AD5941BCPZ

Overview

The AD5941BCPZ 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 for frequencies up to 200 kHz. The device includes a potentiostat amplifier, transimpedance amplifiers, programmable gain amplifiers, and internal voltage references of 1.82 V and 2.5 V. Operating on a 2.8 V to 3.6 V supply, it supports SPI communication and includes a programmable sequencer with 6 kB SRAM for autonomous operation in a 48-lead LFCSP package.

Feature Summary

• 16-bit SAR ADC with 800 kSPS sampling rate and integrated antialias filter
• Dual excitation loops: low-power DAC/potentiostat (DC–200 Hz) and high-speed DAC (up to 200 kHz)
• Integrated low-noise potentiostat amplifier and dual transimpedance amplifiers (low-power and high-speed)
• Programmable AFE sequencer with 6 kB SRAM for autonomous measurement control

Applications

• Electrochemical measurements including amperometry and voltammetry
• Bioimpedance analysis for skin and body impedance monitoring
• Continuous glucose monitoring systems
• Battery impedance testing
• Electrochemical toxic gas sensing

Procurement Notes

Verify the specific suffix 'BCPZ' against the manufacturer's ordering guide to confirm the package type (LFCSP-48), temperature range (-40°C to +85°C), and reel/tray packaging configuration. Ensure compatibility with 1.82 V I/O levels if interfacing with lower voltage logic controllers.

Selection Notes

Select the AD5941BCPZ over the AD5940 when a 48-lead LFCSP package is required instead of the 56-ball WLCSP. Consider the device's 6.5 µA hibernate current consumption for battery-operated designs. Verify that the 2.8 V to 3.6 V supply range aligns with the system power architecture.

Part Context

The AD5941 is part of the AD5940/AD5941 family of analog front ends from Analog Devices. While functionally identical to the AD5940 regarding electrical performance and peripheral integration, the AD5941 utilizes a 7 mm × 7 mm, 48-lead Lead Frame Chip Scale Package (LFCSP). This variant is specified for industrial temperatures ranging from -40°C to +85°C.

Replacement Considerations

The AD5940 serves as the primary functional equivalent, differing only in package format (WLCSP vs. LFCSP). The AD5941W offers an extended temperature range (-40°C to +105°C) within the same LFCSP footprint.