The document describes an 18-bit, 1.5 LSB INL, 250 kSPS PulSAR differential ADC with features such as high resolution, low noise, and wide dynamic range.
The AD7691 is an 18‑bit, charge‑redistribution, successive‑approximation ADC that operates from a single 2.3 V to 5.25 V supply. It provides true differential inputs, no missing codes, and a versatile SPI‑compatible serial interface that can be daisy‑chained and includes an optional busy indicator.
Key features include up to 250 kSPS conversion rate, dynamic range of 102 dB, standby current of 1 nA, and low power dissipation (1.35 mW at 2.5 V, 100 kSPS). The device is offered in 10‑lead MSOP and QFN packages and is rated for operation from –40 °C to +85 °C.
| Resolution | 18 Bits |
|---|---|
| Supply Voltage (VDD) | 2.3 V to 5.25 V |
| Standby Current | 1 nA |
It operates from a single supply voltage between 2.3 V and 5.25 V.
Yes, the serial interface provides an optional busy indicator.
The device draws only 1 nA in standby mode.