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3
Digital Interface
Digital Interface
Table 2. Jumper Setting
Reference
Pins/Pads
Description
Designator
1-2
2-3
SJP1
Buffer onboard reference (REF1004-2.5)
Shorted
(1)
Open
Buffer user supplied reference voltage applied at P1 pin 20.
Open
Shorted
SJP2
Connect external reference directly to SJP4
Shorted
(1)
Open
Connect buffered external reference to SJP4
Open
Shorted
SJP3
Connect U3 negative supply to ground
Shorted
Open
Connect U3 negative supply to –VCC
Open
Shorted
(1)
SJP4
Connect internal reference to REFIN
Shorted
(1)
Open
Connect external reference to REFIN
Open
Shorted
SJP5
Connect common-mode voltage to VOCM pin of THS4131
Shorted
(1)
N/A
W1
C5VD to BVDD
Shorted
(1)
Open
C3.3VD to BVDD
Open
Shorted
W3
Set power down signal (PD) high
Shorted
N/A
W4
Set frame sync signal (FS) high
Shorted
N/A
W5
Set chip select signal (CS) low
Shorted
(1)
N/A
(1)
Factory Installed
The ADS8372EVM is designed for easy interfacing to multiple platforms. Samtec plug and socket
connectors provide a convenient dual row header/socket combination at P1 and P2 to plug into prototype
boards or ribbon cable over to user system boards.
The digital input and output signals for the converter is available at connector P2 on the ADS8372EVM,
see
Table 3
for the connector pinout.
Table 3. Pinout for Serial Control Connector P2
Description
Signal Name
Connector Pin
Signal Name
Description
Chip Select
CS
P2.1
P2.2
N/A
Reserved
Serial Clock
SCLK
P2.3
P2.4
DGND
Ground
Reserved
N/A
P2.5
P2.6
N/A
Reserved
Frame Sync
FS
P2.7
P2.8
N/A
Reserved
Reserved
N/A
P2.9
P2.10
N/A
Reserved
Reserved
N/A
P2.11
P2.12
N/A
Reserved
Serial Data Out
SDO
P2.13
P2.14
N/A
Reserved
BUSY
BUSY
P2.15
P2.16
N/A
Reserved
Convert Start
CONVST
P2.17
P2.18
DGND
Ground
Power down
PD
P2.19
P2.20
N/A
Reserved
ADS8372EVM
4
SLAU160 – July 2005