The AFE4420 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 up to four switching light-emitting diodes (LEDs) and up to four photodiodes. Up to 16 signal phases can be defined and the signal can be acquired from each phase in a synchronized manner and stored in a 128-sample First in, First out (FIFO) block. The FIFO can be read out using either an I2C or a SPI interface. The AFE also has a fully- integrated LED driver with an 8-bit current control. 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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|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|
|-40 to 85||-20 to 70||-20 to 70||-20 to 70|
|DSBGA | 15|
|See datasheet (DSBGA)|
|4.10 | 1ku||2.28 | 1ku||2.50 | 1ku||2.65 | 1ku|
|Order now||Order now||Order now||Order now|