MAX5351BCUA+ [MAXIM]
D/A Converter, 1 Func, Serial Input Loading, 16us Settling Time, PDSO8, UMAX-8;
| 型号： | MAX5351BCUA+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | D/A Converter, 1 Func, Serial Input Loading, 16us Settling Time, PDSO8, UMAX-8 光电二极管 转换器 |
| 文件： | 总16页 (文件大小：149K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1124; Rev 1; 12/96
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
/MAX351
__________________Ge n e ra l De s c rip t io n
______________________________Fe a t u re s
The MAX535/MAX5351 combine a low-power, voltage-
output, 13-bit digital-to-analog converter (DAC) and a
precision output amplifier in an 8-pin µMAX or DIP pack-
age. The MAX535 operates from a single +5V supply
and the MAX5351 operates from a single +3.3V supply.
Both devices draw only 280µA of supply current.
♦ 13-Bit DAC with Configurable Output Amplifier
♦ +5V Single-Supply Operation (MAX535)
+3.3V Single-Supply Operation (MAX5351)
♦ Low Supply Current: 0.24mA Normal Operation
2µA Shutdown Mode
The output amplifier’s inverting input is available to the
us e r, a llowing s p e c ific g a in c onfig ura tions , re mote
sensing, and high output current capability. This makes
the MAX535/MAX5351 ideal for a wide range of appli-
cations, including industrial process control. Other fea-
tures include a software shutdown and power-on reset.
♦ Available in 8-Pin µMAX
♦ Power-On Reset Clears DAC Output to 0V
♦ SPI/QSPI and Microwire Compatible
♦ Schmitt-Trigger Digital Inputs for Direct
Optocoupler Interface
The serial interface is compatible with either SPI™/
QSPI™ or Microwire™. The DAC has a double-buffered
input, organized as an input register followed by a DAC
register. A 16-bit serial word loads data into the input
register. The DAC register can be updated indepen-
dently or simultaneously with the input register. All logic
inputs are TTL/CMOS-logic compatible and buffered
with Schmitt triggers to allow direct interfacing to opto-
couplers.
_________________Ord e rin g In fo rm a t io n
INL
(LSB)
PART
TEMP. RANGE PIN-PACKAGE
MAX535ACPA 0°C to +70°C
MAX535BCPA 0°C to +70°C
MAX535ACUA 0°C to +70°C
MAX535BCUA 0°C to +70°C
8 Plastic DIP
8 Plastic DIP
±1/2
±1
________________________Ap p lic a t io n s
Industrial Process Controls
†
8 µMAX
±1/2
±1
8 µMAX
Dice*
MAX535BC/D
0°C to +70°C
±1
Automatic Test Equipment
Ordering Information continued at end of data sheet.
Contact factory for availability.
Digital Offset and Gain Adjustment
Motion Control
†
*Dice are tested at T = +25°C, DC parameters only.
A
Remote Industrial Controls
Microprocessor-Controlled Systems
____________________Fu n c t io n a l Dia g ra m
_______________________P in Co n fig u ra t io n
V
DD
REF
GND
TOP VIEW
FB
OUT
DAC
REGISTER
DAC
1
2
3
4
8
7
6
5
V
OUT
CS
DD
CONTROL
GND
REF
FB
MAX535
INPUT
REGISTER
MAX5351
DIN
SCLK
CS
DIN
16-BIT
SHIFT
REGISTER
MAX535
MAX5351
DIP/µMAX
SCLK
SPI and QSPI are registered trademarks of Motorola, Inc. Microwire is a registered trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND.................................................................-0.3V, +6V
Operating Temperature Ranges
REF, OUT, FB to GND ................................-0.3V to (V + 0.3V)
Digital Inputs to GND ...............................................-0.3V to +6V
Continuous Current into Any Pin.......................................±20mA
MAX535_C_A/MAX5351_C_A...............................0°C to +70°C
MAX535_E_A/MAX5351_E_A ............................-40°C to +85°C
MAX535BMJA/MAX5351BMJA .......................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
DD
Continuous Power Dissipation (T = +70°C)
A
Plastic DIP (derate 6.90mW/°C above +70°C) .................552mW
µMAX (derate 4.00mW/°C above +70°C) ......................330mW
CERDIP (derate 8.00mW/°C above +70°C)...................640mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS: MAX535
(V = +5V ±10%, REF = 2.5V, GND = 0V, R = 5kΩ, C = 100pF, T = T
to T , unless otherwise noted. Typical values are at
MAX
DD
L
L
A
MIN
T
A
= +25°C. Output buffer connected in unity-gain configuration (Figure 8).)
