EVAL-AD5933

This user guide describes the EVAL-AD5933EBZ evaluation board, and the application software developed to interface with the device. The AD5933 is a high precision impedance converter system that combines an on-board frequency generator with a 12-bit, 1 MSPS analog-to-digital converter (ADC). The frequency generator allows an external complex impedance to be excited with a known frequency. The on-board ADC samples the response signal from the impedance, and an on-board DSP engine at each excitation frequency processes the DFT. The AD5933 also contains an internal temperature sensor with 13-bit resolution. The part operates from a 2.7 V to 5.5 V supply. Other on-board components include a ADR423 3.0 V reference to act as a stable supply voltage for the separate analog and digital sections of the device and a ADP3303 ultrahigh precision regulator to act as a supply to the on-board universal serial bus controller that interfaces to the AD5933. The user has the option to power the entire circuitry from the USB port of a computer.

The evaluation board also has a high performance trimmed 16 MHz surface-mount crystal to act as a system clock to the AD5933, if required. Interfacing to the AD5933 is through a USB microcontroller that generates the I2C signals necessary to communicate with the AD5933. Interfacing to the USB microcontroller is done through a Visual Basic® graphic user interface located on and run from the PC. Complete specifications for the AD5933 are available in the AD5933 data sheet available from Analog Devices, Inc., and should be consulted in conjunction with this user guide when using the evaluation board.