The AD7191 is a 24-bit sigma-delta ADC with ultralow noise and programmable output rate, gain, power down, and reset. The AD7191 is a low power, high performance ADC that is ideal for bridge sensor applications.
The AD7191 is a pin‑programmable, ultra‑low‑noise 24‑bit sigma‑delta ADC designed for bridge sensor applications such as weigh scales, strain gauges, and pressure measurement. It offers selectable output data rates, programmable gain, and an internal temperature sensor, all controlled via dedicated pins.
The device operates from a 3 V to 5.25 V supply, consumes about 4.35 mA, and is supplied in a 24‑lead TSSOP package. It supports 2‑wire serial interfaces compatible with SPI, QSPI™, and MICROWIRE™ and includes features like bridge power‑down switching and simultaneous 50 Hz/60 Hz rejection.
| Power Supply Voltage | 3 V to 5.25 V |
|---|---|
| Supply Current | 4.35 mA typical |
| Temperature Range | -40 °C to +105 °C |
| Package | 24‑lead TSSOP |
| Output Data Rate | 10, 50, 60, 120 Hz |
| Programmable Gain | 1, 8, 64, 128 |
| RMS Noise (gain = 128) | 15 nV @10 Hz |
The AD7191 operates from 3 V to 5.25 V.
Typical supply current is 4.35 mA.
It is available in a 24‑lead TSSOP package.
It supports a 2‑wire serial interface compatible with SPI, QSPI™, and MICROWIRE™.