AD5940BCBZ-RL

Overview

The AD5940BCBZ-RL is a high precision, low power analog front end (AFE) designed for portable electrochemical and bioimpedance applications. It features a 16-bit SAR ADC with data rates up to 800 kSPS and includes two excitation loops: a low-power loop with dual-output DACs and a potentiostat, and a high-speed loop with a 12-bit DAC capable of generating signals up to 200 kHz. The device integrates programmable gain amplifiers, transimpedance amplifiers, and a complex impedance measurement engine. Operating from a 2.8 V to 3.6 V supply, it is housed in a 56-ball WLCSP package rated for -40°C to +85°C.

Feature Summary

• 16-bit ADC with 800 kSPS sampling rate and built-in antialias filter
• Dual excitation loops including a low-power potentiostat and high-speed 12-bit DAC
• Integrated digital waveform generator and DFT-based impedance measurement engine
• Programmable switch matrix with ultralow leakage for sensor interfacing

Applications

• Electrochemical gas sensing
• Bioimpedance analysis and skin impedance measurement
• Potentiostat and amperometric/voltammetric measurements
• Continuous glucose monitoring systems

Procurement Notes

Verify the specific suffix RL7 or RL against the manufacturer's current ordering guide to confirm reel quantity and tape specifications. Confirm that the WLCSP package dimensions match the PCB footprint requirements. Ensure the operating temperature range aligns with the system environment constraints.

Selection Notes

Select this component for applications requiring high-precision impedance and current measurements in portable devices. Compare the AD5940 WLCSP package against the AD5941 LFCSP option if board space allows for larger footprints. Consider the integrated sequencer capabilities to reduce host processor workload during automated measurement sequences.

Part Context

This part belongs to the AD5940/AD5941 family of analog front ends. The AD5940 variant specifically utilizes a 56-ball WLCSP package, whereas the AD5941 uses a 48-lead LFCSP. Both share identical electrical characteristics but differ in physical packaging and pinout configuration.

Replacement Considerations

The AD5941 serves as a package-compatible alternative within the same functional family, offering a 48-lead LFCSP instead of the WLCSP. Verify pin-to-pin compatibility and PCB layout adjustments before substitution.