40-Channel, 16-Bit, Serial Input,
Voltage-Output DACs
Preliminary Technical Data
AD5370
DSP/microcontroller-compatible serial interface
2.5 V to 5.5 V JEDEC-compliant digital levels
Power-on reset
FEATURES
40-channel DAC in 64 Lead LFCSP and LQFP
Guaranteed monotonic to 16 bits
Digital reset (RESET)
Maximum output voltage span of 4 × VREF (20 V)
Nominal output voltage range of -4 V to +8 V
Multiple, independent output span available
System calibration function allowing user-programmable
offset and gain
Clear function to user-defined SIGGND (CLR pin)
Simultaneous update of DAC outputs (LDAC pin)
Channel grouping and addressing features
Thermal Monitor Function
APPLICATIONS
Level setting in automatic test equipment (ATE)
Variable optical attenuators (VOA)
Optical switches
Industrial control systems
Instrumentation
FUNCTIONAL BLOCK DIAGRAM
DVCC
VDD
VSS
AGND DNGD
LDAC
VREF0
GROUP 0
BUFFER
16
CONTROL
REGISTER
14
16
14
16
OFFSET
DAC 0
OFS0
REGISTER
8
8
A/B SELECT
REGISTER
TO
MUX 2's
BUFFER
OUTPUT BUFFER
AND POWER
DOWN CONTROL
VOUT0
VOUT1
VOUT2
VOUT3
VOUT4
VOUT5
VOUT6
VOUT7
16
16
16
X2A REGISTER
DAC 0
REGISTER
16
A/B
MUX
2
DAC 0
X1 REGISTER
MUX
X2B REGISTER
16
16
·
·
·
·
·
·
M REGISTER
C REGISTER
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
16
·
·
·
·
·
·
16
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
OUTPUT BUFFER
AND POWER
16
16
16
16
X2A REGISTER
SERIAL
INTERFACE
16
DAC 7
A/B
MUX
2
SYNC
SDI
DAC 7
X1 REGISTER
DOWN CONTROL
SIGGND0
REGISTER
MUX
X2B REGISTER
16
16
M REGISTER
C REGISTER
16
SCLK
SDO
VREF1
GROUP 1
14
16
14
16
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
VOUT8
16
16
16
X2A REGISTER
16
DAC 0
REGISTER
A/B
MUX
2
DAC 0
X1 REGISTER
VOUT9
MUX
X2B REGISTER
16
16
VOUT10
VOUT11
VOUT12
VOUT13
VOUT14
VOUT15
M REGISTER
C REGISTER
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
STATE
MACHINE
16
·
·
·
·
·
·
16
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
16
OUTPUT BUFFER
AND POWER
·
16
16
16
POWER-ON
RESET
16
X2A REGISTER
DAC 7
16
A/B
MUX
2
DAC 7
X1 REGISTER
DOWN CONTROL
SIGGND1
REGISTER
MUX
X2B REGISTER
16
16
M REGISTER
C REGISTER
16
AD5370
VREF1 SUPPLIES
GROUP 1 TO GROUP 4
VOUT16
TO
VOUT39
GROUP 2 TO GROUP 4
ARE IDENTICAL TO GROUP 1
5370-0001C
SIGGND3
SIGGND4
SIGGND2
Figure 1.
AD5370—Protected by U.S. Patent No. 5,969,657; other patents pending
Rev. PrF
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