care should
be taken to ensure the transmit routine takes this into account.
FO
TFS
LDAC**
When data is to be transmitted to the DAC, P3.3 is taken low.
Data on RxD is valid on the falling edge of TxD, so the clock
must be inverted as the DAC clocks data into the input shift
register on the rising edge of the serial clock. The 80C51/80L51
transmit data in 8-bit bytes with only eight falling clock edges
occurring in the transmit cycle. As the DAC requires a 16-bit
word, P3.3 must be left low after the first eight bits are transferred,
CS
AD5541/
AD5542*
ADSP-2101/
ADSP-2103*
DT
DIN
SCLK
SCLK
*ADDITIONAL PINS OMITTED FOR CLARITY.
**AD5542 ONLY.
Figure 31. AD5541/AD5542 to ADSP-2101/ADSP-2103 Interface
LDAC
AD5541/AD5542 TO 68HC11/68L11 INTERFACE
and brought high after the second byte is transferred.
on
the AD5542 can also be controlled by the 80C51/ 80L51 serial
port output by using another bit programmable pin, P3.4.
Figure 32 shows a serial interface between the AD5541/AD5542
and the 68HC11/68L11 microcontroller. SCK of the 68HC11/
68L11 drives the SCLK of the DAC, and the MOSI output drives
P3.4
P3.3
RxD
TxD
LDAC**
CS
the serial data line serial DIN. The
signal is driven from one
80C51/
80L51*
CS
AD5541/
AD5542*
of the port lines. The 68HC11/68L11 is configured for master
mode: MSTR = 1, CPOL = 0, and CPHA = 0. Data appearing
on the MOSI output is valid on the rising edge of SCK.
DIN
SCLK
*ADDITIONAL PINS OMITTED FOR CLARITY.
**AD5542 ONLY.
PC6
PC7
LDAC**
Figure 34. AD5541/AD5542 to 80C51/80L51 Interface
68HC11/
68L11*
CS
AD5541/
AD5542*
MOSI
SCK
DIN
SCLK
*ADDITIONAL PINS OMITTED FOR CLARITY.
**AD5542 ONLY.
Figure 32. AD5541/AD5542 to 68HC11/68L11 Interface
Rev. PrB | Page 16 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
APPLICATIONS INFORMATION
OPTOCOUPLER INTERFACE
DECODING MULTIPLE AD5541/AD5542s
The digital inputs of the AD5541A/AD5542A/AD5512A are
Schmitt-triggered so that they can accept slow transitions on the
digital input lines. This makes these parts ideal for industrial
applications where it may be necessary to isolate the DAC from
the controller via optocouplers. Figure 35 illustrates such an
interface.
CS
pin of the AD5541/AD5542 can be used to select one of
The
a number of DACs. All devices receive the same serial clock and
CS
serial data, but only one device receives the
signal at any one
time. The DAC addressed is determined by the decoder. There is
some digital feedthrough from the digital input lines. Using a
burst clock minimizes the effects of digital feedthrough on the
analog signal channels. Figure 36 shows a typical circuit.
5V
REGULATOR
AD5541/AD5542
SCLK
0.1µF
POWER
10µF
CS
V
OUT
DIN
DIN
V
DD
DD
DD
V
DD
SCLK
10kΩ
V
DD
SCLK
SCLK
ENABLE
AD5541/AD5542
EN
CS
CODED
ADDRESS
V
DECODER
DGND
OUT
DIN
V
AD5541/AD5542
SCLK
10kΩ
CS
CS
V
AD5541/AD5542
OUT
CS
V
OUT
V
DIN
SCLK
10kΩ
DIN
DIN
GND
AD5541/AD5542
CS
V
OUT
DIN
Figure 35. AD5541/AD5542 in an Optocoupler Interface
SCLK
Figure 36. Addressing Multiple AD5541/AD5542s
Rev. PrB | Page 17 of 24
AD5541A/AD5542A/AD5512A
OUTLINE DIMENSIONS
Preliminary Technical Data
3.10
3.00
2.90
10
6
5.15
4.90
4.65
3.10
3.00
2.90
1
5
PIN 1
0.50 BSC
0.95
0.85
0.75
1.10 MAX
0.80
0.60
0.40
8°
0°
0.15
0.05
0.33
0.17
SEATING
PLANE
0.23
0.08
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-BA
Figure 37. 10-Lead Mini Small Outline Package [MSOP]
(RM-10)
Dimensions shown in millimeters.
