This is a 3-channel, low noise, low power, 16/24-bit sigma-delta ADC with on-chip instrumentation amplifier, produced by Analog Devices.
The AD7798 and AD7799 are low‑power, low‑noise sigma‑delta analog‑to‑digital converters designed for high‑precision measurement applications such as weigh scales, pressure measurement, and strain‑gauge transducers. They feature programmable gain, on‑chip instrumentation amplifiers, and selectable update rates from 4.17 Hz to 470 Hz.
The devices operate from a 2.7 V to 5.25 V supply, are housed in a 16‑lead TSSOP package, and support SPI, QSPI, Microwire, and DSP‑compatible serial interfaces. Detailed specifications, timing characteristics, and pin descriptions are provided throughout the document.
| Output update rate | 4.17 Hz to 470 Hz |
|---|---|
| Resolution | 16‑bit (AD7798) / 24‑bit (AD7799) |
| RMS noise (AD7799) | 27 nV at 4.17 Hz |
| Operating temperature range | -40 °C to +105 °C |
| Package | 16‑lead TSSOP |
The output update rate can be programmed between 4.17 Hz and 470 Hz.
The ADCs are specified for -40 °C to +105 °C.
Both devices are supplied in a 16‑lead TSSOP package.