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.The device is a complete AFE solution packaged in
a single, compact DSBGA-36 (3.07 mm × 3.07 mm × 0.5 mm) and is specified over the
operating temperature range of –20°C to 70°C.
