The AD7190 is a 4.8 kHz ultralow noise 24-bit Sigma-Delta ADC with PGA. The device offers ultralow noise of 8.5 nV RMS at 4.7 Hz (gain = 128), 16 noise free bits at 2.4 kHz (gain = 128), and up to 22.5 noise free bits (gain = 1). It provides two differential/four pseudo differential input channels, automatic channel sequencer, programmable gain (1 to 128), four general-purpose digital outputs, 3-wire serial SPI, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on SCLK, and simultaneous 50 Hz/60 Hz rejection.
The AD7190 is a low‑noise, 24‑bit sigma‑delta ADC designed for high‑precision measurement applications. It offers a programmable gain range of 1‑128, two differential or four pseudo‑differential input channels, and an on‑chip 4.92 MHz clock that can be used internally or replaced by an external source.
The device operates from a 5 V analog supply (4.75‑5.25 V) and a 2.7‑5.25 V digital supply, consuming about 6 mA. It supports a 3‑wire serial SPI interface, provides four general‑purpose digital outputs, and includes features such as simultaneous 50 Hz/60 Hz line‑frequency rejection and configurable output data rates from 4.7 Hz to 4.8 kHz.
| RMS noise | 8.5 nV @ 4.7 Hz (gain = 128) |
|---|---|
| Output data rate | 4.7 Hz to 4.8 kHz |
| Analog supply voltage (AVon) | 4.75 V to 5.25 V |
| Digital supply voltage (DVpp) | 2.7 V to 5.25 V |
| Supply current | 6 mA |
| Operating temperature range | -40 °C to +105 °C |
| Input channels | 2 differential / 4 pseudo‑differential |
| Programmable gain | 1 to 128 |
| Interface | 3‑wire serial SPI |
| General‑purpose digital outputs | 4 |
The RMS noise is 8.5 nV at 4.7 Hz when the gain is set to 128.
It needs an analog supply of 4.75 V to 5.25 V and a digital supply of 2.7 V to 5.25 V.
The device operates from –40 °C up to +105 °C.
It provides two differential and four pseudo‑differential input channels.