AD7607 datasheet(3/32 Pages) AD

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Data Sheet

AD7608

Rev. A | Page 3 of 32

GENERAL DESCRIPTION

The AD7608 is an 18-bit, 8-channel simultaneous sampling,

analog-to-digital data acquisition system (DAS). The part contains

analog input clamp protection, a second-order antialiasing filter,

a track-and-hold amplifier, an 18-bit charge redistribution

successive approximation analog-to-digital converter (ADC), a

flexible digital filter, a 2.5 V reference and reference buffer, and

high speed serial and parallel interfaces.

The AD7608 operates from a single 5 V supply and can

accommodate ±10 V and ±5 V true bipolar input signals while

sampling at throughput rates up to 200 kSPS for all channels.

The input clamp protection circuitry can tolerate voltages up

to ±16.5 V. The AD7608 has 1 MΩ analog input impedance

regardless of sampling frequency. The single supply operation,

on-chip filtering, and high input impedance eliminate the need

for driver op amps and external bipolar supplies. The AD7608

antialiasing filter has a 3 dB cutoff frequency of 22 kHz and

provides 40 dB antialias rejection when sampling at 200 kSPS.

The flexible digital filter is pin driven, yields improvements in

SNR, and reduces the 3 dB bandwidth.

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