Data Sheet ADPD4200 Multimodal Sensor Front End FEATURES GENERAL DESCRIPTION Multimodal analog front end The ADPD4200 operates as a complete multimodal sensor front end, stimulating up to four light emitting diodes (LEDs) and measur- 4 input channels with multiple operation modes to accommodate ing the return signal on up to four separate current inputs. Twelve the following measurements: PPG, ECG, EDA, impedance, and time slots are available, enabling 12 separate measurements per temperature sampling period. Dual-channel processing with simultaneous sampling 12 programmable time slots for synchronized sensor measure- The data output and functional configuration utilize a serial port ments interface (SPI) on the ADPD4200. The control circuitry includes flexible LED signaling and synchronous detection. The device uses Flexible input multiplexing to support differential and single- a 1.8 V analog core and 1.8 V or 3.3 V compatible digital input/out- ended sensor measurements put (I/O). 4 LED drivers, which can be driven simultaneously Flexible sampling rate from 0.004 Hz to 9 kHz using internal The analog front end (AFE) rejects signal offsets and corruption oscillators from asynchronous modulated interference, typically from ambient On-chip digital filtering light, eliminating the need for optical filters or externally controlled dc cancellation circuitry. Multiple operating modes are provided, SNR: 105 dB (100 k TIA gain, 100 Hz ODR, 80 pulses, C = PD enabling the ADPD4200 to be a sensor hub for synchronous 70 pF, 0.5 Hz to 10 Hz bandwidth) measurements of photodiodes, biopotential electrodes, resistance, AC ambient light rejection: 60 dB up to 1 kHz capacitance, and temperature sensors. 400 mA total LED peak drive current Total system power dissipation: 30 W (combined LED and AFE The ADPD4200 is available in a 2.619 mm 1.804 mm, 0.40 mm power), continuous PPG measurement at 75 dB SNR, 25 Hz pitch, 24-ball WLCSP. ODR, 100 nA/mA CTR Analog Devices is in the process of updating documentation to SPI communications supported provide terminology and language that is culturally appropriate. This 512-byte FIFO size is a process with a wide scope and will be phased in as quickly as possible. Thank you for your patience. APPLICATIONS Wearable health and fitness monitors: heart rate monitors (HRMs), heart rate variability (HRV), stress, blood pressure esti- mation, SpO , hydration, and body composition 2 Industrial monitoring: CO, CO , smoke, and aerosol detection 2 Home patient monitoring Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliableas i. However, no responsibility is assumed by Analog DOCUMENT FEEDBACK Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and TECHNICAL SUPPORT registered trademarks are the property of their respective owners.Data Sheet ADPD4200 TABLE OF CONTENTS Features................................................................ 1 Execution Modes..............................................22 Applications........................................................... 1 Host Interface...................................................22 General Description...............................................1 Applications Information...................................... 25 Functional Block Diagram......................................3 Operating Mode Overview................................25 Specifications........................................................ 4 Single Integration Mode................................... 25 Temperature and Power Specifications..............4 Multiple Integration Mode.................................34 Performance Specifications................................5 Digital Integration Mode................................... 36 Digital Specifications.......................................... 7 TIA ADC Mode................................................. 38 Timing Specifications......................................... 8 ECG Measurement with the ADPD4200.......... 39 Absolute Maximum Ratings...................................9 Register Map....................................................... 43 Thermal Resistance........................................... 9 Register Details .................................................. 69 Recommended Soldering Profile........................9 Global Configuration Registers........................ 69 Electrostatic Discharge (ESD) Ratings...............9 Interrupt Status and Control Registers.............71 ESD Caution.......................................................9 Threshold Setup and Control Registers........... 77 Pin Configuration and Function Descriptions...... 10 Clock and Timestamp Setup and Control Typical Performance Characteristics................... 11 Registers........................................................ 79 Theory of Operation.............................................13 System Registers............................................. 79 Introduction.......................................................13 Input and Output Setup and Control Analog Signal Path...........................................13 Registers........................................................ 80 LED Drivers......................................................15 Time Slot Configuration Registers....................83 Determining C ........................................... 15 AFE Timing Setup Registers............................ 87 VLED Datapath, Decimation, Subsampling, and LED Control and Timing Registers...................89 FIFO............................................................... 16 ADC Offset Registers.......................................90 Clocking............................................................19 Output Data Registers......................................90 Time Stamp Operation..................................... 19 Outline Dimensions............................................. 93 Low Frequency Oscillator Calibration...............20 Ordering Guide.................................................93 High Frequency Oscillator Calibration..............20 Evaluation Boards............................................ 93 Time Slot Operation......................................... 21 REVISION HISTORY 3/2022Revision 0: Initial Version analog.com Rev. 0 2 of 93