REV. A

–12–

AD7725

Pin No.

Mnemonic S/P

Description

38

SDO/DB8

Serial Mode. SDO–Serial Data Output. The serial data is shifted out of the AD7725 MSB

first, in twos complement format, synchronous with SCO.

Parallel Mode. DB8–Data Input/Output Bit.

39

DV

DD

Digital Power Supply Voltage.

40

SCO/DB7

Serial Mode. SCO–Serial Clock Output. The frequency of SCO is a function of the CLKIN

frequency and is set by the SCR pin. When configuration data is being loaded into the

AD7725, SCO = f

Parallel Mode. DB7–Data Input/Output Bit.

41

FSI/DB6

Serial Mode. FSI–Frame Synchronization Input. FSI indicates the beginning of a word

transmission on the SDI pin.

Parallel Mode. DB6–Data Input/Output Bit.

42

INIT/DB5

Serial Mode. INIT–Logic Input. When the device is correctly configured, a logic low on this

pin will prevent the device from converting. When this pin is taken high, the device will start

converting. When daisy-chaining multiple devices, this pin ensures that all devices sample their

analog inputs simultaneously without needing to activate the SYNC pin.

Parallel Mode. DB5–Data Input/Output Bit.

43

RESETCFG/DB4

Serial Mode.

RESETCFG–Logic Input. RESETCFG is used to reset the part when a

configuration error occurs. A low pulse on this pin will reset the part, and the configuration

file will be downloaded again. The

SOE pin will go high following a pulse on the RESETCFG

pin and then again following a successful configuration.

Parallel Mode. DB4–Data Input/Output Bit.

44

DGND/DB3

Serial Mode. DGND–Digital Ground.

Parallel Mode. DB3–Data Input/Output Bit.