AD7747 is a high-resolution Σ-Δ type capacitance-to-digital converter (CDC) with features such as high resolution (24-bit no missing code, up to 19.5-bit effective resolution), high linearity (±0.01%), and high accuracy (±10 fF factory calibration). The product also has a built-in temperature sensor and I2C serial interface.
The AD7747 is a high-resolution, sigma-delta capacitive digital converter (CDC) designed for interfacing with single-ended or differential grounded capacitive sensors. It features 24-bit resolution, high linearity, and high accuracy, with a full-scale input range of ±8.192 pF. The device includes an internal temperature sensor, voltage reference, and clock generator, requiring no external components for basic operation. This manual is written in Chinese.
| Effective Resolution | 19.1 Bit |
|---|---|
| Input Range | ±8.192 pF |
| Linearity | ±0.01 % of FSR |
| Supply Voltage | 2.7 V to 5.25 V |
| Operating Temperature | -40°C to +125°C |
| Package | 16-lead TSSOP |
It uses a two-wire I2C compatible serial interface.
No, it is designed for grounded sensors; floating sensors require the AD7745 or AD7746.