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ADPD2210 Fiches technique(PDF) 1 Page - Analog Devices |
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ADPD2210 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 16 page 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) |
Numéro de pièce similaire - ADPD2210 |
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Description similaire - ADPD2210 |
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