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ADPD2210ACPZ-RL 数据表(PDF) 1 Page - Analog Devices

部件名 ADPD2210ACPZ-RL
功能描述  Ultralow noise, low power current amplifier
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADPD2210ACPZ-RL 数据表(HTML) 1 Page - Analog Devices

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Ultralow Noise, Low Power
Current Amplifier
Data Sheet
ADPD2210
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
Ultralow noise, low power current amplifier
80 fA/√Hz (typical) noise floor
140 μA (typical) of supply current when active (EE = 0 μW/cm2)
100 nA (typical) of supply current in standby
Flexible output configuration
Optimized for pulsed systems
Nominal linear output: 240 μA
Space-saving 2 mm × 2 mm LFCSP package
APPLICATIONS
Photoplethysmography
Photodiode measurements
Small current pulsed amperometry
Any application requiring the ultralow noise amplification of
small currents
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
GENERAL DESCRIPTION
The ADPD2210 is a low noise current amplifier designed to
allow the use of smaller photodiodes by amplifying sensor signal
currents by a factor of 24 while adding minimal noise. This
amplification provides the system sensitivity of a large photodiode
with the benefits of a smaller photodiode. A minimum linearity
of 60 dB allows accurate extraction of very small time variant
signals on top of large dc or low frequency offsets.
The ADPD2210 is optimized for pulse mode applications such
as wrist worn heart rate monitoring (HRM) or finger worn
pulse oximeter oxygen saturation (SpO2), where low power
consumption and rejection of ambient light is critical. In photodi-
ode applications, the ADPD2210 holds the sensor input to
within ±5 mV (typical) of the reference terminal, providing
near zero-bias voltage and allowing minimal dark current and
shot noise limited performance.
The ADPD2210 is designed for applications where power
conservation is critical. The ADPD2210 uses very little power,
typically 140 μA with no input to 954 μA at full scale. A power-
down pin places the ADPD2210 in standby when sensing is
inactive. This mode adds critical time for battery-powered
monitoring and can reduce battery costs in disposable applications
Using the ADPD2210 to provide sensor site amplification
reduces the effect of electromagnetic interference (EMI) in low
level wired interfaces, providing improved signal-to-noise ratio
(SNR) and rejection of interferer signals from nearby equipment.
The combination of low power, high SNR, and EMI immunity
enables low power system solutions not possible with traditional
small current sensors, such as photodiodes plus transimpedance
amplifiers (TIAs).
IN
PWDN
OUT
10nA
POWER-DOWN
LOGIC
BIAS
24 × CURRENT MIRROR
VCC – (2 × VBE)


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