The AD7796/AD7797 are complete analog front ends for high precision, bridge sensor applications such as weigh scales. The AD7796/AD7797 contain a Σ-Δ ADC capable of 16-/24-bit resolution, respectively. The on-chip instrumentation amplifier has a gain-bandwidth product of up to 1000 V/V, which can be used with high impedance sensors.
The AD7796 and AD7797 are low‑power, 16‑/24‑bit sigma‑delta ADCs designed for bridge‑sensor applications such as weigh scales and industrial process control. The devices include an on‑chip instrumentation amplifier with a fixed gain of 128, a temperature sensor for bridge compensation, and support for 3‑wire serial interfaces (SPI, QSPI, MICROWIRE, DSP). They operate from a 2.7 V to 5.25 V supply and offer programmable output data rates from 4.17 Hz to 123 Hz.
This handbook provides detailed specifications, pin configurations, timing characteristics, absolute maximum ratings, and example application circuits. It also includes an ordering guide and mechanical drawing of the 16‑lead TSSOP package.
| Power supply voltage (AVpp/DVpp) | 2.7 V to 5.25 V |
|---|---|
| RMS noise | 65 nV |
| Output update rate | 4.17 Hz to 123 Hz |
| Operating temperature range | -40 °C to +85 °C |
The devices operate from 2.7 V to 5.25 V on both analog (AVpp) and digital (DVpp) supplies.
The RMS noise is specified as 65 nV.
They are rated for operation from –40 °C to +85 °C.
The output update rate can be programmed between 4.17 Hz and 123 Hz.