REV. B

AD7470/AD7472

–8–

PIN FUNCTION DESCRIPTIONS (continued)

Mnemonic

Function

DGND

Digital Ground. This is the ground reference point for all digital circuitry on the AD7470 and AD7472. The

DGND and AGND voltages should ideally be at the same potential and must not be more than 0.3 V apart even

on a transient basis.

Analog Input. Single-ended analog input channel. The input range is 0 V to REF IN. The analog input presents a

high dc input impedance.

Supply Voltage for the Output Drivers, 2.7 V to 5.25 V. This voltage determines the output high voltage for the

(ADC), while the digital outputs can interface to 3 V logic.

DB0–DB9/11

Data Bit 0 to Data Bit 9 (AD7470) and DB11 (AD7472). Parallel digital outputs that provide the conversion result

for the part. These are three-state outputs that are controlled by

CS and RD. The output high voltage level for these