Evaluation board for capacitance-to-digital converter

Analog Devices Inc. EVAL-CN0552-PMDZ Evaluation Board, available now from Mouser, is a demonstration and development platform for the AD7746 Capacitance-to-Digital Converter (CDC). The board comprises of a second-order (Σ-Δ or charge balancing) modulator and a third-order digital filter. It functions as a CDC for the capacitive inputs and as a classic ADC for the voltage input or the voltage from a temperature sensor.

In addition to the converter, the board combines a multiplexer, an excitation source and CAP DACs for the capacitive inputs, a temperature sensor, a voltage reference for the voltage and temperature inputs, a complete clock generator, control and calibration logic, and an I2C-compatible serial interface. The device provides two capacitive inputs, which can be configured as single-ended or differential.

The Evaluation Board incorporates a pre-mounted AD7746 CDC in a 16-lead TSSOP package. It features an I2C Pmod connector and is designed for use with the EVAL-ADICUP3029 Development Board (not included).