The AFE4400 is a fully-integrated analog front-end (AFE) ideally suited for pulse oximeter applications. (H-Bridge, Push, or Pull) The device consists of a low-noise receiver channel – Dynamic Range: 95 dB with an integrated analog-to-digital converter (ADC), – LED Current: an LED transmit section, and diagnostics for sensor – Programmable to 50 mA with 8-Bit Current and LED fault detection. The device is a very Resolution configurable timing controller. This flexibility enables the user to have complete control of the device timing – Low Power: characteristics. To ease clocking requirements and – 100 μA+ Average LED Current provide a low-jitter clock to the AFE4400, an oscillator – Programmable LED On-Time is also integrated that functions an external crystal. The device communicates to an external – Independent LED2 and LED1 Current microcontroller or host processor using an SPI™ Reference interface.

afe4400.pdf

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