ADA4939-2:  Ultralow Distortion Differential ADC Driver

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 ...More

ADA4939-2:  Ultralow Distortion Differential ADC Driver

Product 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.

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.

Applications

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

    • Data Sheet, Rev. 0, 5/08

    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

    Diagrams

    ADA4939-2 Diagram
    Functional Block Diagram for ADA4939-2

    技术指标

    -3 dB BW (MHz) 1400MHz
    Minimum Gain (Acl) 2
    Supply Current (max) 37.7mA
    Slew Rate (V/us) 6800V/µs
    Distortion (2nd) (dBc) -77dBc
    Distortion (3rd) (dBc) -91dBc
    Package 16-Lead LFCSP

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    订阅新产品资料 More
    Part# -3 dB BW (MHz) Minimum Gain (Acl) Voltage Supply (V) Supply Current (max) 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 $3.80
    AD8139 410 1 5 to 12 24.5mA 800 -90 -105 8-Lead CSP, 8-Lead SOIC $3.63
    AD8350 900 - 4 to 11 32mA 2000 -67 -70 8-Lead SOIC/8-Lead uSOIC $2.52
    AD8351 2200 1 3 to 5.5 32mA 13000 -79 -81 10-Lead uSOIC $2.68
    AD8352 2200 - 3 to 5.5 37mA 11000 -81 -82 16-Lead LFCSP $3.53
    ADA4922-1 38 1 +/- 12 9.4mA 730 -116 -109 - $3.63
    ADA4937-1 1900 1 3 to 5.25 39.5mA 6000 -70 -84 16-Lead LFCSP $3.84
    ADA4937-2 1900 1 3 to 5.25 42mA 6000 -77 -84 16-Lead LFCSP, 24-Lead LFCSP $5.76
    ADA4938-1 1000 1 4.5 to 11 40mA 4700 -82 -82 16-Lead LFCSP, 24-Lead LFCSP $3.84
    ADA4938-2 1000 1 4.5 to 11 36.5mA 4700 -82 -82 16-Lead LFCSP, 24-Lead LFCSP $5.76
    ADA4939-1 1400 2 3 to 5 37.7mA 6800 -77 -95 16-Lead LFCSP $3.84
    ADA4939-2 1400 2 3 to 5 37.7mA 6800 -77 -91 16-Lead LFCSP $5.76
    ADA4941-1 30 2 - 2.3mA 22 -75 -71 8-Lead LFCSP, 8-Lead SOIC $2.42

    * 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.
    ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

    价格、封装以及购买