ADPD4200: Multimodal Sensor Front End Data Sheet (Rev. A)4/11/20221 M
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
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.
Analog Devices is in the process of updating documentation to provide terminology and language that is culturally appropriate. This is a process with a wide scope and will be phased in as quickly as possible. Thank you for your patience.
- 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 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.
Evaluation Kits (1)
The EVAL-ADPD4200Z-PPG evaluation board provides users with a simple means of evaluating the ADPD4200 photometric front end. The EVAL-ADPD4200Z-PPG evaluation board implements a simple, discrete optical design for vital signs monitoring applications, specifically wrist-based photoplethysmography (PPG).
The EVAL-ADPD4200Z-PPG has three green light emitting diodes (LEDs), one infrared (IR), and one red LED, which all separately driven. A single 7 mm2 photodiode is populated on the board. The photodiode has no optical filter coating. However, a pin for pin alternative device with an IR block filter is available.
The full evaluation system includes the Wavetool Evaluation Software graphical user interface (GUI) that provides users with low level register access and high level system configurability. Raw data streamed to this tool can be displayed in real time with limited latency. Views are provided for both frequency and time domain analysis.
A user datagram protocol (UDP) transfer capability from the Wavetool Evaluation Software (available for download on the EVAL-ADPD4200Z-PPG product page) allows data stream connections and register configurability to external analysis programs, such as LabVIEW® or MATLAB®, in real time.
The EVAL-ADPD4200Z-PPG board is powered by the EVAL-ADPDUCZ microcontroller board (obtained from the EVAL-ADPD4200Z-PPG product page). In addition to the power requirements, serial port interface (SPI) (default) data streams are received from the ADPD4200 by the microcontroller.
A ribbon cable connects these two boards. The microcontroller repackages the data, sending it to a virtual serial port over the USB to the PC, displayed on the Wavetool Evaluation Software.
The EVAL-ADPD4200Z-PPG can also be connected directly to the microcontroller development system of the user, using the SPI for the ADPD4200.
For full details on the ADPD4200, see the ADPD4200 data sheet, which should be consulted in conjunction with the user guide when using the EVAL-ADPD4200Z-PPG evaluation board.
Features & Benefits
- Board supports ADPD4200 population
- ADPD4200 (SPI) is the default board population
- All inputs and outputs are accessible to the user
- 3 separately driven green LEDs are included
- 1 red and 1 IR LED included
- Metal baffle to block optical crosstalk
- Works with the Wavetool Evaluation Software allowing
- Time domain graphing and logging
- Frequency domain graphing
- Statistical analysis
- Data streaming to other applications
Documentation & Resources
UG-2028: Evaluating the ADPD4200 Multimodal Sensor Front End (Rev. 0)4/11/20221 M
ADPD4200 Business Promotion4/11/20221 M
ADPD4200 Technical Promotion4/11/20222M
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|ADPD4200BCBZR7||Material Declaration||Reliability Data||CHIPS W/SOLDER BUMPS/WLCSP|
|Wafer Fabrication Data|
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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.