AFE4403 Datasheet | Texas Instruments

Features - 1 Fully-Integrated AFE for Pulse Oximeter and Heart Rate Monitoring Applications: - Transmit: - Integrated Dual LED Driver (H-Bridge or mon Anode) - Option for a Third LED Support for Optimized SPO2, HRM, or Multi-Wavelength HRM - Up to 110-d B Dynamic Range - LED Current: - Programmable to 100 m A with 8-Bit Current Resolution - 30 µA + Average LED Current - Programmable LED On-Time - Independent LED2 and LED1 Current Reference - Receive Channel with High Dynamic Range: - 22-Bit Output in Twos plement Format - Up to 105-d B Dynamic Range - Low Power: < 650 µA - Dynamic Power-Down Mode to Reduce Current to 300 µA - Adaptable to a Very Wide Range of Signal Amplitudes: - Total Programmable Gain: 10 kΩ to 4 MΩ - Integrated Digital Ambient Estimation and Subtraction - Flexible Clocking by External Clock or Crystal: - Pulse Frequency: 62.5 SPS to 2000 SPS - Flexible Pulse sequencing and Timing Control - Input Clock Range: 4 MHz (Min) to 60 MHz (Max) - Integrated Fault Diagnostics: - Photodiode and LED Open and Short Detection - Supplies: - Rx = 2.0 V to 3.6 V - Tx = 3.0 V to 5.25 V - Package: pact DSBGA-36 (3.07 mm × 3.07 mm × 0.5 mm) - Specified Temperature Range: - 20°C to 70°C 2 Applications - Medical Pulse Oximeter Applications - Optical HRM - Industrial Photometry Applications 3 Description 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 plete 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 municates to an external microcontroller or host processor using an SPI™...