AFE4410 - Ultra-Small Integrated AFE With FIFO for Wearable Optical Heart-Rate Monitoring and Biosensing

Texas Instruments

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The AFE4410 is an analog front-end for optical biosensing applications, such asheart-rate monitoring (HRM). The device supports up to four switching light-emitting diodes (LEDs)and up to three photodiodes (PDs). The current from the photodiode is converted into voltage by thetransimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADCcode is stored in a 128-sample first in, first-out block (FIFO) with programmable depth. The FIFOcan be read out using either an I2C interface or a serial peripheralinterface (SPI). The AFE also has a fully integrated LED driver with 8-bit current control. Thedevice has high dynamic range transmit-and-receive circuitry offering a dynamic range of up to 100dB that enables accurate heart-rate sensing. The AFE achieves extremely low current levels byoperating an ultralow power (ULP) mode set by using the ENABLEULP register bit.

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