AD5940BCBZ-RL7

Overview

The AD5940BCBZ-RL7 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 two excitation loops: a low-power loop for DC to 200 Hz signals and a high-speed loop generating frequencies up to 200 kHz. The device includes dual output voltage DACs, a potentiostat amplifier, and programmable TIAs. Operating on 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, 800 kSPS SAR ADC with built-in antialias filter and programmable gain amplifier
• Dual excitation loops: Low-power DAC/Potentiostat for DC-200 Hz and High-Speed DAC for up to 200 kHz
• Integrated complex impedance measurement engine using DFT
• Programmable AFE sequencer with 6 kB SRAM for autonomous operation

Applications

• Electrochemical gas sensing
• Bioimpedance analysis (skin and body)
• Continuous glucose monitoring
• Potentiostat/amperometric/voltammetry measurements

Procurement Notes

Verify the specific suffix RL7 against the manufacturer's ordering guide to confirm reel packaging specifications. Ensure compatibility with the host microcontroller's SPI interface timing requirements. Confirm that the 56-ball WLCSP footprint matches the PCB layout design constraints.

Selection Notes

Select this component for applications requiring high-precision current and impedance measurements in portable devices. Compare the 56-ball WLCSP package against the 48-lead LFCSP option of the AD5941 if pin count or board space differs. Verify that the 2.8 V to 3.6 V supply range aligns with the system power architecture.

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 functional capabilities but differ in physical form factor and pin availability.

Replacement Considerations

The AD5941 offers equivalent functionality in a 48-lead LFCSP package. Verify pinout compatibility and mechanical dimensions before substitution.