Low Noise, High Sensitivity Optical Sensor Data Sheet ADPD2214 FEATURES FUNCTIONAL BLOCK DIAGRAM VCC Ultrahigh detectivity photodetector 90 fA/Hz (typical) ultralow noise floor + Signal-to-noise ratio (SNR) near shot noise limit CURRENT OUT AMPLIFIER 137 A (typical) of supply current when active 2 (E = 0 W/cm ) E ADPD2214 1 A (typical) of supply current in standby High speed, deep junction photodiode PWDN GND Nominal linear output current: 240 A (typical) Figure 1. Flexible output configuration Excellent pulse response High ambient light rejection Space-saving, 4 mm 4 mm LFCSP package APPLICATIONS Heart rate, pulse oximetry monitoring (photoplethysmography) Battery-powered medical sensors Chemical analysis GENERAL DESCRIPTION The ADPD2214 is an optical sensor optimized for biomedical life in portable applications. The ADPD2214 provides shot applications. Very low power consumption and near theoretical noise limited performance, making it an excellent choice for signal-to-noise ratio (SNR) are achieved by packaging an ultralow measuring signals with the highest possible fidelity in low light capacitance deep junction silicon photodiode operated in zero conditions. This combination of low power, very high SNR, and bias photoconductive mode with a low noise current amplifier. electromagnetic interference (EMI) immunity enables low-power The ADPD2214 offers a typical 75 kHz bandwidth performance, system solutions not possible with traditional photodiode (PD) which is well suited for use with pulsed excitation. The ADPD2214 and transimpedance amplifier (TIA) systems. uses very little power during operation and incorporates a power-down pin, enabling power cycling to optimize battery Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 13722-001ADPD2214 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Sensitivity and SNR .......................................................................9 Applications ....................................................................................... 1 Linearity ..........................................................................................9 Functional Block Diagram .............................................................. 1 Package Considerations ................................................................9 General Description ......................................................................... 1 EPAD Connection .........................................................................9 Revision History ............................................................................... 2 Applications Information .............................................................. 10 Specif icat ions ..................................................................................... 3 Powering the Device .................................................................. 10 Absolute Maximum Ratings ............................................................ 4 Power-Down ............................................................................... 10 Thermal Resistance ...................................................................... 4 Pulse Mode Operation ............................................................... 10 Soldering Profile ........................................................................... 4 Output Configuration ................................................................ 10 ESD Caution .................................................................................. 4 3-Wire Cable Voltage Configuration ....................................... 10 Pin Configuration and Function Descriptions ............................. 5 3-Wire Current Mode Configuration ...................................... 10 Typical Performance Characteristics ............................................. 6 Evaluation Board Schematic and Layout .................................... 12 Terminology ...................................................................................... 8 Outline Dimensions ....................................................................... 13 Theory of Operation ........................................................................ 9 Ordering Guide .......................................................................... 13 O ver vie w ........................................................................................ 9 Shot Noise Limited Performance ............................................... 9 REVISION HISTORY 4/16Revision 0: Initial Version Rev. 0 Page 2 of 13