Analog Devices Inc. ADPD4100 & ADPD4101 Multimodal Sensor Front Ends

Analog Devices Inc. ADPD4100 and ADPD4101 Multimodal Sensor Front Ends stimulate up to eight LEDs and measure the return signal on up to eight separate current inputs. These devices offer 12 programmable time slots for synchronized sensor measurements. The ADPD4100 and ADPD4101 sensor front ends feature dual-channel processing with simultaneous sampling, flexible input multiplexing, and on-chip digital filtering. The ADPD4100 supports SPI communication and the ADPD4101 supports I2C communication. Typical applications include wearable health and fitness monitors, industrial monitoring, and home patient monitoring.


  • Multimodal analog front end
  • 8 input channels with multiple operation modes for various sensor measurements
  • 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 0.004Hz to 9kHz using internal oscillators
  • On-chip digital filtering
  • SNR of transmit and receive signal chain: 100dB
  • AC ambient light rejection: 60dB up to 1kHz
  • 400mA total LED peak drive current
  • Total system power dissipation
    • 30µW (combined LED and AFE power)
    • Continuous PPG measurement at 75dB SNR, 25Hz ODR, 100nA/mA CTR
  • Interface
    • ADPD4100: SPI
    • ADPD4101: I2
  • 512-byte FIFO size
  • Package options
    • WLCSP-33
    • WLCSP-35


  • Wearable health and fitness monitors:
    • Heart Rate Monitors (HRMs)
    • Heart Rate Variability (HRV)
    • Stress
    • Blood pressure estimation
    • Spot Oxygen saturation (SpO2)
    • Hydration
    • Body composition
  • Industrial monitoring:
    • CO, CO2, smoke, and aerosol detection
  • Home patient monitoring
  • Different sensor measurements:
    • Photoplethysmography (PPG)
    • Electrocardiography (ECG)
    • Electrodermal activity (EDA)
    • Impedance
    • Capacitance
    • Temperature


  • 0.004Hz to 9kHz flexible sampling rate using internal oscillators
  • 100dB SNR of transmit and receive signal chain
  • 60dB up to 1kHz AC ambient light rejection
  • 400mA total LED peak drive current
  • 512-byte FIFO size
  • 30µW total system power dissipation (combined LED and AFE power)

Additional Resources

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This article covers the fundamentals of SpO2 measurement and demonstrates how a new generation of optical analog front ends (AFEs) can help create a better oximeter.

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In the vast portfolio of Analog Devices’ products dedicated to signal processing, designers of vital sign monitoring systems will find a whole range of solutions to the design challenges they face.

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Functional Block Diagram

Block Diagram - Analog Devices Inc. ADPD4100 & ADPD4101 Multimodal Sensor Front Ends

Performance Graph

Performance Graph - Analog Devices Inc. ADPD4100 & ADPD4101 Multimodal Sensor Front Ends
Published: 2020-08-03 | Updated: 2023-01-04