Design guide for PCB implementation of AD7142/AD7143 capacitive sensors, covering layout, sensor types, and connection details.
This application note provides detailed guidance for designing PCB layouts that integrate the AD7142 and AD7143 capacitive digital converters. It describes sensor types, dimensions, bulk capacitance values, and the impact of sensor area on performance.
The document also explains wiring recommendations, sequencer configuration, and integration tips for embedding sensors in consumer electronics such as MP3 players, phones, and cameras. Reference designs and example layouts are included to help engineers quickly prototype reliable sensor solutions.
| Maximum offset DAC compensation | ±20 pF |
|---|---|
| Trace width | 0.2 mm |
| Minimum trace spacing | 0.15 mm |
| PCB layer thickness | 0.1 mm |
| CIN inputs per scroll‑bar segment | 1 (8 total) |
The offset DAC can compensate up to ±20 pF of bulk capacitance.
A trace width of 0.2 mm is recommended.