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

The ADA4950-1/ADA4950-2 are gain-selectable versions of the ADA4932-1/ADA4932-2 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 ...More

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

Product Description

The ADA4950-1/ADA4950-2 are gain-selectable versions of the ADA4932-1/ADA4932-2 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-x is fabricated using the Analog Devices, Inc., proprietary silicon-germanium (SiGe) complementary bipolar process, enabling it 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

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    • 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
    • -3 dB BW (MHz): 750MHz
    • Minimum Gain (Acl): 1
    • Supply Current : 9.5mA
    • Slew Rate (V/us): 2900V/µs
    • Distortion (2nd) (dBc): -80dBc
    • Distortion (3rd) (dBc): -84dBc
    • Package: 16-Lead LFCSP,24-Lead LFCSP

    Functional Block Diagram for ADA4950-2

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    Part# -3 dB BW (MHz) Minimum Gain (Acl) Voltage Supply (V) Supply Current Slew Rate (V/us) Distortion (2nd) (dBc) Distortion (3rd) (dBc) Package Price* (1000-4999)
    AD6630 700 - +/- 5 30mA 3700 - - 16-Lead SOIC $4.18
    AD8132 350 1 +/- 5 10.7mA 1200 -97 -100 8-Lead MSOP, 8-Lead SOIC $1.67
    AD8137 110 1 +/- 6 3.6mA 450 -85 -85 8-Lead SOIC $1.10
    AD8138 320 1 +/- 5 20mA 1500 -94 -114 8-Lead CSP, 8-Lead SOIC $3.75
    AD8139 410 1 5 to 12 24.5mA 800 -90 -105 8-Lead CSP, 8-Lead SOIC $3.75
    AD8350 900 - 4 to 11 28mA 2000 -66 -65 8-Lead SOIC/8-Lead uSOIC $2.52
    AD8351 2200 1 3 to 5.5 28mA 13000 -79 -81 10-Lead uSOIC $2.68
    AD8352 2200 - 3 to 5.5 37mA 11000 -83 -83 16-Lead LFCSP $3.53
    ADA4922-1 38 1 +/- 12 9.4mA 730 -116 -109 - $3.63
    ADA4927-1 2300 1 4.5 to 11 22.1mA 5000 -87 -89 16-Lead LFCSP $3.79
    ADA4927-2 2300 1 4.5 to 11 22.1mA 5000 -87 -89 24-Lead LFCSP $6.29
    ADA4932-1 560 1 3 to 11 9.6mA 410 -72 -80 16-Lead LFCSP $2.95
    ADA4932-2 560 1 3 to 11 9.6mA 410 -72 -80 24-Lead LFCSP $5.29
    ADA4937-1 1900 1 3 to 5.25 39.5mA 6000 -70 -84 16-Lead LFCSP $3.79
    ADA4937-2 1900 1 3 to 5.25 42mA 6000 -77 -84 16-Lead LFCSP, 24-Lead LFCSP $5.69
    ADA4938-1 1000 1 4.5 to 11 40mA 4700 -82 -82 16-Lead LFCSP, 24-Lead LFCSP $3.79
    ADA4938-2 1000 1 4.5 to 11 36.5mA 4700 -82 -82 16-Lead LFCSP, 24-Lead LFCSP $5.69
    ADA4939-1 1400 2 3 to 5 37.7mA 6800 -77 -95 16-Lead LFCSP $3.79
    ADA4939-2 1400 2 3 to 5 37.7mA 6800 -77 -91 16-Lead LFCSP $5.69
    ADA4941-1 30 2 - 2.3mA 22 -75 -71 8-Lead LFCSP, 8-Lead SOIC $2.42
    ADA4950-1 750 1 3 to 11 9.5mA 2900 -80 -84 16-Lead LFCSP, 24-Lead LFCSP $2.99
    ADA4950-2 750 1 3 to 11 9.5mA 2900 -80 -84 16-Lead LFCSP, 24-Lead LFCSP $5.29
    ADL5561 2900 6 3.3 40mA 9800 -95 -87 16-Lead LFCSP $3.68
    ADL5562 3300 6 3.3 80mA 9800 -104 -87 16-Lead LFCSP $3.68
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    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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    *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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.