The AD7782 is a complete analog front end for low-frequency measurement applications. The 24-bit sigma-delta ADC contains two fully differential analog input channels that can be used for sensor measurement, industrial process control, temperature measurement, pressure measurements, weigh scales, and portable instrumentation.
The AD7782 is a 24‑bit sigma‑delta ADC designed for low‑frequency measurement applications. It provides two fully differential analog input channels that can be configured for a gain of 1 or 16, giving input ranges of +160 mV or +2.56 V. The device operates from a single 3 V or 5 V supply and features a simple read‑only serial interface that can be used in master or slave mode.
Key features include a fixed 19.79 Hz output update rate with simultaneous 50 Hz and 60 Hz line‑frequency rejection, pin‑configurable input selection and range, and low power consumption (1.3 mA normal, 9 pA power‑down). The ADC is supplied in a 16‑lead TSSOP package and is suitable for sensor measurement, industrial process control, temperature and pressure measurement, and portable instrumentation.
| Output Update Rate | 19.79 Hz |
|---|---|
| Resolution (+160 mV range) | 16.5 bits p‑p |
| Normal Mode Power Consumption (3 V) | 1.3 mA typ |
| Power‑Down Current | 9 pA |
| Supply Voltage Range | 2.7 V‑3.6 V or 4.75 V‑5.25 V |
| Input Range Selectable | +160 mV or +2.56 V |
| DC Input Current | 1 nA max |
| Start‑up Time | 300 ms typ |
| Package | 16‑lead TSSOP |
| Operating Temperature Range | -40 °C to +85 °C |
The AD7782 provides a fixed output update rate of 19.79 Hz.
It has two fully differential analog input channels.
The device can operate from a single 3 V or 5 V supply, with allowable ranges of 2.7‑3.6 V or 4.75‑5.25 V.
It supports SPI™, QSPI™, Microwire™, and a 3‑wire serial interface.