Low Noise, High Sensitivity Optical Sensor Data Sheet ADPD2212 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 ADPD2212 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, 3 mm 4 mm LFCSP package APPLICATIONS Heart rate, pulse oximetry monitoring (photoplethysmography) Battery-powered medical sensors Chemical analysis GENERAL DESCRIPTION The ADPD2212 is an optical sensor optimized for biomedical life in portable applications. The ADPD2212 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 ADPD2212 offers a typical 400 kHz bandwidth performance, system solutions not possible with traditional photodiode (PD) which is well suited for use with pulsed excitation. The ADPD2212 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. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 13721-001ADPD2212 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Shot Noise Limited Performance ................................................9 Applications ....................................................................................... 1 Sensitivity and SNR .......................................................................9 Functional Block Diagram .............................................................. 1 Linearity ..........................................................................................9 General Description ......................................................................... 1 Package Considerations ................................................................9 Revision History ............................................................................... 2 EPAD Connection .........................................................................9 Specif icat ions ..................................................................................... 3 Applications Information .............................................................. 10 Absolute Maximum Ratings ............................................................ 4 Powering the Device .................................................................. 10 Thermal Resistance ...................................................................... 4 Power-Down Mode .................................................................... 10 Soldering Profile ........................................................................... 4 Pulse Mode Operation ............................................................... 10 ESD Caution .................................................................................. 4 Output Configuration ................................................................ 10 Pin Configuration and Function Descriptions ............................. 5 3-Wire Cable Voltage Configuration ....................................... 10 Typical Performance Characteristics ............................................. 6 3-Wire Current Mode Configuration ...................................... 10 Terminology ...................................................................................... 8 Evaluation Board Schematic and Layout .................................... 12 Theory of Operation ........................................................................ 9 Outline Dimensions ....................................................................... 13 O ver vie w ........................................................................................ 9 Ordering Guide .......................................................................... 13 REVISION HISTORY 4/16Revision 0: Initial Version Rev. 0 Page 2 of 13