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AD5933:  1 MSPS, 12 BIT IMPEDANCE CONVERTER NETWORK ANALYZER

The AD5933 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 ...More

AD5933:  1 MSPS, 12 BIT IMPEDANCE CONVERTER NETWORK ANALYZER

Product Description

The AD5933 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. Once calibrated, the magnitude of the impedance and relative phase of the impedance at each frequency point along the sweep is easily calculated using the following two equations:

Magnitude = √ R2 + I2
Phase = Tan-1 (I/R)

A similar device, also available from Analog Devices, Inc., is the AD5934, a 2.7 V to 5.5 V, 250 kSPS, 12-bit impedance converter, with an internal temperature sensor and is packaged in a 16-lead SSOP.

Applications

  • Electrochemical analysis
  • Bioelectrical impedance analysis
  • Impedance spectroscopy
  • Complex impedance measurement
  • Corrosion monitoring and protection equipment
  • Biomedical and automotive sensors
  • Proximity sensing
  • Nondestructive testing
  • Material property analysis
  • Fuel/battery cell condition monitoring

    • Data Sheet, Rev. A, 5/08

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    • Programmable output peak-to-peak excitation voltage to a max frequency of 100 kHz
    • Programmable frequency sweep capability with serial I2C® interface
    • Frequency resolution of 27 bits (<0.1 Hz)
    • Impedance measurement range from 100 Ω to 10 MΩ
    • Internal temperature sensor (±2°C)
    • Phase measurement capability
    • System accuracy of 0.5%
    • See Data Sheet for Additional Information
    • Compliance Range (V): n/a
    • I Supply total (max): 15mA
    • I/O Interface: Serial
    • Master fclk : 16.776MHz
    • Nominal Supply (V): Single(+5)
    • On-Board Comparator: n/a
    • Resolution (Bits): 12bit

    Functional Block Diagram for AD5933

    OF NOTE ...

    Visit the AD5933/34 Impedance to Digital Converter Demonstration/Configuration Assistant ... This tool is both a demonstration and design tool for the AD5933 and AD5934 impedance converter parts. It demonstrates the steps needed to configure and use the parts before purchasing an evaluation board. A design mode is also available which permits free control of the user interface and the calculation of values for programming the internal registers.

    Technical Article: Blood Analysis Systems Require Wide Bandwidths and Fast Sample Processing Cycles and Analysis

    For additional ADI Healthcare Products and related information, please visit www.analog.com/healthcare.

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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.