The AFE44I30 evaluation module (EVM) is a platform for expediting and evaluating system-development activities related to the AFE44I30 product. AFE44I30 is an analog front end (AFE) for optical biosensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2).
AFE44I30 supports six switching light-emitting diodes (LEDs) and four photodiodes. Up to 24 signal phases can be defined and the signal can be acquired from each phase in a synchronized manner. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code can be stored in a 128-sample FIFO with programmable depth. FIFO depth can be partitioned to accommodate the phases that need to be stored. The FIFO can be read out using a serial peripheral interface (SPI).
The AFE also has a fully-integrated LED driver with an 8-bit current control. AFE44I30 can be clocked by an external clock or by internal oscillator. The device communicates to an external host processor using I2C interface. The device has a high dynamic range transmit-and-receive circuitry that helps with the sensing of very small signal levels.
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