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.
The device is a complete AFE solution packaged in a single, compact VQFN-40 package (6 mm × 6 mm) and is specified over the operating temperature range of –40°C to 85°C.
|Sample Rate (max) (SPS)|
|# Input Channels|
|Dynamic Range (dB)|
|# of LEDs|
|Max LED Current (Max) (mA)|
|Analog Voltage AVDD (Min) (V)|
|Analog Voltage AVDD (Max) (V)|
|Operating Temperature Range (C)|
|Package Size: mm2:W x L (PKG)|