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PDF ADPD2212 Data sheet ( Hoja de datos )
| Número de pieza | ADPD2212 | |
| Descripción | High Sensitivity Optical Sensor | |
| Fabricantes | Analog Devices | |
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Data Sheet
Low Noise, High Sensitivity Optical Sensor
ADPD2212
FEATURES
Ultrahigh detectivity photodetector
90 fA/√Hz (typical) ultralow noise floor
Signal-to-noise ratio (SNR) near shot noise limit
137 µA (typical) of supply current when active
(EE = 0 µW/cm2)
1 µA (typical) of supply current in standby
High speed, deep junction photodiode
Nominal linear output current: 240 µA (typical)
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
FUNCTIONAL BLOCK DIAGRAM
VCC
+
CURRENT
AMPLIFIER
–
ADPD2212
OUT
PWDN GND
Figure 1.
GENERAL DESCRIPTION
The ADPD2212 is an optical sensor optimized for biomedical
applications. Very low power consumption and near theoretical
signal-to-noise ratio (SNR) are achieved by packaging an ultralow
capacitance deep junction silicon photodiode operated in zero
bias photoconductive mode with a low noise current amplifier.
The ADPD2212 offers a typical 400 kHz bandwidth performance,
which is well suited for use with pulsed excitation. The ADPD2212
uses very little power during operation and incorporates a
power-down pin, enabling power cycling to optimize battery
life in portable applications. The ADPD2212 provides shot
noise limited performance, making it an excellent choice for
measuring signals with the highest possible fidelity in low light
conditions. This combination of low power, very high SNR, and
electromagnetic interference (EMI) immunity enables low power
system solutions not possible with traditional photodiode (PD)
and transimpedance amplifier (TIA) systems.
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADPD2212
ADPD2212
TOP VIEW
(Not to Scale)
PWDN 1
VCC 2
NIC 3
OUT 4
GND 5
+
–
10 NIC
9 NIC
8 NIC
7 NIC
6 NIC
NOTES
1. NIC = NOT INTERNALLY CONNECTED.
2. THE EXPOSED PAD MUST BE LEFT FLOATING.
THE PCB AREA UNDER THE EXPOSED PAD
CAN BE LEFT BLANK TO FACILITATE
THIS REQUIREMENT.
Figure 3. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1
PWDN
Power-Down Input. Must be connected. Pull this pin high to disable the device.
2 VCC
Supply Voltage.
3 NIC
Not Internally Connected. This pin can be grounded.
4 OUT
Output Terminal.
5 GND
Ground.
6 NIC
Not Internally Connected. This pin can be grounded.
7 NIC
Not Internally Connected. This pin can be grounded.
8 NIC
Not Internally Connected. This pin can be grounded.
9 NIC
Not Internally Connected. This pin can be grounded.
10 NIC
Not Internally Connected. This pin can be grounded.
11 EPAD
Exposed Pad. The exposed pad must be left floating. The printed circuit board (PCB) area under the exposed pad
can be left blank to facilitate this requirement.
Rev. 0 | Page 5 of 13
5 Page 
Data Sheet
ADPD2212
+
CURRENT
AMPLIFIER
–
VCC
OUT
3.3V
GND
3.3V
ADC AND
MICROPROCESSOR
RS
Figure 13. ADPD2212 Used in 3-Wire Cable Voltage Configuration
ADPD2212
ADPD2212
+
CURRENT
AMPLIFIER
–
VCC
OUT
3.3V
GND
3.3V
CF
RF
0V TO VCC – 0.75
TIA
ADC AND
MICROPROCESSOR
Figure 14. ADPD2212 Used in 3-Wire Current Mode Configuration
Rev. 0 | Page 11 of 13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ADPD2212.PDF ] | |
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