The AFE4404YZPT is an Analog Front-End for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports three switching light-emitting diodes (LEDs) and a single photodiode. 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 read out using an I²C interface. The AFE also has a fully integrated LED driver with a 6-bit current control. The device has a high dynamic range transmit and receive circuitry that helps with the sensing of very small signal levels.
Transmitter - supports common anode LED configuration
Transmitter - 100dB dynamic range
Transmitter - 6-bit programmable LED current to 50mA (Extendable to 100 mA)
Transmitter - Programmable LED on-time
Transmitter - Simultaneous Support of 3 LEDs for Optimized SpO2, HRM or multi-wavelength HRM
24-bit Representation of the current input from a photodiode in twos complement format
Receiver - Individual DC offset subtraction DAC at TIA input for each LED and ambient phase
Receiver - Digital ambient subtraction at ADC output
Receiver - 10 kR to 2 MR Programmable transimpedance gain
Receiver - 100dB Dynamic range
Receiver - Dynamic power-saving mode to reduce current to less than 200µA
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