GENERAL DESCRIPTION

The AD7891 is an 8-channel, 12-bit data acquisition system with a choice of either parallel or serial interface structure. The part contains an input multiplexer, an on-chip track/hold amplifier, a high speed 12-bit ADC, a 2.5 V reference, and a high speed interface. The part operates from a single 5 V supply and accepts a variety of analog input ranges across two models, the AD7891-1 (±5 V and ±10 V) and the AD7891-2 (0 V to +2.5 V, 0 V to +5 V, and ±2.5 V).

FEATURES

Fast 12-Bit ADC with 1.6 μs Conversion Time

8 Single-Ended Analog Input Channels

Overvoltage Protection on Each Channel

Selection of Input Ranges: ±5 V, ±10 V for AD7891-1 0 to +2.5 V, 0 to +5 V, ±2.5 V for AD7891-2

Parallel and Serial Interface

On-Chip Track/Hold Amplifier

On-Chip Reference

Single-Supply, Low Power Operation (100 mW Max)

Power-Down Mode (75 μW Typ)

APPLICATIONS

Data Acquisition Systems

Motor Control

Mobile Communication Base Stations

Instrumentation