AFE4405

Product Folder Order Now Technical Documents Tools & Software Support & Community AFE4405 SBAS768C – APRIL 2016 – REVISED JULY 2019 AFE4405 Ultra-Small, Integrated AFE with FIFO for Wearable, Optical Heart-Rate Monitoring and Bio-Sensing 1 Features 1 Transmitter: – Supports Common Anode LED Configuration – Dynamic Range: 100 dB – 8-Bit Programmable LED Current to 50 mA (Extendable to 100 mA) – Programmable LED On-Time – Simultaneous Support of 3 LEDs for Optimized SpO2, HRM, or Multi-Wavelength HRM Receiver: – Supports 2 Time-Multiplexed Photodiode Inputs – 24-Bit Representation of the Current Input from the Photodiode in Twos Complement Format – Individual DC Offset Subtraction DAC (±15.75-µA Range) at TIA Input for Each LED, Ambient – Digital Ambient Subtraction at ADC Output – Transimpedance Gain: 10 kΩ to 2 MΩ – Dynamic Range: 100 dB – Dynamic Power-Saving Mode to Reduce Receiver Current to 200 µA Pulse Frequency: 5 SPS to 1000 SPS Flexible Pulse Sequencing and Timing Control Flexible Clock Options: – External Clocking: 4-MHz to 60-MHz Input Clock – Internal Clocking: 4-MHz Oscillator FIFO with 240 Sample Depth: – Programmable Partitioning Across Phases I2C, SPI Interfaces: Selectable by Pin Operating Temperature Range: –20°C to +70°C 2.6-mm × 2.1-mm DSBGA, 0.4-mm Pitch Supplies: Rx: 2 V to 3.6 V, Tx: 3 V to 5.25 V, IO: 1.8 V to 3.6 V 2 Applications Optical Heart-Rate Monitoring (HRM) for Wearables, Hearables Heart-Rate Variability (HRV) Pu...