To answer high-precision biological and chemical sensing issues such as vital sign monitoring, Analog Devices launches the AD5940 analog front end, that is an electrochemical & impedance measurement front end. It includes both potentiostat and electrochemical impedance spectroscopy (EIS) functionality on a single chip for sensor measurement in both time and frequencies domains. It also comprises integrated hardware accelerators for advanced sensor diagnostics. This single chip solution enables to measure 2-Lead, 3-Lead and 4-Lead electrochemical sensors with advantages in terms of system accuracy and size flexibility.
With low power consumption and intelligent autonomous control, the front end comprises a combination of leading levels of integration and performance for potentiostat and impedance-based electrochemical sensor managements. Equipped with two potentiostat loops, a low bandwidth loop (with ability to generate AC signals up to 200 Hz) and a high bandwidth loop (generates AC signals up to 200kHz), AD5940 allows to do amperometric, voltametric, or impedance measurements. Moreover, the AD5940 measurement channel features a 16-bit, 800 kSPS, multichannel successive approximation register (SAR) analog-to-digital converter (ADC) with input buffers, a built in anti-alias filter (AAF), and a programmable gain amplifier (PGA).