40-Channel, 14-Bit
Serial Input, Voltage-Output DAC
Preliminary Technical Data
AD5371
Power-on reset
Digital reset (RESET)
FEATURES
40-channel DAC in 80 Lead LQFP and 100 Ball CSPBGA
Clear function to user-defined SIGGND (CLR pin)
Simultaneous update of DAC outputs (LDAC pin)
Guaranteed monotonic to 14 bits
Maximum output voltage span of 4 × VREF (20 V)
Nominal output voltage range of -4 V to +8 V
Multiple, Independent output spans available
System calibration function allowing user-programmable
offset and gain
Channel grouping and addressing features
Thermal Monitor Function
DSP/microcontroller-compatible serial interface
LVDS serial interface
APPLICATIONS
Level setting in automatic test equipment (ATE)
Variable optical attenuators (VOA)
Optical switches
Industrial control systems
Instrumentation
2.5 V to 5.5 V JEDEC-compliant digital levels
FUNCTIONAL BLOCK DIAGRAM
DV
V
V
SS
AGND DNGD
CC
DD
LDAC
VREF0
GROUP 0
BUFFER
14
CONTROL
REGISTER
14
14
14
14
OFFSET
DAC 0
OFS0
REGISTER
8
8
A/B SELECT
REGISTER
TO
MUX 2's
BUFFER
OUTPUT BUFFER
AND POWER
DOWN CONTROL
14
VOUT0
VOUT1
VOUT2
VOUT3
VOUT4
VOUT5
VOUT6
VOUT7
14
14
14
X1A REGISTER
X2A REGISTER
DAC 0
REGISTER
MUX
2
MUX
1
DAC 0
14
14
X2B REGISTER
X1B REGISTER
M REGISTER
C REGISTER
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
14
14
SPI/LVDS
SYNC
SDI
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
OUTPUT BUFFER
AND POWER
·
SCLK
SYNC
SDI
14
14
14
14
14
14
X1A REGISTER
X2A REGISTER
SERIAL
INTERFACE
DAC 7
MUX
2
MUX
1
DAC 7
DOWN CONTROL
14
14
SIGGND0
REGISTER
X2B REGISTER
X1B REGISTER
M REGISTER
C REGISTER
14
SCLK
SDO
14
VREF1
GROUP 1
14
14
14
14
OFFSET
DAC 1
OFS1
REGISTER
BUSY
8
8
TO
MUX 2's
A/B SELECT
REGISTER
BUFFER
RESET
CLR
OUTPUT BUFFER
AND POWER
DOWN CONTROL
14
VOUT8
14
14
14
X1A REGISTER
X2A REGISTER
DAC 0
REGISTER
MUX
2
MUX
1
DAC 0
VOUT9
14
14
X2B REGISTER
X1B REGISTER
M REGISTER
C REGISTER
VOUT10
VOUT11
VOUT12
VOUT13
VOUT14
VOUT15
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
STATE
MACHINE
14
14
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
14
OUTPUT BUFFER
AND POWER
·
14
14
14
14
POWER-ON
RESET
14
14
X1A REGISTER
X2A REGISTER
DAC 7
MUX
2
MUX
1
DAC 7
DOWN CONTROL
14
14
SIGGND1
REGISTER
X2B REGISTER
X1B REGISTER
M REGISTER
C REGISTER
14
14
AD5371
VREF2 SUPPLIES
GROUPS 2 TO 4
VREF2
GROUPS 2 TO 4
SAME AS GROUP 1
VOUT16
TO
VOUT39
5371-0001
SIGGND3
SIGGND4
SIGGND2
Figure 1.
AD5371—Protected by U.S. Patent No. 5,969,657; other patents pending
Rev. PrF
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