GENERAL DESCRIPTION

The AD5934 is a high precision impedance converter system solution which 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.

FEATURES

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

Phase measurement capability

System accuracy of 0.5

2.7 V to 5.5 V power supply operation

Temperature range −40°C to +125°C

16-lead SSOP package

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