–9–

REV. PrB

PRELIMINARYTECHNICALDATA

Preliminary Technical Data

AD7273/AD7274

PIN FUNCTION DESCRIPTION

Pin

Mnemonic

Function

CS

Chip Select. Active low logic input. This input provides the dual function of initiating

conversion on the AD7273/AD7274 and also frames the serial data transfer.

G N D

Analog Ground. Ground reference point for all circuitry on the AD7273/AD7274. All

analog input signals should be referred to this GND voltage.

Voltage Reference Input. This pin becomes the reference voltage input and an external

TBD µF capacitor should be tied between this pin and AGND.

SDATA

Data Out. Logic output. The conversion result from the AD7273/AD7274 is provided on

this output as a serial data stream. The bits are clocked out on the falling edge of the SCLK

input. The data stream from the AD7274 consists of two leading zeros followed by the 12

bits of conversion data followed by two trailing zeros, which is provided MSB first. The data

stream from the AD7273 consists of two leading zeros followed by the 10 bits of conversion

data followed by four trailing zeros, which is provided MSB first.

SCLK

Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part.

This clock input is also used as the clock source for the AD7273/AD7274's conversion

process.