ADI’s AD7770 is an 8-channel, simultaneous sampling ADC. Eight full sigma-delta (Σ-Δ) ADCs are on chip. The device provides a low input current to allow direct sensor connection. Each input channel has a programmable gain stage allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor outputs into the full-scale ADC input range, maximizing the dynamic range of the signal chain. The AD7770 accepts a V_REF voltage from 1 V up to 3.6 V. The analog inputs accept unipolar (0 V to V_REF) or true bipolar (±V_REF/2) analog input signals with 3.3 V or ±1.65 V analog supply voltages, respectively, for PGAGAIN = 1. The analog inputs can accept true differential, pseudo differential, or single-ended signals to match different sensor output configurations.

The AD7770 offers two modes of operation: high-resolution mode and low power mode. High-resolution mode provides a higher dynamic range while consuming 10.75 mW per channel; low power mode consumes just 3.37 mW per channel at a reduced dynamic range specification. This device comes in a 64-lead LFCSP package and was designed for general-purpose data acquisition applications.