Analog Devices: CN0217 Reference Design for High Accuracy Impedance Measurements Using 12-Bit Impedance Converters

atomar — Thu, 04 Apr 2013 11:07:46 GMT

Current Revision posted to Documents by atomar on 4/4/2013 11:07:46 AM

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Kit Overview

The AD5933AD5933 and AD5934AD5934 are high precision impedance converter system solutions that combine an on-chip programmable frequency generator with a 12-bit, 1 MSPS (AD5933) or 250 kSPS (AD5934) analog-to-digital converter (ADC). The tunable frequency generator allows an external complex impedance to be excited with a known frequency.

The AD5933AD5933 is a high precision impedance converter system solution 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 response signal from the impedance is sampled by the on-board ADC and a discrete Fourier transform (DFT) is processed by an on-board DSP engine. The DFT algorithm returns a real (R) and imaginary (I) data-word at each output frequency.

The AD5934AD5934 is a high precision impedance converter system solution that combines an on-board frequency generator with a 12-bit, 250 kSPS, analog-to-digital converter (ADC). The frequency generator allows an external complex impedance to be excited with a known frequency. The response signal from the impedance is sampled by the on-board ADC and a discrete Fourier transform (DFT) is processed by an on-board DSP engine. The DFT algorithm returns a real (R) and imaginary (I) data-word at each output frequency.

The circuit yields accurate impedance measurements extending from the low ohm range to several hundred kΩ and also optimizes the overall accuracy of the AD5933/AD5934.

Key Applications: Chemical Analysis, Electronic Test & Measurement, Instrumentation

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Technical Documents

Learning Center

Type	Description
User Manual	ADI: User Manual for CN-0217 High Accuracy Impedance Measurements Using 12-Bit Impedance Converters
User Manual	ADI: User Manule for CN0217 - the 1 MSPS 12-Bit Impedance Converter Network Analyzer
Datasheet	ADI: Datasheet for AD5933: 1 MSPS, 12-Bit Impedance Converter, Network Analyzer (Rev D)
Datasheet	ADI: Datasheet for AD5934: 250KSPS, 12-Bit Impedance Converter, Network Analyzer (Rev C)
Datasheet	ADI: Datasheet for AD8605/AD8606/AD8608 - Precision, Low Noise, CMOS, Rail-to-Rail, Input/Output Operational Amplifiers
Application Note	ADI: Application Note (AN-1053) for AD5933 Evaluation Board Example Measurement
Application Note	ADI: Application Note (AN-237) for Choosing DACs for Direct Digital Synthesis

Design Elements

Type	Description
Schematics	ADI: Schematics for EVAL-CN0217-EB1Z Evaluation Board
Layout	ADI: Layout for EVAL-CN0217-EB1Z
BOM	ADI: Bill of Material (BOM) for EVAL-CN0217-EB1Z Evaluation Board
Reference Design	ADI: Reference Design for AD5933 Pmod Xilinx FPGA

Video

Kit Features

Key Features for AD5933AD5933:

Programmable output peak-to-peak excitation voltage to a maximum frequency of 100 kHz
Programmable frequency sweep capability with serial I2C interface
Frequency resolution of 27 bits (<0.1 Hz)
Impedance measurement range from 1 kΩ to 10 MΩ
Capable of measuring of 100 Ω to 1 kΩ with additional circuitry
Internal temperature sensor (±2°C)
Internal system clock option
Phase measurement capability
System accuracy of 0.5%
2.7 V to 5.5 V power supply operation

Key Features for AD5934AD5934:

Programmable output peak-to-peak excitation voltage to a maximum frequency of 100 kHz
Programmable frequency sweep capability with serial I2C interface
Frequency resolution of 27 bits (<0.1 Hz)
Impedance measurement range from 1 kΩ to 10 MΩ
Capable of measuring 100 Ω to 1 kΩ with additional circuitry
Phase measurement capability
System accuracy of 0.5%
2.7 V to 5.5 V power supply operation

Kit Contents

The Analog Devices EVAL-CN0217-EB1ZEVAL-CN0217-EB1Z kit is supplied with below contents:

Evaluation Board

Tags: ad5933, ad8606, ad5934, analog_devices, eval-cn0217-eb1z