REV. PrA

PRELIMINARY TECHNICAL DATA

–8–

AD7667

33

RESET

DI

Reset Input. When set to a logic HIGH, reset the AD7667. Current conversion if any is

aborted. If not used, this pin could be tied to DGND.

34

PD

DI

Power-Down Input. When set to a logic HIGH, power consumption is reduced and conver

sions are inhibited after the current one is completed.

35

CNVST

DI

Start Conversion. A falling edge on

CNVST puts the internal sample/hold into the hold state

and initiates a conversion. In impulse mode (IMPULSE HIGH and WARP LOW), if

CNVST is held low when the acquisition phase (t

is put into the hold state and a conversion is immediately started.

36

AGND

P

Must Be Tied to Analog Ground

37

REF

AI

Reference Input Voltage

38

REFGND

AI

Reference Input Analog Ground

39

INGND

AI

Analog Input Ground

43

IN

AI

Primart Analog Input with a Range of 0 to 2.5 V.

45

TEMP

AO

Temperature sensor voltage output.

46

REFBUFIN

AI/O

Reference Input Voltage. The reference output and the reference buffer input.

47

PDREF

DI

Allows choice of Internal or External voltage reference. When HIGH, the internal refer-

ence is switched off and an external reference must be used. When low,the on-chip refer

ence is turned on.

48

PDBUF

DI

Allows choice of buffering internal reference. When LOW, the buffer is selected. When

HIGH, the buffer is switched off.

NOTES

AI = Analog Input

AI/O = Bidirectional Analog

AO = Analog Output

DI = Digital Input

DI/O = Bidirectional Digital

DO = Digital Output

P = Power

Pin No.

Mnemonic

Type

Description