This document describes a product with 3-channel, low noise, low power, 20-bit ∑-Δ ADC, on-chip In-Amp, and reference voltage. It features high resolution, low noise, and low power consumption, making it suitable for thermocouple, RTD, thermistor, and other measurement applications.
The AD7785 is a complete analog front‑end for high‑precision measurement applications. It integrates a 20‑bit sigma‑delta ADC, a low‑noise instrumentation amplifier, a band‑gap reference, and programmable current sources in a 16‑lead TSSOP package. The device operates from 2.7 V to 5.25 V and supports update rates from 4.17 Hz to 470 Hz.
Typical applications include industrial process control, portable instrumentation, blood analysis, smart transmitters, and chromatography. The datasheet provides detailed specifications, timing diagrams, pin descriptions, and absolute maximum ratings for designers.
| Resolution | Up to 20 bits effective |
|---|---|
| Power supply voltage | 2.7 V to 5.25 V |
| Operating temperature range | -40 °C to +105 °C |
| Update rate | 4.17 Hz to 470 Hz |
| Differential inputs | 3 |
| RMS noise (4.17 Hz) | 40 nV |
The device operates from 2.7 V to 5.25 V.
It has three differential inputs.
The AD7785 can operate up to +105 °C.