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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 / 85 page  Rf Cf Rf Cf Buffer I-V Amplifier (TIA) Offset Cancellation DAC I 2C Interface INP INM LED Driver ILED TX_SUP TX3 TX2 TX1 LDO RX_SUP I2C_CLK I2C_DAT RESETZ ADC_RDY IO_SUP CLK Timing Engine IO Buffer GND TX_SUP Noise- Reduction Filter Internal, External Clock ADC Copyright © 2016, Texas Instruments Incorporated Product Folder Sample & Buy Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. AFE4404 SBAS689D – JUNE 2015 – REVISED DECEMBER 2016 AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing 1 1 Features 1 • Transmitter: – Supports Common Anode LED Configuration – Dynamic Range: 100 dB – 6-Bit Programmable LED Current to 50 mA (Extendable to 100 mA) – Programmable LED On-Time – Simultaneous Support of 3 LEDs for Optimized SpO2, HRM, or Multi-Wavelength HRM • Receiver: – 24-Bit Representation of the Current Input from a Photodiode in Twos Complement Format – Individual DC Offset Subtraction DAC at TIA Input for Each LED and Ambient Phase – Digital Ambient Subtraction at ADC Output – Programmable Transimpedance Gain: 10 kΩ to 2 MΩ – Dynamic Range: 100 dB – Average Current Less Than 200 μA for PPG Signal Acquisition • Pulse Frequency: 10 SPS to 1000 SPS • Flexible Pulse Sequencing and Timing Control • Flexible Clock Options: – External Clocking: 4-MHz to 60-MHz Input Clock – Internal Clocking: 4-MHz Oscillator • I2C Interface • Operating Temperature Range: –20°C to 70°C • 2.6-mm × 1.6-mm DSBGA Package, 0.5-mm Pitch • Supplies: Rx: 2 V to 3.6 V, Tx: 3 V to 5.25 V, IO: 1.8 V to 3.6 V 2 Applications • Optical Heart-Rate Monitoring (HRM) • Heart-Rate Variability (HRV) • Pulse Oximetry (SpO2 Measurement) • VO2 Max • Calorie Expenditure 3 Description The AFE4404 is an analog front-end (AFE) for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports three switching light-emitting diodes (LEDs) and a single photodiode. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code can be read out using an I2C interface. The AFE also has a fully- integrated LED driver with a 6-bit current control. The device has a high dynamic range transmit and receive circuitry that helps with the sensing of very small signal levels. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) AFE4404 DSBGA (15) 2.60 mm × 1.60 mm(2) (1) For all available packages, see the orderable addendum at the end of the datasheet. (2) Refers to dimensions D × E in Figure 99. Simplified Block Diagram |
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Descripción similar - AFE4490 |
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