AD8233 Datasheet | Analog Devices

Data Sheet 50 µA, 2 mm × 1.7 mm WLCSP, Low Noise, Heart Rate Monitor for Wearable Products Features Fully integrated, single-lead ECG front end Low quiescent supply current: 50 µA (typical) Leads on/off detection while in shutdown (<1 µA) mon-mode rejection ratio: 80 d B (dc to 60 Hz) 2-electrode and 3-electrode configurations High signal gain (G = 100) with dc blocking capabilities 2-pole adjustable high-pass filter Accepts up to ±300 m V of half cell potential Fast restore feature improves filter settling Unmitted op amp 3-pole adjustable low-pass filter with adjustable gain Integrated RLD amplifier with shutdown Single-supply operation: 1.7 V to 3.5 V Integrated reference buffer generates virtual ground Rail-to-rail output Internal RFI filter 8 k V HBM ESD rating Shutdown pin 2 mm × 1.7 mm WLCSP package APPLICATIONS Fitness and activity heart rate monitors Portable ECG Wearable and remote health monitors Gaming peripherals Biopotential signal acquisition, such as EMG or EEG GENERAL DESCRIPTION The AD8233 is an integrated signal conditioning block for electrocardiogram (ECG) and other biopotential measurement applications. It is designed to extract, amplify, and filter small biopotential signals in the presence of noisy conditions, such as those created by motion or remote electrode placement. This design allows an ultralow power analog-to-digital converter (ADC) or an embedded microcontroller to easily acquire the output signal. The AD8233 implements a two-pole, high-pass filter for eliminating motion artifacts and the electrode half cell potential. This filter is tightly coupled with the instrumentation amplifier architecture to allow both large gain and high-pass filtering in a single stage, thereby saving space and cost. An unmitted operational amplifier enables the AD8233 to create a three-pole, low-pass filter to remove additional noise. The user can select the frequency cutoff of all filters to suit different types of applications. FUNCTIONA...