Analog DevicesADPD4000BCBZR7Sensor- und Detektorschnittstelle

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.

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

Features and Benefits

•  • 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

Block Diagrams and Tables

Related Evaluation Board

EVAL-ADPD4000Z-PPG

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