The AFE4403 is a fully-integrated analog front-end (AFE) ideally suited for pulse oximeter applications. The device consists of a low-noise receiver channel with an integrated 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 AFE4403, 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.
Fully-Integrated AFE for Pulse Oximeter and Heart Rate Monitoring Applications
Integrated Dual LED Driver
Option for a Third LED Support for Optimized SPO2, HRM, or Multi-Wavelength HRM
Up to 110-dB Dynamic Range
22-Bit Output in Twos Complement Format Receive Channel
