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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.


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

    • 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


    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

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    AD8260-EVALZ Status: Production Evaluation Board $204.03 Yes -

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