AD7195 is a 4.8 kHz, 24-bit Sigma-Delta ADC with PGA and AC excitation, featuring ultralow noise, and can be used for applications such as weigh scales, strain gauge transducers, pressure measurement, temperature measurement, and chromatography.
The AD7195 is a low‑noise, 24‑bit sigma‑delta analog‑to‑digital converter that includes an on‑chip programmable gain amplifier (gain 1‑128) and AC excitation for bridge sensors. It supports two differential or four pseudo‑differential input channels and offers simultaneous 50 Hz/60 Hz line‑noise rejection, making it suitable for weigh scales, strain‑gage transducers, pressure and temperature measurement, and data‑acquisition systems.
The datasheet is organized into sections covering features, interface options, applications, a functional block diagram, detailed specifications, timing characteristics, absolute maximum ratings, pin configuration, calibration procedures, filter options and grounding/layout recommendations. It also includes tables of electrical parameters, pin functions and ordering information.
| ADC Output Data Rate | 4.7 Hz – 4800 Hz (chop disabled) |
|---|---|
| Resolution | 24 bits (FS > 1, sinc4 filter) |
| Analog Supply Voltage (AVDD) | 4.75 V to 5.25 V |
| Digital Supply Voltage (DVDD) | 2.7 V to 5.25 V |
| Operating Temperature Range | –40 °C to +105 °C |
| Input Channels | 2 differential / 4 pseudo‑differential |
| Programmable Gain | 1 to 128 |
| RMS Noise (gain = 128) | 8.5 nV at 4.7 Hz |
The analog supply (AVDD) must be 4.75 V to 5.25 V and the digital supply (DVDD) must be 2.7 V to 5.25 V.
It provides two differential input channels or four pseudo‑differential input channels.
Yes, the device offers simultaneous 50 Hz/60 Hz rejection and includes a REJ60 bit to improve rejection.