AFE4490

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design AFE4490 SBAS602H – DECEMBER 2012 – REVISED OCTOBER 2014 AFE4490 Integrated Analog Front-End for Pulse Oximeters 1 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) – 110-dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current) – LED Current: – Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA, Each with 8-Bit Current Resolution – Low Power: – 100 µA + Average LED Current – LED On-Time Programmability from (50 µs + Settle Time) to 4 ms – Independent LED2, LED1 Current Reference Receive Channel with High Dynamic Range: – Input-Referred Noise: 50 pARMS (at 5-µA PD Current) – 13.5 Noise-Free Bits (at 5-µA PD Current) – Analog Ambient Cancellation Scheme with Selectable 1-µA to 10-µA Ambient Current – Low Power: < 2.3 mW at 3.0-V Supply – Rx Sample Time: 50 µs to 4 ms – I-V Amplifier with Seven Separate LED2 and LED1 Programmable Feedback R and C Settings – Integrated Digital Ambient Estimation and Subtraction Integrated Fault Diagnostics: – Photodiode and LED Open and Short Detection – Cable On or Off Detection Supplies: – Rx = 2.0 V to 3.6 V – Tx = 3.0 V or 5.25 V Package: Compact VQFN-40 (6 mm × 6 mm) Specified Temperature Range: –40°C to 85°C 2 Applications Medical Pulse Oximeter Application...