Part Number : AFE4490
Function : Integrated Analog Front-End for Pulse Oximeters
Package : VQFN-40 (6 mm × 6 mm) Type
Maker : Texas Instruments
The AFE4490 is a fully-integrated analog front-end (AFE) that is ideally suited for pulse-oximeter applications. The device consists of a low-noise receiver channel with a 22-bit analog-to-digital converter (ADC), an LED transmit section, and diagnostics for sensor and LED fault detection.
The device is a very configurable timing controller. This flexibility enables the user to have complete control of the device timing characteristics. To ease clocking requirements and provide a low-jitter clock to the device, an oscillator is also integrated that functions from an external crystal.
The device communicates to an external microcontroller or host processor using an SPI interface.