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ADA4938-1 Datasheet(PDF) 1 Page - Analog Devices |
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ADA4938-1 Datasheet(HTML) 1 Page - Analog Devices |
1 / 9 page Ultra-Low Distortion Differential ADC Driver Preliminary Technical Data ADA4938-1 Rev. PrA Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Extremely low harmonic distortion −108 dBc HD2 @ 10 MHz −79 dBc HD2 @ 70 MHz −125 dBc HD3 @ 10 MHz −87 dBc HD3 @ 70 MHz Low input voltage noise: 2.2 nV/√Hz High speed −3 dB bandwidth of 1.5 GHz, G = 1 Slew rate: 4700 V/μs 0.1 dB gain flatness to 125 MHz Fast settling to 0.01% in 8.5 ns Fast overdrive recovery of 4 ns 1 mV typical offset voltage Externally adjustable gain Differential to differential or single-ended to differential operation Adjustable output common-mode voltage Wide Supply Voltage Range: +5 V & ± 5 V Pb-free 3 mm x 3 mm LFCSP package APPLICATIONS ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers FUNCTIONAL BLOCK DIAGRAM Figure 1. GENERAL DESCRIPTION The ADA4938-1 is a low noise, ultra-low distortion, high speed differential amplifier. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 70 MHz. The output common mode voltage is adjustable over a wide range, allowing the ADA4938-1 to match the input of the ADC. The internal common mode feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products. Full differential and single-ended to differential gain configurations are easily realized with the ADA4938-1. A simple external feedback network of four resistors determines the amplifier’s closed-loop gain. The ADA4938-1 is fabricated using ADI’s proprietary third generation high-voltage XFCB process, enabling it to achieve very low levels of distortion with input voltage noise of only 2.2 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4938-1 make it well suited for a wide variety of data acquisition and signal processing and applications. The ADA4938-1 is available in a Pb-free, 3 mm x 3mm lead frame chip scale package (LFCSP). It is specified to operate over the extended industrial temperature range of −40°C to +85°C. |
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