The AD7747 is a 24-bit capacitive-to-digital converter with temperature sensor. It provides a single-chip solution for single-ended or differential grounded sensors with up to 19.5-bit resolution. The device features 10 fF accuracy and 0.01% linearity. The AD7747 also provides 5 Hz to 45 Hz update rates, 50 Hz and 60 Hz simultaneous rejection, and a 0.1°C resolution and ±2°C accuracy temperature sensor.
The AD7747 is a high‑resolution Σ‑Δ capacitance‑to‑digital converter that supports single‑ended or differential grounded sensors. It provides a conversion range of ±8.192 pF, a typical resolution of 19.1 bits, and includes an on‑chip temperature sensor with 0.1 °C resolution. The device operates from a single 2.7 V to 5.25 V supply and is specified for automotive temperature ranges (‑40 °C to +125 °C).
The part features a 2‑wire I²C‑compatible serial interface, active AC shielding for sensor connections, and programmable CAPDACs for offset calibration. Detailed specifications, pin descriptions, timing diagrams, and typical performance graphs are provided throughout the document.
| Capacitive Input Conversion Range | ±8.192 pF |
|---|---|
| Effective Resolution | 19.1 bits |
| Supply Voltage | 2.7 V to 5.25 V |
| Operating Temperature Range | ‑40 °C to +125 °C |
| Input Noise (Capacitive Channel) | 11.0 aF/√Hz RMS |
The AD7747 provides an effective resolution of up to 19.1 bits.
It operates from a single supply of 2.7 V to 5.25 V.
Yes, it has an on‑chip temperature sensor with 0.1 °C resolution and ±2 °C accuracy.
It uses a 2‑wire I²C‑compatible serial interface (SCL, SDA).