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ADPD4000 Datasheet(PDF) 1 Page - Analog Devices |
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ADPD4000 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 82 page  Multimodal Sensor Front End Data Sheet ADPD4000/ADPD4001 Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2019 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Multimodal analog front end 8 input channels with multiple operation modes to accommodate the following measurements: PPG, ECG, EDA, impedance, and temperature Dual channel processing with simultaneous sampling 12 programmable time slots for synchronized sensor measurements Flexible input multiplexing to support differential and single-ended sensor measurements 8 LED drivers, 4 of which can be driven simultaneously Flexible sampling rate from 0.004 Hz to 9 kHz using internal oscillators On-chip digital filtering SNR of transmit and receive signal chain: 90 dB Ambient light rejection: 60 dB up to 1 kHz 400 mA total LED drive current Total system power dissipation: 50 µW (combined LED and AFE power), continuous PPG measurement at 75 dB SNR, 25 Hz ODR, 100 nA/mA CTR SPI and I2C communications supported 256-byte FIFO APPLICATIONS Wearable health and fitness monitors: heart rate monitors (HRMs), heart rate variability (HRV), stress, blood pressure estimation, SpO2, hydration, body composition Industrial monitoring: CO, CO2, smoke, and aerosol detection Home patient monitoring GENERAL DESCRIPTION The ADPD4000/ADPD4001 operate as a complete multimodal sensor front end, stimulating up to eight LEDs and measuring the return signal on up to eight separate current inputs. Twelve time slots are available, enabling 12 separate measurements per sampling period. The data output and functional configuration utilize an I2C interface on the ADPD4001 or a serial port interface (SPI) on the ADPD4000. The control circuitry includes flexible LED signaling and synchronous detection. The devices use a 1.8 V analog core and 1.8 V/3.3 V compatible digital input/output (I/O). The analog front end (AFE) rejects signal offsets and corruption from asynchronous modulated interference, typically from ambient light, eliminating the need for optical filters or externally controlled dc cancellation circuitry. Multiple operating modes are provided, enabling the ADPD4000/ ADPD4001 to be a sensor hub for synchronous measurements of photodiodes, biopotential electrodes, resistance, capacitance, and temperature sensors. The ADPD4000/ADPD4001 are available in a 3.11 mm × 2.14 mm, 0.4 mm pitch, 33-ball WLCSP and 35-ball WLCSP. FUNCTIONAL BLOCK DIAGRAM LED4B LED3B LED2B LED1B LED4A LED3A LED2A LED1A LED DRIVERS LED LEVEL AND MUX CONTROL LGND IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 CH 1 SIGNAL CONDITIONING CH 2 SIGNAL CONDITIONING TIA_VREF ADC VC1 VC2 VOLTAGE REFERENCES VREF VC1 VC2 TIA_VREF VICM CS SCLK MOSI MISO SCL SDA GPIO0 GPIO1 GPIO2 GPIO3 AVDD DVDD1 DVDD2 IOVDD AGND DGND IOGND VREF INTEGRATOR TIMING INTEGRATOR TIMING HIGH FREQUENCY AND LOW FREQUENCY OSCILLATORS ADPD4000/ADPD4001 NOTES 1. CS, SCLK, MOSI, AND MISO PINS ARE ON THE ADPD4000. 2. SCL AND SDA PINS ARE ON THE ADPD4001. 3. TIA_VREF IS THE INTERNAL VOLTAGE REFERENCE SIGNAL FOR THE TRANSIMPEDANCE AMPLIFIER. DIGITAL PROCESSING, INTERFACE AND TIMING CONTROL, FIFO, PROGRAM AND DATA REGISTERS, COMMUNICATIONS Figure 1. |
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