Multimodal Sensor Front End

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Part Details
Part Models 1
1ku List Price Starting From $7.80
  • Multimodal analog front end
  • Optical channel
    • 4 input channels with multiple operation modes for various sensor measurements
    • 4-channel processing with simultaneous sampling
    • 12 programmable time slots for synchronized sensor measurements
    • Flexible input multiplexing to support single-ended sensor measurements
    • 8 LED drivers, 2 of which can be driven simultaneously
    • Flexible sampling rate from 0.004 Hz to 9 kHz using internal oscillators
    • AC ambient light rejection: 78 dB up to 100 Hz
    • 400 mA total LED peak drive current
    • Individual ambient cancellation DAC at TIA input with 9-bit control up to 300 μA
    • Individual LED DC cancellation DAC at TIA input with 7-bit control up to 190 μA
  • ECG channel
    • <1 μV RMS RTI noise at diagnosis bandwidth
    • High input impedance 20 GΩ
    • Accepts up to ±1.2 V of DC differential input range
    • CMRR: 115 dB
    • Flexible 4 electrode configurations to support various applications
    • Both AC lead off detection and DC lead off detection
    • Support always on, low power, lead on detection
  • BIA channel
    • Low power, high accuracy excitation path
    • Configurable excitation frequency up to 250 kHz
    • Sine wave excitation with a 12-bit DAC
    • High accuracy with large imbalance contact impedance ≤20 kΩ
    • Configurable receive filters with low noise design
    • Complex impedance measurement engine
    • Integrated current-limit resistors
  • EDA channel
    • Support both voltage excitation and current excitation
    • 10 kΩ to100 MΩ measurement range with 1 nS resolution
    • DFT and decimation for high accuracy measurement result
  • SPI communications supported
  • 704-byte FIFO
Additional Details
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The ADPD7000 is a highly integrated analog front end (AFE) designed for measuring various vital signals.

The optical channel is designed as an optical transceiver, stimulating up to eight light emitting diodes (LEDs) and measuring the return signal on up to four separate current inputs. The signal chain 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.

The electrocardiography (ECG) signal acquisition is designed to support low noise, diagnostic level measurement in the presence of a variety of interferers. The ECG signal chain has a number of complementary features supporting ECG measurement, such as driven reference for common-mode rejection and lead off detection to identify a fallen electrode.

The body impedance analysis (BIA) signal chain is designed for body impedance measurement with a configurable excitation path and measurement path. A 12-bit digital-to-analog converter (DAC) is used in the excitation path to generate the sinusoid wave and high precision measurement, with configurable filters used to measure the body response of the stimulus.

The electrodermal activity (EDA) signal chain is designed for electrodermal activity. By multiplexing BIA and ECG peripheral circuits, the ADPD7000 supports high precision AC and DC measurement with 1 nS resolution.

The data output and functional configuration use a serial port interface (SPI) on the ADPD7000. The control circuitry includes flexible LED signaling and synchronous detection, digital filters, digital wave generators, and configurable filters.

The ADPD7000 is available in a 2.795 mm × 2.560 mm, 0.40 mm pitch, 36-ball WLCSP.


  • Wearable health and fitness monitors: heart rate, heart rate variability, saturation level of pulse oxygen, body impedance analysis, hydration analysis, and cuff-less noninvasive blood pressure
  • Clinical patient monitors: small bed-side patient, home portable patient, and small remote patient
  • Industrial monitoring: particle, aerosol, and gas detection
  • Conductivity detection
Part Models 1
1ku List Price Starting From $7.80

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Software & Part Ecosystem

Software & Part Ecosystem

VSM Client Setup

A Windows client solution of VSM products from ADI which can adjust PPG, ECG and BIOZ corresponding parameters, plot signals and optimize signals through some simple algorithms.

ADPD7000 SDK Setup

The ADPD7000 SDK library is a collection of APIs that provide a consistent interface to the Multimodal Sensor Front End Devices.

Evaluation Kit

Evaluation Kits 1

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Evaluating the ADPD7000 Multimodal Sensor Front End



Evaluating the ADPD7000 Multimodal Sensor Front End

Evaluating the ADPD7000 Multimodal Sensor Front End

Features and Benefits

  • Board supports ADPD7000 population
  • 6 separately driven LEDs are included: 3 green LEDs around the center and 3 packaged LEDs, each of which includes 1 infrared LED and 1 red LED
  • 4 channels of photodiode input: two channels with a single PD and two channels with a double PD
  • Works with the VSM Client evaluation software allowing the following:
    • Time domain graphing and logging
    • Selection of supported functions, including PPG, BIA, EDA, and ECG
    • Real-time data display with various combinations of the supported functions

Product Detail

The user guide describes the operation of the EVAL-ADPD7000Z demonstration kit, which is an evaluation module for the ADPD7000.

The ADPD7000 is a fully Integrated analog front end (AFE) for wearable vital signal monitoring (VSM) devices. The key functions of the ADPD7000 include photoplethysmography (PPG), electrocardiogram (ECG), body impedance analysis (BIA), and electrodermal activity (EDA).

This demonstration kit includes both software and hardware. The EVAL-ADPD7000Z can evaluate the AFE feature and verify the system design based on the AFE. According to the requirements of the application, the user can use a cable connection or Bluetooth connection to establish communication between the PC and the EVAL-ADPD7000Z demonstration kit.

The user guide also describes an example configuration of the different functions of the ADPD7000.

For full details on the ADPD7000, see the ADPD7000 data sheet, which must be consulted in conjunction with the user guide when using the EVAL-ADPD7000Z.

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