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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|Part number||Order||Number of input channels||Resolution (Bits)||Interface||Number of LEDs||Features||Operating temperature range (C)||Package Group||Package size: mm2:W x L (PKG)||Approx. price (US$)|
||4||24||I2C||4||Optical Biosensing||-40 to 85||4.10 | 1ku|
||1||24||I2C||3||Optical biosensing||-20 to 70||DSBGA | 15||See datasheet (DSBGA)||2.28 | 1ku|
|AFE4405||Samples not available||2||24||
|3||Optical biosensing||-20 to 70||2.50 | 1ku|
|AFE4410||Samples not available||3||24||
|4||Optical biosensing||-20 to 70||2.65 | 1ku|