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ADA4938-2ACPZ-RL Datasheet(PDF) 1 Page - Analog Devices |
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ADA4938-2ACPZ-RL Datasheet(HTML) 1 Page - Analog Devices |
1 / 26 page Ultralow Distortion Differential ADC Driver Data Sheet ADA4938-1/ADA4938-2 Rev. B 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 ©2007–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Extremely low harmonic distortion (HD) −106 dBc HD2 @ 10 MHz −82 dBc HD2 @ 50 MHz −109 dBc HD3 @ 10 MHz −82 dBc HD3 @ 50 MHz Low input voltage noise: 2.6 nV/√Hz High speed −3 dB bandwidth of 1000 MHz, G = +1 Slew rate: 4700 V/μs 0.1 dB gain flatness to 150 MHz 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 to ±5 V Single or dual amplifier configuration available APPLICATIONS ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers GENERAL DESCRIPTION The ADA4938-1/ADA4938-2 are low noise, ultralow distortion, high speed differential amplifiers. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 27 MHz, or up to 12 bits from dc to 74 MHz. The output common-mode voltage is adjustable over a wide range, allowing the ADA4938-1/ADA4938-2 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/ADA4938-2. A simple external feedback network of four resistors determines the closed-loop gain of the amplifier. The ADA4938-1/ADA4938-2 are fabricated using the Analog Devices, Inc., proprietary third generation, high voltage XFCB process, enabling it to achieve very low levels of distortion with an input voltage noise of only 2.6 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4938-1/ADA4938-2 FUNCTIONAL BLOCK DIAGRAMS PD 12 11 10 1 3 49 2 ADA4938-1 TOP VIEW –FB +IN –IN +FB –OUT +OUT VOCM Figure 1. ADA4938-1 Functional Block Diagram PD2 2 1 3 4 5 6 18 17 16 15 14 13 +IN2 –FB2 +VS1 +VS1 +FB1 –IN1 –OUT2 –VS2 –VS2 VOCM1 +OUT1 ADA4938-2 TOP VIEW Figure 2. ADA4938-2 Functional Block Diagram –50 –60 –70 –80 –90 –100 –110 –120 –130 1 10 100 FREQUENCY (MHz) G = +2, VO, dm = 1V p-p G = +2, VO, dm = 2V p-p G = +2, VO, dm = 3.2V p-p G = +2, VO, dm = 5V p-p Figure 3. SFDR vs. Frequency and Output Voltage makes them well-suited for a wide variety of data acquisition and signal processing applications. The ADA4938-1 (single amplifier) is available in a Pb-free, 3 mm × 3 mm, 16-lead LFCSP. The ADA4938-2 (dual amplifier) is available in a Pb-free, 4 mm × 4 mm, 24-lead LFCSP. The pinouts have been optimized to facilitate layout and minimize distortion. The devices are specified to operate over the extended industrial temperature range of −40°C to +85°C. |
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