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ADA4950-1:  Low Power Selectable Gain Differential ADC Driver, G = 1, 2, 3

Product Details


The ADA4950-1/ADA4950-2 are gain-selectable versions of the ADA4932-1/ADA4932-2 with on-chip feedback and gain resistors with on-chip feedback and gain resistors. It is an ideal choice for driving high performance ADCs as a single-ended-to-differential or differential-to-differential amplifier. The output common-mode voltage is user adjustable by means of an internal common-mode feedback loop, allowing the ADA4950-x 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.

Differential gain configurations of 1, 2, and 3 are easily realized with internal feedback networks that are connected externally to set the closed-loop gain of the amplifier.

The ADA4950-1/ADA4950-2 are fabricated using the Analog Devices, Inc., proprietary silicon-germanium (SiGe) complementary bipolar process, enabling them to achieve low levels of distortion and noise at low power consumption. The low offset and excellent dynamic performance of the ADA4950-x make it well suited for a wide variety of data acquisition and signal processing applications.

The ADA4950-x is available in a Pb-free, 3 mm × 3 mm, 16-lead LFCSP (ADA4950-1, single) or a Pb-free 4 mm × 4 mm, 24-lead LFCSP (ADA4950-2, dual). The pinout has been optimized to facilitate PCB layout and minimize distortion. The ADA4950-1/ADA4950-2 are specified to operate over the -40°C to +105°C temperature range; both operate on supplies from +3 V to ±5 V.

Applications
  • ADC drivers
  • Single-ended-to-differential converters
  • IF and baseband gain blocks
  • Differential buffers
  • Line drivers
  • FEATURES and BENEFITS

    • High performance at low power
    • High speed
      -3 dB bandwidth of 750 MHz, G = 1
      0.1 dB flatness to 210 MHz, VOUT, dm = 2 V p-p, RL, dm = 200 Ω
      Slew rate: 2900 V/µs, 25% to 75%
      Fast 0.1% settling time of 9 ns
    • Low power: 9.5 mA per amplifier
    • Low harmonic distortion
      108 dB SFDR @ 10 MHz
      98 dB SFDR @ 20 MHz
    • Low output voltage noise: 9.2 nV/√Hz, G = 1, RTO
    • ±0.2 mV typical input offset voltage
    • Selectable differential gains of 1, 2, and 3
    • Differential-to-differential or single-ended-to-differential operation
    • Adjustable output common-mode voltage
    • Input common-mode range shifted down by one VBE
    • Wide supply range: +3 V to ±5 V
    • Available in 16-lead and 24-lead LFCSP packages

    Functional Block Diagram for ADA4950-1

    Documentation

    Title Content Type File Type
    ADA4950-1/ADA4950-2: Low Power, Selectable GainDifferential ADC Driver, G = 1, 2, 3 Data Sheet (Rev A, 03/2013) (pdf, 812 kB) Data Sheets PDF
    AN-1026: High Speed Differential ADC Driver Design Considerations  (pdf, 355 kB) Application Notes PDF
    AN-0990: Terminating a Differential Amplifier in Single-Ended Input Applications  (pdf, 181 kB) Application Notes PDF
    AN-0992: Active Filter Evaluation Board for Differential Amplifiers  (pdf, 85 kB) Application Notes PDF
    AN-282: Fundamentals of Sampled Data Systems  (pdf, 2131 kB) Application Notes PDF
    AN-649: Using the Analog Devices Active Filter Design Tool  (pdf, 5301 kB) Application Notes PDF
    AN-584: Using the AD813X Differential Amplifier  (pdf, 174 kB)
    The AD813x differs from conventional op amps by the external presence of an additional input and output. The additional input, VOGM, controls the output common mode voltage.
    Application Notes PDF
    AN-589: Ways to Optimize the Performance of a Difference Amplifier  (pdf, 115 kB)
    This Application Note presents several ways to build and optimize the performance of a discrete difference amplifier. It also recommends amplifiers that will make the overall solution cost/performance competitive with monolithic instrument amplifiers.
    Application Notes PDF
    MT-218: Multiple Feedback Band-Pass Design Example  (pdf, 0) Tutorials PDF
    MT-076: Differential Driver Analysis  (pdf, 95 kB) Tutorials PDF
    MT-075: Differential Drivers for High Speed ADCs Overview  (pdf, 183 kB) Tutorials PDF
    A Stress-Free Method for Choosing High-Speed Op Amps
    A decision-tree approach to making the critical decision about high-speed op amp selection, including a look at some helpful tools.
    Webcasts WEBCAST
    UG-102: Evaluation Board for Single High Speed Selectable Gain Differential Amplifiers (16-Lead, 3 mm × 3 mm LFCSP)  (pdf, 221 kB) User Guides PDF
    "Rules of the Road" for High-Speed Differential ADC Drivers
    (Analog Dialogue, Vol. 43, No. 5, 2009)
    Analog Dialogue HTML
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    ADI DiffAmpCalc™
    ADI's new ADI DiffAmpCalc™ is a free, downloadable calculator for designing differential amplifier circuits. The tool is easy to use and features an interactive user interface to quickly get you up and running.
    ADIsim Design/Simulation Tools HTML
    ADA4950 SPICE Macro Model SPICE Models HTML

    Evaluation Kits & Symbols & Footprints

    Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

    Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

    SampleSample & Buy

    Price, packaging, availability

    ADA4950-1 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    ADA4950-1YCPZ-R2 Status: Production 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 250 $3.71 $3.71 Y  Material Info PCN Purchase
    ADA4950-1YCPZ-R7 Status: Production 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 1500 - $2.99 Y  Material Info PCN Purchase Sample
    ADA4950-1YCPZ-RL Status: Production 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 5000 - $2.99 Y  Material Info PCN Purchase
    Price Table Help

    The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

    ADA4950-1 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    ADA4950-1YCP-EBZ Status: Production 16-Lead LFCSP Bare Evaluation Board $18.26 Yes -
    ADA4950-1YCPZ-R7 Status: Production 16-Lead LFCSP - Yes -

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

    Check Inventory & Purchase

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