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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|Number of input channels|
|Number of LEDs|
|Operating temperature range (C)|
|Package size: mm2:W x L (PKG)|
|Approx. price (US$)|
|Optical biosensing||Optical biosensing||Optical biosensing||Optical biosensing||Optical Biosensing||Optical biosensing||Optical biosensing|
|-20 to 70||-20 to 70||-20 to 70||-20 to 70||-40 to 85||-40 to 85||-20 to 70|
|DSBGA | 36||DSBGA | 15||VQFN | 40|
|See datasheet (DSBGA)||See datasheet (DSBGA)||40VQFN: 36 mm2: 6 x 6 (VQFN | 40)|
|2.65 | 1ku||3.25 | 1ku||2.28 | 1ku||2.50 | 1ku||4.10 | 1ku||7.95 | 1ku||2.75 | 1ku|
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