32-Channel, 16-/14-Bit,
Serial Input, Voltage Output DAC
AD5372/AD5373
2.5 V to 5.5 V JEDEC-compliant digital levels
FEATURES
Digital reset (RESET)
Clear function to user-defined SIGGNDx
Simultaneous update of DAC outputs
32-channel DAC in a 64-lead LQFP and 64-lead LFCSP
AD5372/AD53731 guaranteed monotonic to 16/14 bits
Maximum output voltage span of 4 × VREF (20 V)
Nominal output voltage range of −4 V to +8 V
Multiple, independent output voltage spans available
System calibration function allowing user-programmable
offset and gain
Channel grouping and addressing features
Thermal shutdown function
DSP/microcontroller-compatible serial interface
SPI serial interface
APPLICATIONS
Level setting in automatic test equipment (ATE)
Variable optical attenuators (VOA)
Optical switches
Industrial control systems
Instrumentation
FUNCTIONAL BLOCK DIAGRAM
DV
V
V
SS
AGND DGND
LDAC
CC
DD
VREF0
n = 16 FOR AD5372
n = 14 FOR AD5373
n
CONTROL
REGISTER
GROUP 0
BUFFER
n
n
14
n
OFFSET
DAC 0
OFS0
REGISTER
8
n
8
A/B SELECT
REGISTER
TO
MUX 2s
BUFFER
OUTPUT BUFFER
AND POWER-
DOWN CONTROL
VOUT0
VOUT1
VOUT2
VOUT3
VOUT4
VOUT5
VOUT6
VOUT7
SIGGND0
n
n
X2A REGISTER
X2B REGISTER
DAC 0
REGISTER
DAC 0
X1 REGISTER
n
n
n
M REGISTER
n
C REGISTER
OUTPUT BUFFER
AND POWER-
DOWN CONTROL
n
n
n
n
n
X2A REGISTER
X2B REGISTER
DAC 7
REGISTER
SERIAL
INTERFACE
DAC 7
X1 REGISTER
SYNC
SDI
n
n
n
M REGISTER
n
SCLK
SDO
C REGISTER
VREF1
GROUP 1
BUFFER
n
n
14
n
BUSY
OFFSET
DAC 1
OFS1
REGISTER
8
n
8
A/B SELECT
TO
MUX 2s
BUFFER
RESET
CLR
REGISTER
OUTPUT BUFFER
AND POWER-
DOWN CONTROL
VOUT8
n
n
X2A REGISTER
X2B REGISTER
DAC 0
REGISTER
DAC 0
X1 REGISTER
VOUT9
n
n
n
M REGISTER
n
VOUT10
VOUT11
VOUT12
VOUT13
VOUT14
VOUT15
SIGGND1
STATE
MACHINE
C REGISTER
OUTPUT BUFFER
AND POWER-
DOWN CONTROL
n
n
n
n
n
X2A REGISTER
X2B REGISTER
DAC 7
REGISTER
DAC 7
X1 REGISTER
n
n
n
M REGISTER
n
C REGISTER
VREF1 SUPPLIES
GROUP 1 TO GROUP 3
VOUT16
TO
VOUT31
GROUP 2 TO GROUP 3
ARE IDENTICAL TO GROUP 1
AD5372/
AD5373
SIGGND2
SIGGND3
Figure 1.
1 Protected by U.S. Patent No. 5,969,657.
Rev. C
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