The AD7787 is a low power, complete analog front end for low frequency measurement applications. It contains a low noise, high resolution, Σ-Δ ADC with a dither modulator, low pass filter, and output buffer. The AD7787 can be interfaced to a microcontroller or DSP through analog interfaces, and can communicate with a PC through digital interfaces.
The AD7787 is a low‑power, 24‑bit sigma‑delta ADC designed for low‑frequency measurement applications such as smart transmitters, battery monitoring, and sensor measurement. It operates from a 2.5 V to 5.25 V supply and provides a 19.5‑bit peak‑to‑peak resolution at a 9.5 Hz update rate.
The document includes full specifications, timing characteristics, absolute maximum ratings, pin configuration, grounding and layout recommendations, and an ordering guide. It also offers guidance on using the internal reference, Vop monitoring, and interfacing via 3‑wire serial protocols (SPI, QSPI, MICROWIRE, DSP).
| Power Supply Voltage | 2.5 V to 5.25 V |
|---|---|
| RMS Noise | 1.1 pV rms at 9.5 Hz |
| Resolution | 19.5‑bit p‑p (22‑bit effective) |
| Integral Nonlinearity | 3.5 ppm typical |
| Operating Temperature Range | -40 °C to +105 °C |
| Output Update Rate | 9.5 Hz to 120 Hz |
| Package | 10‑lead MSOP |
The AD7787 operates from 2.5 V to 5.25 V.
The RMS noise is 1.1 pV at a 9.5 Hz update rate.
It is supplied in a 10‑lead MSOP package.
The device operates from –40 °C to +105 °C.