AFE4400 Datasheet | Texas Instruments

Features - 1 Fully-Integrated Analog Front-End for Pulse Oximeter Applications: - Flexible Pulse Sequencing and Timing Control - Transmit: - Integrated LED Driver (H-Bridge, Push, or Pull) - Dynamic Range: 95 d B - LED Current: - Programmable to 50 m A with 8-Bit Current Resolution - Low Power: - 100 µA + Average LED Current - Programmable LED On-Time - Independent LED2 and LED1 Current Reference - Receive Channel with High Dynamic Range: - 13 Noise-Free Bits - Low Power: < 670 µA at 3.3-V Supply - Integrated Digital Ambient Estimation and Subtraction - Flexible Receive Sample Time - Flexible Transimpedance Amplifier with Programmable LED Settings - Integrated Fault Diagnostics: - Photodiode and LED Open and Short Detection - Cable On and Off Detection - Supplies: - Rx = 2.0 V to 3.6 V - Tx = 3.0 V to 5.25 V - Package: pact VQFN-40 (6 mm × 6 mm) - Specified Temperature Range: 0°C to 70°C 2 Applications - Low-Cost Medical Pulse Oximeter Applications - Optical HRM - Industrial Photometry Applications 3 Description The AFE4400 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 plete control of the device timing characteristics. To ease clocking requirements and provide a low-jitter clock to the AFE4400, an oscillator is also integrated that functions from an external crystal. The device municates to an external microcontroller or host processor using an SPI™ interface. The device is a plete AFE solution packaged in a single, pact VQFN-40 package (6 mm × 6 mm) and is specified over the operating temperature range of 0°C to 70°C. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) VQFN (40) 6.00 mm × 6.00 mm (1) For all available...