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ADA4939-1YCPZ-R2 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADA4939-1YCPZ-R2 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 24 page Ultralow Distortion Differential ADC Driver ADA4939-1/ADA4939-2 Rev. 0 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 ©2008 Analog Devices, Inc. All rights reserved. FEATURES Extremely low harmonic distortion −102 dBc HD2 @ 10 MHz −83 dBc HD2 @ 70 MHz −77 dBc HD2 @ 100 MHz −101 dBc HD3 @ 10 MHz −97 dBc HD3 @ 70 MHz −91 dBc HD3 @ 100 MHz Low input voltage noise: 2.3 nV/√Hz High speed −3 dB bandwidth of 1.4 GHz, G = 2 Slew rate: 6800 V/μs, 25% to 75% Fast overdrive recovery of <1 ns ±0.5 mV typical offset voltage Externally adjustable gain Stable for differential gains ≥2 Differential-to-differential or single-ended-to-differential operation Adjustable output common-mode voltage Single-supply operation: 3.3 V to 5 V APPLICATIONS ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers GENERAL DESCRIPTION The ADA4939 is a low noise, ultralow distortion, high speed differential amplifier. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 100 MHz. The output common-mode voltage is user adjustable by means of an internal common-mode feedback loop, allowing the ADA4939 output to match the input of the ADC. The internal feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products. With the ADA4939, differential gain configurations are easily realized with a simple external feedback network of four resistors that determine the closed-loop gain of the amplifier. The ADA4939 is fabricated using Analog Devices, Inc., proprietary silicon-germanium (SiGe), complementary bipolar process, enabling it to achieve very low levels of distortion with an input voltage noise of only 2.3 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4939 make it well suited for a wide variety of data acquisition and signal processing applications. FUNCTIONAL BLOCK DIAGRAMS 1 –FB 2 +IN 3 –IN 4 +FB 11 –OUT 12 PD 10 +OUT 9VOCM ADA4939-1 Figure 1. ADA4939-1 ADA4939-2 1 –IN1 2 +FB1 3 +VS1 4 +VS1 5 –FB2 6 +IN2 15 –VS2 16 –VS2 17 VOCM1 18 +OUT1 14 PD2 13 –OUT2 Figure 2. ADA4939-2 –60 –110 –105 –100 –95 –90 –85 –80 –75 –70 –65 1 10 100 FREQUENCY (MHz) HD2 HD3 VOUT, dm = 2V p-p Figure 3. Harmonic Distortion vs. Frequency The ADA4939 is available in a Pb-free, 3 mm × 3 mm 16-lead LFCSP (ADA4939-1, single) or a Pb-free, 4 mm × 4 mm 24-lead LFCSP (ADA4939-2, dual). The pinout has been optimized to facilitate PCB layout and minimize distortion. The ADA4939-1 and the ADA4939-2 are specified to operate over the −40°C to +105°C temperature range; both operate on supplies between 3.3 V and 5 V. |
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