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AD8260:  High Current Driver Amplifier and Digital VGA/Preamplifier with 3 dB Steps

Product Details

Product Status:Recommended for New Designs

The AD8260 includes a high current driver, usable as a transmitter, and a low noise, digitally programmable variable gain amplifier (DGA), useable as a receiver, combined in a 5 mm × 5 mm, 32-lead chip scale package.

The receiver section consists of a single-ended input preamplifier, and linear-in-dB, differential-output VGA. Usable at dc and frequencies to 80 MHz; the –3 dB bandwidth is 180 MHz. The driver-amplifier delivers ±300 mA, well suited for driving low impedance loads, even when connected to a 3.3 V supply.

The AD8260 DGA is ideal for trim applications and has a gain span of 30 dB, in 3 dB steps. Excellent bandwidth uniformity is maintained across the entire frequency range. The DGA’s low output-referred noise is advantageous in driving high speed ADCs. The differential output facilitates the interface to modern low voltage high speed ADCs.

Single-supply and dual-supply operation makes the part versatile and enables gain control of negative-going pulses, such as generated by photodiodes or photo-multiplier tubes, as well as processing band-pass signals on a single supply. For maximum dynamic range, it is essential that the part be ac-coupled when operating on a single supply.

The AD8260 preamplifier (PrA) is user configurable with external resistors for gains greater than 6 dB; as with any high frequency op amp, the gain is inverting or noninverting. The DGA is characterized with a noninverting PrA gain of 2×. The attenuator has a range of 30 dB and the output amplifier has a gain of 8× (18.06 dB). The lowest noninverting gain range is −6 dB to +24 dB and shifts up with increased PrA gain. The gain is controlled via a parallel port (Pin GNS0 to Pin GNS3) with 10 gain steps of 3 dB per code. For any nonused code, the preamplifier and DGA are disabled.

The AD8260 can operate with single or dual supplies from 3.3 V to ±5 V. An internal buffer normally provides a split supply reference for single-supply operation; an external reference can also be used when the VMID buffer is shut down.

The operating temperature range is −40°C to +105°C. The AD8260 is available in a 32-lead LFCSP.

Applications

  • Digital AGC systems
  • Tx/Rx signal processing
  • Power-line transceivers
  • FEATURES and BENEFITS

    • Driver amplifier
    • Differential configuration—direct drive from DAC
    • Preset gain of 1.5×
    • 3 dB bandwidth: 155 MHz
    • Large output drive: >±300 mA
    • Combined preamplifier and VGA
    • Supplies: 3.3 V to 10 V (with VMID enabled)
      ±3.3 V to ±5 V (with VMID disabled)
    • Low noise
      Voltage noise: 2.4 nV/√Hz
      Current noise: 5 pA/√Hz
    • Gain range: 30 dB in 3 dB steps
      −6 dB to +24 dB (preamplifier gain = 6 dB)
    • Single-ended preamplifier input and differential output
    • −3 dB bandwidth: 180 MHz
    • Power: 93 mW with 3.3 V supplies
      Power-down for VGA, driver amplifier, and system

    Functional Block Diagram for AD8260

    Documentation

    Title Content Type File Type
    AD8260: High Current Driver Amplifier and Digital VGA/Preamplifier with 3 dB Steps Data Sheet (Rev A, 02/2011) (pdf, 418 kB) Data Sheets PDF
    RF Source Booklet  (PDF, 4353 kB)
    RF IC Product Overview - Version P (02/2014)
    Overview PDF
    RAQs index Rarely Asked Questions HTML
    What are Variable Gain Amplifiers (VGA's) and how are they used? FAQs/RAQs HTML
    Glossary of EE Terms Glossary HTML

    Evaluation Kits & Symbols & Footprints

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    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.

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    Price, packaging, availability

    AD8260 Model Options
    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.

    AD8260 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD8260-EVALZ Status: Production Evaluation Board $204.03 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.

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