This document describes the AD7194, an 8-channel, 4.8 kHz ultralow noise, 24-bit Sigma-Delta ADC. It features a fast settling filter option, 8 differential/16 pseudo differential input channels, 11 nV RMS noise, 15.5 noise-free bits, programmable gain, and more.
The AD7194 is an 8‑channel, 4.8 kHz, ultralow‑noise 24‑bit sigma‑delta ADC with programmable gain (1‑128) and a flexible digital filter. It includes differential and pseudo‑differential inputs, on‑chip reference options, and supports both internal and external clocks.
The document provides a functional block diagram, detailed pin descriptions, timing characteristics, absolute maximum ratings, thermal resistance data, and application notes such as flow‑meter implementations. It also outlines the serial interface (SPI/QSPI/MICROWIRE) and register map for configuration and data acquisition.
| Output data rate | 4.7 Hz to 4.8 kHz |
|---|---|
| RMS noise (gain = 128, 4.7 Hz) | 11 nV |
| Noise‑free bits (gain = 128, 2.4 kHz) | 15.5 bits |
| Noise‑free bits (gain = 1) | Up to 22 bits |
| Power‑supply voltage (AVDD) | 3 V to 5.25 V |
| Power‑supply voltage (DVDD) | 2.7 V to 5.25 V |
| Supply current | 4.65 mA |
| Operating temperature range | −40 °C to +105 °C |
| Package | 32‑lead LFCSP |
| Programmable gain | 1 to 128 |
The AD7194 can operate with an output data rate from 4.7 Hz up to 4.8 kHz.
The RMS noise is 11 nV under those conditions.
It operates from –40 °C to +105 °C.
The device is supplied in a 32‑lead LFCSP package.