Overview

Features and Benefits

  • Multimodal analog front end
  • 4 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
  • 4 LED drivers, which can be driven simultaneously
  • Flexible sampling rate from 0.004 Hz to 9 kHz using internal oscillators
  • On-chip digital filtering
  • SNR: 105 dB (100 kΩ TIA gain, 100 Hz ODR, 80 pulses, CPD = 70 pF, 0.5 Hz to 10 Hz bandwidth)
  • AC ambient light rejection: 60 dB up to 1 kHz
  • 400 mA total LED peak drive current
  • Total system power dissipation: 30 μW (combined LED and AFE power), continuous PPG measurement at 75 dB SNR, 25 Hz ODR, 100 nA/mA CTR
  • SPI communications supported
  • 512-byte FIFO size

Product Details

The ADPD4200 operates as a complete multimodal sensor front end, stimulating up to four light emitting diodes (LEDs) and measuring the return signal on up to four separate current inputs. Twelve time slots are available, enabling 12 separate measurements per sampling period.

The data output and functional configuration utilize a serial port interface (SPI) on the ADPD4200. The control circuitry includes flexible LED signaling and synchronous detection. The device uses a 1.8 V analog core and 1.8 V or 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 ADPD4200 to be a sensor hub for synchronous measurements of photodiodes, biopotential electrodes, resistance, capacitance, and temperature sensors.

The ADPD4200 is available in a 2.619 mm × 1.804 mm, 0.40 mm pitch, 24-ball WLCSP.

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APPLICATIONS

  • Wearable health and fitness monitors: heart rate monitors (HRMs), heart rate variability (HRV), stress, blood pressure estimation, SpO2, hydration, and body composition
  • Industrial monitoring: CO, CO2, smoke, and aerosol detection
  • Home patient monitoring

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.