/MAX351
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Bits
STATIC PERFORMANCE—ANALOG SECTION
Resolution
N
13
MAX535A
MAX535B
±0.5
±1.0
±2.0
±1.0
±8
Integral Nonlinearity
(Note 1)
INL
DNL
LSB
MAX535MJA
Differential Nonlinearity
Offset Error
Guaranteed monotonic
LSB
mV
V
OS
±0.3
6
Offset-Error Tempco
Gain Error (Note 1)
TCV
ppm/°C
LSB
OS
GE
-0.5
1
±6
Gain-Error Tempco
ppm/°C
µV/V
Power-Supply Rejection Ratio
REFERENCE INPUT
Reference Input Range
Reference Input Resistance
PSRR
4.5V ≤ V ≤ 5.5V
600
DD
V
REF
0
V
- 1.4
V
DD
R
Code dependent, minimum at code 1555 hex
14
20
kΩ
REF
MULTIPLYING-MODE PERFORMANCE
Reference -3dB Bandwidth
V
= 0.67Vp-p
650
-84
kHz
dB
REF
Reference Feedthrough
Input code = all 0s, V
= 3.6Vp-p at 1kHz
REF
Signal-to-Noise Plus
SINAD
V
REF
= 1Vp-p at 25kHz, code = full scale
77
dB
Distortion Ratio
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
V
2.4
V
V
IH
V
IL
0.8
±0.5
I
IN
V
IN
= 0V or V
0.001
8
µA
pF
DD
C
IN
2
_______________________________________________________________________________________
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
/MAX351
ELECTRICAL CHARACTERISTICS: MAX535 (continued)
(V = +5V ±10%, REF = 2.5V, GND = 0V, R = 5kΩ, C = 100pF, T = T
to T
, unless otherwise noted. Typical values are at
DD
L
L
A
MIN
MAX
T
A
= +25°C. Output buffer connected in unity-gain configuration (Figure 8).)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMICPERFORMANCE
Voltage Output Slew Rate
Output Settling Time
Output Voltage Swing
Current into FB
SR
0.6
16
V/µs
µs
To ±1/2LSB, V
= 2.5V
STEP
Rail-to-rail (Note 2)
0 to V
V
DD
0.001
±0.1
µA
Time to Valid Operation
on Start-Up
20
µs
Digital Feedthrough
5
nV-s
CS = V , DIN = 100kHz
DD
POWER SUPPLIES
Supply Voltage
V
4.5
5.5
0.4
V
DD
Supply Current
I
DD
(Note 3)
(Note 3)
0.28
4
mA
µA
µA
Supply Current in Shutdown
Reference Current in Shutdown
TIMING CHARACTERISTICS
SCLK Clock Period
20
0.001
±0.5
t
100
40
ns
ns
ns
ns
CP
SCLK Pulse Width High
SCLK Pulse Width Low
CS Fall to SCLK Rise Setup Time
t
CH
t
40
CL
t
40
CSS
CSH
t
0
40
0
ns
ns
ns
ns
SCLK Rise to CS Rise Hold Time
DIN Setup Time
t
DS
DIN Hold Time
t
DH
t
t
40
SCLK Rise to CS Fall Delay
CS0
40
ns
ns
CS Rise to SCLK Rise Hold Time
CS Pulse Width High
CS1
t
100
CSW
Note 1: Guaranteed from code 22 to code 8191 in unity-gain configuration.
Note 2: Accuracy is better than 1LSB for V = 8mV to V - 100mV, guaranteed by a power-supply rejection test at the
OUT
DD
end points.
Note 3: R = ∞, digital inputs at GND or V
.
