AD5933WYRSZ-REEL7

Overview

The AD5933WYRSZ-REEL7 is a high-precision impedance converter system solution manufactured by Analog Devices Inc. It integrates an on-board frequency generator with a 12-bit, 1 MSPS analog-to-digital converter (ADC). The device excites external complex impedances with known frequencies and processes the response signal using an internal discrete Fourier transform (DFT) engine to return real and imaginary data words. Key specifications include a maximum output frequency of 100 kHz, a frequency resolution of 27 bits (<0.1 Hz), and an impedance measurement range from 1 kΩ to 10 MΩ. It operates on a 2.7 V to 5.5 V supply, features an I²C interface, and includes an internal temperature sensor with ±2°C accuracy.

Feature Summary

• Integrates a Direct Digital Synthesis (DDS) core for programmable frequency generation up to 100 kHz.
• Includes a 12-bit ADC sampling at 1 MSPS coupled with an onboard DSP engine performing a 1024-point DFT.
• Provides serial I²C communication for control and data retrieval of real and imaginary impedance components.
• Features an internal temperature sensor calibrated for automotive-grade reliability.

Applications

• Electrochemical analysis
• Bioelectrical impedance analysis
• Impedance spectroscopy
• Corrosion monitoring and protection equipment
• Fuel/battery cell condition monitoring

Procurement Notes

Verify the specific suffix REEL7 indicates reel packaging when sourcing. Confirm the Y grade designation corresponds to the extended industrial temperature range of −40°C to +125°C. Ensure the I²C pull-up resistors are correctly implemented in the host design as specified in the datasheet timing characteristics.

Selection Notes

Select this component for applications requiring precise magnitude and phase calculation of complex impedances without external DSP hardware. Consider the 100 Ω to 1 kΩ measurement limitation which requires additional buffer circuitry. Evaluate the need for an external master clock versus the internal oscillator based on required frequency stability and accuracy.

Part Context

This part belongs to the AD5933 family of impedance converters. It is functionally similar to the AD5934 but offers a higher sampling rate of 1 MSPS compared to the AD5934's 250 kSPS. Both devices share the same 16-lead SSOP package and core architecture, differing primarily in throughput capabilities.

Replacement Considerations

The AD5934 is a documented alternative within the same product family, offering identical functionality at a reduced sampling rate of 250 kSPS. Verify pin compatibility and software register mapping if substituting, as both utilize the same I²C interface structure.

FAQ

How is the impedance magnitude calculated?

The magnitude is calculated off-chip using the real (R) and imaginary (I) data words returned by the DFT engine, following the formula: Magnitude = √(R² + I²).

What is the standard impedance measurement range?

The standard range is 1 kΩ to 10 MΩ. Measurements between 100 Ω and 1 kΩ require additional external buffer circuitry.

Can the device operate without an external clock?

Yes, the AD5933 includes an internal oscillator that can be selected via the control register, though an external MCLK can also be used for potentially higher precision.