The AFE4410 is an analog front-end for optical biosensing applications, such as heart-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 the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code is stored in a 128-sample first in, first-out block (FIFO) with programmable depth. The FIFO can be read out using either an I2C interface or a serial peripheral interface (SPI). The AFE also has a fully integrated LED driver with 8-bit current control. The device has high dynamic range transmit-and-receive circuitry offering a dynamic range of up to 100 dB that enables accurate heart-rate sensing. The AFE achieves extremely low current levels by operating an ultralow power (ULP) mode set by using the ENABLE_ULP register bit.
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|# Input Channels|
|Sample Rate (max) (SPS)|
|Number of LEDs|
|Operating Temperature Range (C)|
|Package Size: mm2:W x L (PKG)|
| SPI |
|SPI||I2C|| I2C |
|-20 to 70||-20 to 70||-20 to 70||-20 to 70||-40 to 85|
|See datasheet (DSBGA)||See datasheet (DSBGA)||40VQFN: 36 mm2: 6 x 6(VQFN)|
|Optical biosensing||Optical biosensing||Optical biosensing||Optical biosensing||Optical biosensing|