DD
L
_______________________________________________________________________________________
3
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
ELECTRICAL CHARACTERISTICS: MAX5351
(V = +3.15V to +3.6V, REF = 1.25V, GND = 0V, R = 5kΩ, C = 100pF, T = T
to T , unless otherwise noted. Typical values
MAX
DD
L
L
A
MIN
are at T = +25°C. Output buffer connected in unity-gain configuration (Figure 8).)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Bits
STATIC PERFORMANCE—ANALOG SECTION
Resolution
N
13
MAX5351A
MAX5351B
MAX5351MJA
±1
±2
Integral Nonlinearity
(Note 4)
INL
LSB
±4
Differential Nonlinearity
Offset Error
DNL
Guaranteed monotonic
±1.0
±8
LSB
mV
V
OS
±0.3
6
Offset-Error Tempco
Gain Error (Note 4)
TCV
ppm/°C
LSB
OS
GE
-0.5
1
±6
Gain-Error Tempco
ppm/°C
µV/V
/MAX351
Power-Supply Rejection Ratio
REFERENCE INPUT
Reference Input Range
Reference Input Resistance
PSRR
600
V
REF
0
V
- 1.4
V
DD
R
Code dependent, minimum at code 1555 hex
14
20
kΩ
REF
MULTIPLYING-MODE PERFORMANCE (V = +3.3V)
DD
Reference -3dB Bandwidth
Reference Feedthrough
V
= 0.67Vp-p
650
-84
kHz
dB
REF
Input code = all 0s, V
= 1.9Vp-p at 1kHz
REF
Signal-to-Noise Plus
Distortion Ratio
SINAD
V
REF
= 1Vp-p at 25kHz, code = full scale
72
dB
DIGITAL INPUTS
Input High Voltage
V
2.4
V
V
IH
Input Low Voltage
V
IL
0.6
±0.5
Input Leakage Current
Input Capacitance
I
IN
V
IN
= 0V or V
0.001
8
µA
pF
DD
C
IN
DYNAMIC PERFORMANCE
Voltage Output Slew Rate
Output Settling Time
Output Voltage Swing
Current into FB
SR
0.6
16
V/µs
µs
To ±1/2LSB, V
= 1.25V
STEP
Rail-to-rail (Note 5)
0 to V
V
DD
0.001
±0.1
µA
Time to Valid Operation
on Start-Up
20
µs
Digital Feedthrough
POWER SUPPLIES
Supply Voltage
5
nV-s
CS = V , DIN = 100kHz
DD
V
3.15
3.6
0.4
V
DD
Supply Current
I
DD
(Note 6)
(Note 6)
0.24
1.6
mA
µA
µA
Supply Current in Shutdown
Reference Current in Shutdown
10
0.001
±0.5
4
_______________________________________________________________________________________
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
/MAX351
ELECTRICAL CHARACTERISTICS: MAX5351 (continued)
(V = +3.15V to +3.6V, REF = 1.25V, GND = 0V, R = 5kΩ, C = 100pF, T = T
to T
, unless otherwise noted. Typical values
MAX
DD
L
L
A
MIN
are at T = +25°C. Output buffer connected in unity-gain configuration (Figure 8).)
A
PARAMETER
TIMING CHARACTERISTICS
SCLK Clock Period
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
t
100
40
ns
ns
ns
ns
CP
SCLK Pulse Width High
SCLK Pulse Width Low
CS Fall to SCLK Rise Setup Time
t
CH
t
40
CL
t
40
CSS
CSH
t
0
40
0
ns
ns
ns
ns
SCLK Rise to CS Rise Hold Time
DIN Setup Time
t
DS
DIN Hold Time
t
DH
t
t
40
SCLK Rise to CS Fall Delay
CS0
CS1
40
ns
ns
CS Rise to SCLK Rise Hold Time
CS Pulse Width High
t
100
CSW
Note 4: Guaranteed from code 44 to code 8191 in unity-gain configuration.
Note 5: Accuracy is better than 1LSB for V = 8mV to V - 150mV, guaranteed by a power-supply rejection test at the
OUT
DD
end points.
= ∞, digital inputs at GND or V
Note 6:
R
.
DD
L
_______________________________________________________________________________________
5
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(MAX535 only, V = +5V, R = 5kΩ, C = 100pF, T = +25°C, unless otherwise noted.)
L
L
DD
A
MAX535
SUPPLY CURRENT
vs. TEMPERATURE
REFERENCE VOLTAGE INPUT
FREQUENCY RESPONSE
INTEGRAL NONLINEARITY
vs. REFERENCE VOLTAGE
0.3
0.2
400
380
360
340
320
300
280
260
240
220
200
0
-4
R = ∞
L
0.1
0
-8
-0.1
-0.2
-0.3
-0.4
-0.5
-12
-16
-20
/MAX351
-60
-20
20
60
100
140
100
6.0
0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4
REFERENCE VOLTAGE (V)
0
500k 1M 1.5M 2M 2.5M 3M
FREQUENCY (Hz)
TEMPERATURE (°C)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
POWER-DOWN SUPPLY CURRENT
vs. TEMPERATURE
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
500
450
400
350
300
250
200
150
100
50
-50
-55
10
9
8
7
6
5
4
3
2
1
0
V
= 2.5V + 1Vp-p SINE
DC
REF
CODE = FULL SCALE
-60
-65
-70
-75
-80
-85
-90
0
1
10
4.0
4.4
4.8
5.2
5.6
6.0
-60
-20
20
60
100
140
FREQUENCY (kHz)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
REFERENCE FEEDTHROUGH
AT 1kHz
FULL-SCALE OUTPUT
vs. LOAD
OUTPUT FFT PLOT
0
-20
2.500
0
-20
V
REF
= 3.6Vp-p
REFERENCE INPUT SIGNAL
2.499
2.498
2.497
2.496
2.495
2.494
2.493
2.492
2.491
CODE = FULL SCALE
= 1kHz
f
IN
-40
-40
-60
-60
OUTPUT FEEDTHROUGH
-80
-80
-100
-100
2.490
0.5
1.6
2.7
3.8
4.9
6.0
0.5
1.6
2.7
3.8
4.9
0.01k 0.1k
1k
10k 100k 1M 10M
LOAD (Ω)
FREQUENCY (kHz)
FREQUENCY (kHz)
6
_______________________________________________________________________________________
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
/MAX351
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(MAX535 only, V = +5V, R = 5kΩ, C = 100pF, T = +25°C, unless otherwise noted.)
