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AFE4490 Datasheet(PDF) 1 Page - Texas Instruments |
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AFE4490 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 69 page  Timing Controller Diagnostic LED Driver LED Current Control DAC Tx AFE LED Photodiode PD Open or Short Cable Off LED Open or Short RX Supply (2.2 V to 3.6 V) AFE4400 SPI Interface RED Amb (RED) IR Amb (IR) AFE SPI Tx Driver Supply OSC 32 kHz TIA û ADC 5-V Supply AFE4400 www.ti.com SBAS601D – DECEMBER 2012 – REVISED MAY 2013 Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters Check for Samples: AFE4400 1 FEATURES APPLICATIONS 23 • Fully-Integrated Analog Front-End for • Low-Cost Medical Pulse Oximeter Applications Pulse Oximeter Applications: • Optical HRM – Flexible Pulse Sequencing and • Industrial Photometry Applications Timing Control • Transmit: DESCRIPTION The AFE4400 is a fully-integrated analog front-end – Integrated LED Driver (AFE) that is ideally suited for pulse oximeter (H-Bridge or Push/Pull) applications. The device consists of a low-noise – 95-dB Dynamic Range receiver channel with an integrated analog-to-digital – LED Current: converter (ADC), an LED transmit section, and diagnostics for sensor and LED fault detection. The – Programmable to 50 mA with 8-Bit AFE4400 is a very configurable timing controller. This Current Resolution flexibility enables the user to have complete control of – Low Power: the device timing characteristics. To ease clocking – 100 µA + Average LED Current requirements and provide a low-jitter clock to the AFE4400, an oscillator is also integrated that – Programmable LED On-Time functions from an external crystal. The device – Independent LED2 and LED1 Current communicates to an external microcontroller or host Reference processor using an SPI™ interface. • Receive Channel with High Dynamic Range: The AFE4400 is a complete AFE solution packaged – 13 Noise-Free Bits (0.1 Hz to 5 Hz) in a single, compact QFN-40 package (6 mm × – Low Power: < 670 µA at 3.3-V Supply 6 mm) and is specified over the operating temperature range of 0°C to +70°C. – Flexible Receive Sample Time – Flexible Transimpedance Amplifier with Programmable LED Settings – Integrated Digital Ambient Estimation and Subtraction • Integrated Fault Diagnostics: – Photodiode and LED Open and Short Detection – Cable On/Off Detection • Supplies: – Rx = 2.0 V to 3.6 V – Tx = 3.0 V to 3.6 V • Package: Compact QFN-40 (6 mm × 6 mm) • Specified Temperature Range: 0°C to +70°C 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 SPI is a trademark of Motorola. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2012–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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