Digilent PmodIA Reference Manual

PmodIA™ Reference Manual
Revised January 20, 2016
This manual applies to the PmodIA rev. A
Overview
The PmodIA is an impedance analyzer built around the Analog Devices AD5933 12-bit Impedance Converter
Network Analyzer.
The PmodIA.
1 Functional Description
The PmodIA utilizes Analog Devices AD5933 with its on-board frequency generator and analog-to-digital converter
(ADC) to be able to excite an external unknown impedance at a known frequency. This known frequency is sent
out through one of the SMA connectors. The frequency response is captured by the other SMA connector and sent
to the ADC and a discrete Fourier transform (DFT) is performed on sampled data, storing the real and imaginary
parts of the solution in the on-chip data registers. The magnitude of the unknown impedance as well as the
relative phase of the impedance at each point in the generated frequency sweep can be calculated from these two
data words.
DOC#: 502-246
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Features include:

Impedance analyzer with 12-bit impedance
converter

Measure impedance values ranging from 100Ω
to 10 MΩ.

Programmable frequency sweep

Programmable gain amplifier

Optional external clock generation

Small PCB size for flexible designs 1.6 in × 0.8
in (4.1 cm × 2.0 cm)

2×4-pin connector with I²C interface

Follows Digilent Interface Specification

Library and example code available in
center
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