L
L
DD
A
MAX535 (continued)
MAJOR-CARRY TRANSITION
DIGITAL FEEDTHROUGH (f
= 100kHz)
SCLK
SCLK,
2V/div
CS
5V/div
OUT,
AC COUPLED
100mV/div
OUT,
AC COUPLED
10mV/div
CODE = 4096
10µs/div
2µs/div
CS = 5V
DYNAMIC RESPONSE
OUT
1V/div
GND
10µs/div
GAIN = 2, SWITCHING FROM CODE 0 TO 8040
_______________________________________________________________________________________
7
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(MAX5351 only, V = +3.3V, R = 5kΩ, C = 100pF, T = +25°C, unless otherwise noted.)
L
L
DD
A
MAX5351
SUPPLY CURRENT
vs. TEMPERATURE
REFERENCE VOLTAGE INPUT
FREQUENCY RESPONSE
INTEGRAL NONLINEARITY
vs. REFERENCE VOLTAGE
360
340
320
0.6
0.4
0
-4
R = ∞
L
0.2
300
280
260
240
0
-8
-0.2
-0.4
-0.6
-0.8
-1.0
-12
-16
-20
220
200
/MAX351
-60
-20
20
60
100
140
100k
500k
1M
1.5M
2M
2.5M
0.4
0.8
1.2
1.6
2.0
2.4
REFERENCE VOLTAGE (V)
TEMPERATURE (°C)
FREQUENCY (Hz)
POWER-DOWN SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
450
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-50
-55
V
= 1V + 0.5Vp-p SINE
DC
REF
CODE = FULL SCALE
400
350
300
250
200
-60
-65
-70
-75
-80
150
100
-60
-20
20
60
100
140
100
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8
SUPPLY VOLTAGE (V)
1
10
FREQUENCY (kHz)
TEMPERATURE (°C)
FULL-SCALE OUTPUT
vs. LOAD
REFERENCE FEEDTHROUGH
AT 1kHz
OUTPUT FFT PLOT
1.24932
1.24930
1.24928
1.24926
0
-20
-40
0
-20
V
= 1.9Vp-p
REF
REFERENCE INPUT SIGNAL
CODE = FULL SCALE
= 1kHz
f
IN
-40
1.24924
1.24922
1.24920
1.24918
1.24916
1.24914
-60
-80
-60
OUTPUT FEEDTHROUGH
-80
-100
-100
1k
10k
100k
1M
100
10M
0.5
1.6
2.7
3.8
4.9
6.0
0.5
1.2
1.9
2.6
3.3
4.0
LOAD (Ω)
FREQUENCY (kHz)
FREQUENCY (kHz)
8
_______________________________________________________________________________________
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
/MAX351
_____________________P in De s c rip t io n
FB
PIN
1
NAME
OUT
CS
FUNCTION
DAC Output Voltage
Chip-Select Input. Active low.
Serial-Data Input
OUT
R
R
R
2
2R
D0
2R
D10
2R
D11
2R
D12
2R
3
DIN
4
SCLK
Serial-Clock Input
5
6
7
8
FB
DAC Output Amplifier Feedback
Reference Voltage Input
Ground
REF
REF
GND
AGND
SHOWN FOR ALL 1s ON DAC
V
DD
Positive Power Supply
Figure 1. Simplified DAC Circuit Diagram
code of 0000 hex. Because the input impedance at the
reference pin is code dependent, load regulation of the
reference source is important.
