Photometric Front Ends
Features and Benefits
- Multifunction photometric front end
- Fully integrated AFE, ADC, LED drivers, and timing core
- Enables ambient light rejection capability without the need for photodiode optical filters
- Three 370 mA LED peak current drivers
- Flexible, multiple, short LED pulses per optical sample
- 20-bit burst accumulator enabling 20 bits per sample period
- On-board sample to sample accumulator, enabling up to 27 bits per data read
- Low power operation
- SPI, I2C interface, and 1.8 V analog/digital core
- Flexible sampling frequency ranging from 0.122Hz to 2700 Hz
- FIFO data operation
- Qualified for automotive applications
The ADPD1080/ADPD1081 are highly efficient, photometric front ends, each with an integrated 14-bit analog-to-digital converter (ADC) and a 20-bit burst accumulator that works with flexible light emitting diode (LED) drivers. The ADPD1080/ADPD1081 stimulate an LED and measures the corresponding optical return signal. The data output and functional configuration occur over a 1.8 V I2C interface on the ADPD1080 or a serial port interface (SPI) on the ADPD1081. The control circuitry includes flexible LED signaling and synchronous detection.
The analog front end (AFE) features rejection of signal offset and corruption due to modulated interference commonly caused by ambient light without the need for optical filters or dc cancellation circuitry that requires external control.
Couple the ADPD1080/ADPD1081 with a low capacitance photodiode of <100 pF for optimal performance. The ADPD1080/ADPD1081 can be used with any LED. The ADPD1080 is available in a 16-ball, 2.46 mm × 1.4 mm WLCSP and a 28-lead, 4 mm × 4 mm LFCSP. The SPI only version, ADPD1081, is available in a 17-ball, 2.46 mm × 1.4 mm WLCSP.
- Wearable health and fitness monitors
- Clinical measurements, for example, SpO2
- Industrial monitoring
- Background light measurements
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-ADPD1081Z-PPG evaluation board provides users with a simple means of evaluating the ADPD1080/ADPD1081 photometric front end with an optimized discrete optical design for vital signs monitoring applications. The evaluation system includes the Applications Wavetool graphical user interface (GUI) that provides users with low level and high level configurability, real-time frequency and time domain analysis, and user datagram protocol (UDP) transfer capability so the evaluation board can easily interface to the user development system.
The EVAL-ADPD1081Z-PPG is powered through the ribbon cable from the EVAL-ADPDUCZ microcontroller board (obtained separately). The evaluation board provides three green light emitting diodes (LEDs) and a 7 mm2 photodiode (PD). The design of the evaluation board is optimized for wrist-based photoplethysmography (PPG) measurements.
For additional information on the functionality of the ADPD1080/ ADPD1081, refer to the ADPD1080/ADPD1081 data sheet.
Features & Benefits
- Supports the detection of UART
- UDP transfer capability
- ADPD1080/ADPD1081 full configuration
- Register level
- High level
- Graph view
- Time graph
- Frequency graph
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.