AD7745/AD7746 is a 24-bit capacitance-to-digital converter with temperature sensor.
The AD7745 and AD7746 are 24‑bit Σ‑Δ capacitance‑to‑digital converters with an integrated temperature sensor. They support single‑ended or differential floating sensor inputs, offer resolution down to 4 aF, and provide a programmable on‑chip CAPDAC for offset calibration. The devices operate from a single 2.7 V to 5.25 V supply and are housed in a 16‑lead TSSOP package.
Typical applications include automotive, industrial, and medical pressure measurement, position and level sensing, flow‑metering, humidity detection, and impurity detection. The datasheet includes specifications, timing diagrams, pin descriptions, performance curves, and an ordering guide.
| Capacitance accuracy | ±4 fF |
|---|---|
| Supply voltage | 2.7 V to 5.25 V (single‑supply) |
| Supply current | 0.7 mA typical |
| Operating temperature range | –40 °C to +125 °C |
| Package | 16‑lead TSSOP |
| Update rate | 10 Hz to 90 Hz |
| Temperature sensor resolution | 0.1 °C |
It operates from a single supply of 2.7 V to 5.25 V.
The temperature sensor provides 0.1 °C resolution with ±2 °C accuracy.
Typical current consumption is about 0.7 mA.