_______________De t a ile d De s c rip t io n
The MAX535/MAX5351 contain a 13-bit, voltage-output
d ig ita l-to-a na log c onve rte r (DAC) tha t is e a s ily
addressed using a simple 3-wire serial interface. It
includes a 16-bit shift register, and has a doubled-
buffered input composed of an input register and a
DAC register (see Functional Diagram). In addition to
the voltage output, the amplifier’s negative input is
available to the user.
The REF reference input has a 14kΩ guaranteed mini-
mum input impedance. A voltage reference with a load
regulation of 6ppm/mA, such as the MAX873, would
typically deviate by 0.0062LSB (0.009LSB worst case)
when driving the MAX535 reference input at 2.5V.
In shutdown mode, the MAX535/MAX5351’s REF input
enters a high-impedance state with a typical input leak-
age current of 0.001µA.
The DAC is an inverted R-2R ladder network that con-
verts a 13-bit digital input into an equivalent analog out-
p ut volta g e in p rop ortion to the a p p lie d re fe re nc e
voltage input. Figure 1 shows a simplified circuit dia -
gram of the DAC.
The reference input capacitance is also code depen-
dent and typically ranges from 15pF (with an input
code of all 0s) to 50pF (with an input code of all 1s).
Re fe re n c e In p u t s
The reference input accepts positive DC and AC sig-
nals. The voltage at the reference input sets the full-
scale output voltage for the DAC. The reference input
Ou t p u t Am p lifie r
The MAX535/MAX5351’s DAC outp ut is inte rna lly
buffered by a precision amplifier with a typical slew rate
of 0.6V/µs. Access to the output amplifier’s inverting
input provides the user greater flexibility in output gain
s e tting /s ig na l c ond itioning (s e e the Ap p lic a tions
Information section).
voltage range is 0V to (V - 1.4V). The output voltage
DD
(V
OUT)
is represented by a digitally programmable volt-
age source as:
V
= (V
x NB / 8192 ) x Gain
OUT
REF
With a full-scale transition at the MAX535/MAX5351 out-
put, the typical settling time to ±1/2LSB is 16µs when
loaded with 5kΩ in parallel with 100pF (loads less than
2kΩ degrade performance).
where NB is the numeric value of the DAC’s binary
input code (0 to 8191), V is the reference voltage,
and Gain is the externally set voltage gain.
REF
The MAX535 outp ut a mp lifie r’s outp ut d yna mic re -
sponses and settling performances are shown in the
Typical Operating Characteristics.
The impedance at the reference input is code depen-
dent, ranging from a low value of 14kΩ when the DAC
has an input code of 1555 hex, to a high value exceed-
ing several giga ohms (leakage currents) with an input
_______________________________________________________________________________________
9
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
S h u t d o w n Mo d e
The MAX535/MAX5351 feature a software-programmable
shutdown that reduces supply current to a typical value
of 4µA. Writing 111XXXXXXXXXXXXX as the input-control
word puts the MAX535/MAX5351 in shutdown mode
SCLK
SK
(Table 1).
In shutdown mode, the MAX535/MAX5351 output ampli-
fier and the reference input enter a high-impedance
state. The serial interface remains active. Data in the
input registers is retained in shutdown, allowing the
MAX535/MAX5351 to recall the output state prior to
entering shutdown. Exit shutdown mode by either recall-
ing the previous configuration or by updating the DAC
with new data. When powering up the device or bringing
it out of shutdown, allow 20µs for the output to stabilize.
MICROWIRE
PORT
MAX535
MAX5351
DIN
CS
SO
I/O
S e ria l-In t e rfa c e Co n fig u ra t io n s
The MAX535/MAX5351’s 3-wire serial interface is com-
p a tib le with b oth Mic rowire ™ (Fig ure 2) a nd
SPI™/QSPI™ (Figure 3). The serial input word consists
of three control bits followed by 13 data bits (MSB first),
as shown in Figure 4. The 3-bit control code determines
the MAX535/MAX5351’s response outlined in Table 1.
Figure 2. Connections for Microwire
/MAX351
+5V
SS
The MAX535/MAX5351’s d ig ita l inp uts a re d oub le
buffered. Depending on the command issued through
the serial interface, the input register can be loaded
without affecting the DAC register, the DAC register
can be loaded directly, or the DAC register can be
updated from the input register (Table 1).
DIN
MOSI
SCK
SPI/QSPI
PORT
MAX535
SCLK
MAX5351
S e ria l-In t e rfa c e De s c rip t io n
The MAX535/MAX5351 require 16 bits of serial data.
