The AD7731 is a 24-bit sigma-delta ADC with a proprietary programmable gain front end that allows it to accept a range of input signal ranges, including low level signals, directly from a transducer. The part features three buffered differential programmable gain analog inputs.
The AD7731 is a complete analog front‑end for process‑control applications. It features a proprietary programmable‑gain front end, three buffered differential inputs, a differential reference, and a sigma‑delta modulator that provides 24‑bit resolution. The device operates from a single +5 V supply and supports seven unipolar and seven bipolar input ranges.
The datasheet includes functional block diagrams, pin configurations, timing characteristics, absolute maximum ratings, ordering information, and detailed specifications such as input bias currents, power consumption, and temperature range. Various package options (PDIP, SOIC, TSSOP) are listed for different design needs.
| Resolution | 16‑bit peak‑to‑peak at 800 Hz |
|---|---|
| Supply Voltage | Single +5 V |
| Power Consumption (Normal Mode) | 67.5 mW max |
| Operating Temperature Range | –40 °C to +85 °C |
| Package Options | 24‑lead PDIP, SOIC, TSSOP |
The device operates from a single +5 V supply.
A 16‑bit peak‑to‑peak resolution is achievable at 800 Hz.
The AD7731 is offered in 24‑lead PDIP, SOIC, and TSSOP packages.