AD7142 is a programmable controller for capacitance touch sensors. It has a 36ms update rate, 1fF resolution, 14 input channels, automatic calibration logic, environmental compensation, and is suitable for handheld devices, digital cameras, etc.
The AD7142 is an integrated capacitance-to-digital converter (CDC) designed for use in systems requiring novel user input methods. It features 14 capacitance sensor input channels channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta converter. The device includes on-chip environmental calibration logic and automatic compensation for environmental changes.
| Update Rate | 36 ms (maximum) |
|---|---|
| Resolution | 16 Bit |
| CIN Input Range | +/-2 pF |
| Supply Voltage | 2.6 V to 3.6 V |
| Operating Current (Low Power) | 50 pA |
The maximum update rate is 36 ms when using the maximum sequence length.
The device has 14 capacitance sensor input channels.