Table 1 lists the serial-interface programming com-
mands. For certain commands, the 13 data bits are
“don’t cares.” Data is sent MSB first and can be sent in
two 8-bit packets or one 16-bit word (CS must remain
low until 16 bits are transferred). The serial data is com-
posed of three control bits (C2, C1, C0), followed by the
13 data bits D12...D0 (Figure 4). The 3-bit control code
determines:
CS
I/O
CPOL = 0, CPHA = 0
Figure 3. Connections for SPI/QSPI
• The register to be updated
MSB ..................................................................................LSB
16 Bits of Serial Data
• The configuration when exiting shutdown
Figure 5 shows the serial-interface timing requirements.
The chip-select pin (CS) must be low to enable the DAC’s
serial interface. When CS is high, the interface control cir-
Control
Bits
Data Bits
MSB.............................................LSB
cuitry is disabled. CS must go low at least t
before the
CSS
C2
C1
C0
D12................................................D0
13 Data Bits
rising serial clock (SCLK) edge to properly clock in the
first bit. When CS is low, data is clocked into the internal
shift register via the serial-data input pin (DIN) on SCLK’s
rising edge. The maximum guaranteed clock frequency is
10MHz. Da ta is la tc he d into the MAX535/MAX5351
input/DAC register on CS’s rising edge.
3 Control
Bits
Figure 4. Serial-Data Format
10 ______________________________________________________________________________________
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
/MAX351
Table 1. Serial-Interface Programming Commands
16-BIT SERIAL WORD
FUNCTION
D12............................D0
MSB LSB
C2
C1
C0
X
X
0
0
0
1
13 bits of data
13 bits of data
Load input register; DAC register immediately updated (also exit shutdown).
Load input register; DAC register unchanged.
Update DAC register from input register (also exit shutdown; recall previ-
ous state).
X
1
0
XXXXXXXXXXXXX
1
0
1
1
1
1
XXXXXXXXXXXXX
XXXXXXXXXXXXX
Shutdown
No operation (NOP)
“X” = Don’t care
CS
COMMAND
EXECUTED
SCLK
DIN
1
8
9
16
D6 D5 D4 D3 D2 D1 D0
C1
C0 D12 D11 D10 D9 D8
C2
D7
Figure 5. Serial-Interface Timing Diagram
t
CSW
CS
t
CP
t
CSH
t
t
CH
CSS
t
t
CL
CSO
t
CS1
SCLK
t
DS
t
DH
DIN
Figure 6. Detailed Serial-Interface Timing Diagram
______________________________________________________________________________________ 11
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
DIN
SCLK
CS1
CS2
TO OTHER
SERIAL DEVICES
CS3
CS
CS
CS
MAX535
MAX535
MAX535
MAX5351
SCLK
MAX5351
SCLK
MAX5351
SCLK
/MAX351
DIN
DIN
DIN
Figure 7. Multiple MAX535/MAX5351s Sharing Common DIN and SCLK Lines
Fig ure 7 s hows a me thod of c onne c ting s e ve ra l
Table 2. Unipolar Code Table
MAX535/MAX5351s. In this configuration, the clock and
the data bus are common to all devices and separate
chip-select lines are used for each IC.
DAC CONTENTS
ANALOG OUTPUT
MSB
LSB
8191
__________Ap p lic a t io n s In fo rm a t io n
1 1 1 1 1
1 1 1 1
0 0 0 0
0 0 0 0
1 1 1 1
1 1 1 1
+V
REF
8192
Un ip o la r Ou t p u t
For a unipolar output, the output voltage and the refer-
ence input have the same polarity. Figure 8 shows the
MAX535/MAX5351 unipolar output circuit, which is also
the typical operating circuit. Table 2 lists the unipolar
output codes.
4097
8192
1 0 0 0 0
1 0 0 0 0
0 1 1 1 1
0 0 0 1
0 0 0 0
1 1 1 1
+V
REF
+V
REF
2
4096
8192
+V
REF
=
For rail-to-rail output, see Figure 9. This circuit shows
the MAX535/MAX5351 with the output amplifier config-
ured with a closed-loop gain of +2 to provide 0V to 5V
full-scale range when a 2.5V reference is used. When
using the MAX5351 with a 1.25V reference, this circuit
provides a 0V to 2.5V full-scale range.
4095
8192
+V
REF
1
0 0 0 0 0
0 0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 0
+V
REF
8192
0V
Bip o la r Ou t p u t
The MAX535/MAX5351 output can be configured for
bipolar operation using Figure 10’s circuit.
