The AD5933 and AD5934 are the world's first integrated impedance converters, combining a precision on-board frequency generator with 12-bit 1 MSPS (AD5933) and 250 KSPS (AD5934) ADCs.

The frequency generator allows an external complex impedance (range 100 Ω to 10 M Ω) to be excited with a known frequency of up to approximately 100 kHz. The response signal from the impedance is sampled by the on-board ADC and DFT processed by an on-board DSP engine.

The DFT algorithm returns a real (R) and imaginary (I) data word at each frequency point, (in the case of a sweep) allowing impedance to be conveniently calculated based on an initial system calibration.

For more information

Impedance vs. Frequency

The advanced integration of the AD5933

Impedance Converter Selection Table

Part # Impedance Range Resolution (Bits) Power Supply Temperature Range Sampling Speed On Chip Oscllator Temp Sensor Price
(1K Unit)
AD5933 100 Ohms to 10 MOhms 12 3 V / 5 V -40°C to 125°C 1 MSPS Yes Yes $6.65 Order Samples
AD5934 100 Ohms to 10 MOhms 12 3 V / 5 V -40°C to 125°C 250 kSPS - - $4.35 Order Samples

Technical Articles

Recent Developments for SAR and Sigma Delta ADCs (Industrial Control DesignLine)

Which ADC Architecture Is Right for Your Application? (Analog Dialogue, June 2005)

Product Reviews

ADI Rolls Out Single-Chip Converters for Precise Capacitance and Impedance Measurements


Please contact the IDC Development Group.

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