AD7794/AD7795 is a 6-channel, low noise, low power, 24-/16-bit ∑-Δ ADC with on-chip in-amp and reference.
The AD7795 (and its sibling AD7794) are low‑power, low‑noise, 16‑bit (AD7795) and 24‑bit (AD7794) sigma‑delta ADCs with six differential inputs and an on‑chip instrumentation amplifier. This handbook details the device architecture, electrical characteristics, pin configuration, timing diagrams, and recommended usage.
Key features include programmable gain (1‑128), internal band‑gap reference, low‑side power switch, and selectable update rates from 4.17 Hz to 470 Hz. The document also covers typical applications such as temperature, pressure, weight, strain‑gauge, and flow‑meter measurements, and provides an ordering guide and mechanical dimensions.
| Resolution | 16 bits (AD7795) |
|---|---|
| Power supply voltage | 2.7 V to 5.25 V |
| RMS noise (4.17 Hz) | 40 nV |
| Output update rate | 4.17 Hz to 470 Hz |
| Temperature range (B‑grade) | -40 °C to +105 °C |
| Temperature range (C‑grade) | -40 °C to +125 °C |
| Differential analog inputs | Six |
The AD7795 operates from a supply voltage of 2.7 V to 5.25 V.
At an update rate of 4.17 Hz the RMS noise is specified as 40 nV.
B‑grade parts are rated from –40 °C to +105 °C, while C‑grade parts are rated from –40 °C to +125 °C.
The device provides six differential analog inputs.