Us in g a n AC Re fe re n c e
In applications where the reference has AC-signal com-
ponents, the MAX535/MAX5351 have multiplying capa-
bility within the reference input range specifications.
Figure 11 shows a technique for applying a sine-wave
signal to the reference input where the AC signal is off-
set before being applied to REF. The reference voltage
must never be more negative than GND.
V
OUT
= V
[(2NB / 8192) - 1]
REF
where NB is the numeric value of the DAC’s binary input
code. Table 3 shows digital codes (offset binary) and
the corresponding output voltage for Figure 10’s circuit.
12 ______________________________________________________________________________________
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
/MAX351
The MAX535’s total harmonic distortion plus noise (THD
Table 3. Bipolar Code Table
+ N) is typically less than -77dB (full-scale code), and
the MAX5351’s THD + N is typically less than -72dB
(full-scale code), given a 1Vp-p signal swing and input
frequencies up to 25kHz. The typical -3dB frequency is
650kHz for b oth d e vic e s , a s s hown in the Typ ic a l
Operating Characteristics graphs.
DAC CONTENTS
MSB LSB
ANALOG OUTPUT
4095
1 1 1 1 1
1 1 1 1
1 1 1 1
+V
REF
4096
1
Dig it a lly P ro g ra m m a b le Cu rre n t S o u rc e
The c irc uit of Fig ure 12 p la c e s a n NPN tra ns is tor
(2N3904 or similar) within the op-amp feedback loop to
implement a digitally programmable, unidirectional cur-
rent source. This circuit can be used to drive 4–20mA
current loops, which are commonly used in industrial-
control applications. The output current is calculated
with the following equation:
1 0 0 0 0
1 0 0 0 0
0 1 1 1 1
0 0 0 0
0 0 0 0
1 1 1 1
0 0 0 1
0 0 0 0
1 1 1 1
+V
REF
4096
0V
1
-V
REF
4096
4095
4096
0 0 0 0 0
0 0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 0
-V
REF
I
= (V
/ R) x (NB / 8192)
OUT
REF
where NB is the numeric value of the DAC’s binary
inp ut c od e a nd R is the s e ns e re s is tor s hown in
Figure 12.
4096
4096
-V
REF
= - V
REF
MAX535
MAX5351
MAX535
MAX5351
+5V/+3.3V
+5V/+3.3V
REF
REF
V
V
DD
DD
10k
FB
FB
10k
DAC
DAC
OUT
OUT
GND
GND
Figure 8. Unipolar Output Circuit
Figure 9. Unipolar Rail-to-Rail Output Circuit
______________________________________________________________________________________ 13
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
+5V/
+3.3V
R1
R2
+5V/+3.3V
REF
26k
AC
REFERENCE
INPUT
MAX495
+5V/+3.3V
V
DD
+V
FB
10k
500mVp-p
V
DD
REF
V
OUT
DAC
OUT
DAC
V-
OUT
MAX535
MAX5351
R1 = R2 = 10kΩ ±0.1%
GND
MAX535
MAX5351
GND
/MAX351
Figure 10. Bipolar Output Circuit
Figure 11. AC Reference Input Circuit
Gro u n d in g a n d La yo u t Co n s id e ra t io n s
Digital or AC transient signals on GND can create noise
at the analog output. Tie GND to the highest-quality
ground available.
+5V/
+3.3V
REF
V
DD
V
L
Good printed circuit board ground layout minimizes
crosstalk between the DAC output, reference input, and
digital input. Reduce crosstalk by keeping analog lines
away from digital lines. Wire-wrapped boards are not
recommended.
MAX535
MAX5351
I
OUT
DAC
OUT
FB
2N3904
GND
R
Figure 12. Digitally Programmable Current Source
P o w e r-S u p p ly Co n s id e ra t io n s
On power-up, the input and DAC registers are cleared
(set to zero code).
For rated MAX535/MAX5351 performance, REF should
be at least 1.4V below V . Bypass V
with a 4.7µF
DD
DD
capacitor in parallel with a 0.1µF capacitor to GND.
Use short lead lengths and place the bypass capaci-
tors as close to the supply pins as possible.
