AD7791 is a low power, buffered 24-bit Sigma-Delta ADC.
The AD7791 is a low‑power, complete analog front‑end for low‑frequency measurement applications. It features a 24‑bit sigma‑delta converter, selectable buffered or unbuffered differential input, and an internal clock that eliminates the need for an external reference.
The device operates from a 2.5 V to 5.25 V supply, offers programmable output data rates from 9.5 Hz to 120 Hz, and provides low RMS noise (1.1 µV at 9.5 Hz). It is housed in a 10‑lead MSOP package and is suited for smart transmitters, battery‑powered instruments, and sensor measurement systems.
| Power Supply Voltage | 2.5 V to 5.25 V |
|---|---|
| Normal Supply Current | 75 µA max |
| Power‑down Current | 1 µA max |
| RMS Noise (9.5 Hz) | 1.1 µV rms |
| Resolution | 19.5‑bit p‑p (22‑bit effective) |
| Operating Temperature Range | –40 °C to +105 °C |
| Package | 10‑lead MSOP |
The power‑down current is specified as 1 µA max.
The RMS noise is 1.1 µV at a 9.5 Hz update rate.
It operates from –40 °C to +105 °C.
The device is housed in a 10‑lead MSOP package.