0.30
0.23
0.18
3.00
BSC SQ
0.50 BSC
10
6
PIN 1 INDEX
AREA
1.74
1.64
1.49
EXPOSED
PAD
(BOTTOM VIEW)
0.50
0.40
0.30
5
1
PIN 1
INDICATOR
(R 0.19)
TOP VIEW
2.48
2.38
2.23
0.80 MAX
0.55 NOM
0.80
0.75
0.70
0.05 MAX
0.02 NOM
SEATING
PLANE
0.20 REF
Figure 38. 10-Lead Lead Frame Chip Scale Package [LFCSP]
(CP-10-9)
Dimensions shown in millimeters.
Rev. PrB | Page 18 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
0.35
0.30
0.25
3.00
BSC SQ
0.65 BSC
8
5
4
PIN 1 INDEX
AREA
1.74
1.64
1.49
EXPOSED
PAD
(BOTTOM VIEW)
0.50
0.40
0.30
1
PIN 1
INDICATOR
(R 0.2)
TOP VIEW
2.48
2.38
2.23
0.80 MAX
0.55 NOM
0.80
0.75
0.70
0.05 MAX
0.02 NOM
SEATING
PLANE
0.20 REF
Figure 39. 8-Lead Lead Frame Chip Scale Package [LFCSP]
(CP-8-3)
Dimensions shown in millimeters.
5.10
5.00
4.90
16
9
4.50
4.40
4.30
6.40
BSC
1
8
PIN 1
1.20
MAX
0.20
0.15
0.05
0.75
0.60
0.45
0.09
8°
0°
0.30
0.19
0.65
BSC
SEATING
PLANE
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-153-AB
Figure 40. 16-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-16)
Dimensions shown in millimeters.
Rev. PrB | Page 19 of 24
AD5541A/AD5542A/AD5512A
Preliminary Technical Data
3.10
3.00 SQ
2.90
0.30
0.23
0.18
PIN 1
INDICATOR
PIN 1
INDICATOR
13
16
0.50
BSC
1
4
12
EXPOSED
PAD
1.75
1.60 SQ
1.55
9
8
5
0.50
0.40
0.30
0.25 MIN
TOP VIEW
BOTTOM VIEW
0.80
0.75
0.70
0.05 MAX
0.02 NOM
COPLANARITY
0.08
0.20 REF
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MO-220-WEED.
Figure 41. 16-Lead Lead Frame Chip Scale Package [LFCSP]
(CP-16-22)
Dimensions shown in millimeters.
Rev. PrB | Page 20 of 24
Preliminary Technical Data
AD5541A/AD5542A/AD5512A
ORDERING GUIDE
Clear to Code
Package
Description
Package
Option
Model
INL
1 LSB
DNL
1 LSB
Temperature Range
AD5541ABRMZ
AD5541AARMZ
AD5541ABCPZ
AD5541AACPZ
AD5541ABCPZ-1
AD5542ABRUZ
AD5542AARUZ
AD5542ASRUZ
AD5542ABCPZ
AD5542AACPZ
AD5442ABCPZ-1
AD5512AACPZ
Midscale
Midscale
Midscale
Midscale
Zero-scale
Midscale
Midscale
Midscale
Midscale
Midscale
Midscale
Midscale
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−55°C to +125°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
10-Lead MSOP
10-Lead MSOP
10-Lead LFCSP
10-Lead LFCSP
8-Lead LFCSP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead LFCSP
16-Lead LFCSP
10-Lead LFCSP
16-Lead LFCSP
RM-10
RM-10
CP-10-9
CP-10-9
CP_8-3
RU-16
RU-16
RU-16
CP-16-22
CP-16-22
CP-10-9
CP-16-22
2 LSB
1 LSB
2 LSB
1 LSB
1 LSB
2 LSB
1 LSB
1 LSB
2 LSB
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
Rev. PrB | Page 21 of 24
AD5541A/AD5542A/AD5512A
NOTES
Preliminary Technical Data
Rev. PrB | Page 22 of 24
Preliminary Technical Data
NOTES
AD5541A/AD5542A/AD5512A
Rev. PrB | Page 23 of 24
AD5541A/AD5542A/AD5512A
NOTES
Preliminary Technical Data
©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
PR08516-0-3/10(PrB)
Rev. PrB | Page 24 of 24
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