14 ______________________________________________________________________________________
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
/MAX351
_Ord e rin g In fo rm a t io n (c o n t in u e d )
___________________Ch ip In fo rm a t io n
INL
(LSB)
TRANSISTOR COUNT: 1677
PART
TEMP. RANGE PIN-PACKAGE
MAX535AEPA
MAX535BEPA
MAX535AEUA
MAX535BEUA
MAX535BMJA
MAX5351ACPA
MAX5351BCPA
MAX5351ACUA
MAX5351BCUA
MAX5351BC/D
-40°C to +85°C 8 Plastic DIP
-40°C to +85°C 8 Plastic DIP
±1/2
±1
±1/2
±1
±2
±1
±2
±1
±2
±2
±1
±2
±1
±2
±4
†
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 µMAX
-55°C to +125°C 8 CERDIP**
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
8 Plastic DIP
8 Plastic DIP
†
8 µMAX
8 µMAX
Dice*
MAX5351AEPA -40°C to +85°C 8 Plastic DIP
MAX5351BEPA -40°C to +85°C 8 Plastic DIP
†
MAX5351AEUA -40°C to +85°C 8 µMAX
MAX5351BEUA -40°C to +85°C 8 µMAX
MAX5351BMJA -55°C to +125°C 8 CERDIP**
†
Contact factory for availability.
* Dice are tested at +25°C, DC parameters only.
**Contact factory for availability and processing to MIL-STD-883.
________________________________________________________P a c k a g e In fo rm a t io n
INCHES
MILLIMETERS
DIM
E
MIN
MAX
0.200
–
MIN
–
MAX
5.08
–
A
–
E1
D
A1 0.015
A2 0.125
A3 0.055
0.38
3.18
1.40
0.41
1.14
0.20
0.13
7.62
6.10
2.54
7.62
–
0.175
0.080
0.022
0.065
0.012
0.080
0.325
0.310
–
4.45
2.03
0.56
1.65
0.30
2.03
8.26
7.87
–
A3
A2
A1
A
L
B
0.016
B1 0.045
0.008
D1 0.005
0.300
E1 0.240
0.100
eA 0.300
C
0° - 15°
E
C
e
e
B1
eA
eB
–
–
B
eB
L
–
0.400
0.150
10.16
3.81
0.115
2.92
D1
INCHES
MILLIMETERS
PKG. DIM
PINS
Plastic DIP
PLASTIC
DUAL-IN-LINE
PACKAGE
(0.300 in.)
MIN
MAX MIN
MAX
8
P
P
P
P
P
N
D
D
D
D
D
D
0.348 0.390 8.84
9.91
14
16
18
20
24
0.735 0.765 18.67 19.43
0.745 0.765 18.92 19.43
0.885 0.915 22.48 23.24
1.015 1.045 25.78 26.54
1.14 1.265 28.96 32.13
21-0043A
______________________________________________________________________________________ 15
Lo w -P o w e r, 1 3 -Bit Vo lt a g e -Ou t p u t DACs
w it h S e ria l In t e rfa c e
___________________________________________P a c k a g e In fo rm a t io n (c o n t in u e d )
INCHES
MILLIMETERS
DIM
MIN
0.036
MAX
0.044
0.008
0.014
0.007
0.120
0.120
MIN
0.91
0.10
0.25
0.13
2.95
2.95
MAX
1.11
0.20
0.36
0.18
3.05
3.05
A
C
A1 0.004
α
A
B
C
D
E
e
0.010
0.005
0.116
0.116
0.101mm
0.004 in
e
B
A1
L
0.0256
0.65
H
L
0.188
0.016
0°
0.198
0.026
6°
4.78
0.41
0°
5.03
0.66
6°
α
21-0036D
/MAX351
E
H
8-PIN µMAX
MICROMAX SMALL-OUTLINE
PACKAGE
D
INCHES
MILLIMETERS
DIM
MIN
–
MAX
0.200
0.023
0.065
0.015
0.310
0.320
MIN
–
MAX
5.08
0.58
1.65
0.38
7.87
8.13
E1
E
A
B
0.014
0.36
0.97
0.20
5.59
7.37
D
B1 0.038
A
C
E
0.008
0.220
E1 0.290
e
L
0.100
2.54
0.125
0.150
0.015
–
0.200
–
3.18
3.81
0.38
–
5.08
–
0°-15°
C
Q
L1
Q
S
L
L1
0.070
0.098
–
1.78
2.49
–
e
B1
S1 0.005
0.13
B
S1
S
INCHES
MILLIMETERS
DIM PINS
MIN
–
MAX MIN MAX
CERDIP
D
D
D
D
D
D
8
0.405
0.785
0.840
0.960
1.060
1.280
–
–
–
–
–
–
10.29
19.94
21.34
24.38
26.92
CERAMIC DUAL-IN-LINE
PACKAGE
14
16
18
20
24
–
–
–
(0.300 in.)
–
–
32.51
21-0045A
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
16 __________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 (4 0 8 ) 7 3 7 -7 6 0 0
© 1996 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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