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AD8264:  235 MHz, DC Coupled VGA and Differential Quad Output Amplifier

Product Details

Product Status:Recommended for New Designs

The AD8264 is a 4-channel, linear-in-dB, general-purpose variable gain amplifier (VGA) with a preamplifier (preamp), and a flexible differential output buffer. Intended for a broad range of applications, dc coupling combined with wide band-width makes this amplifier a very good pulse processor.

Each channel includes a single-ended input preamp/VGA section to preserve the wide bandwidth and fast slew rate for low-distortion pulse applications. A 6 dB differential output buffer with common-mode and offset adjustments enable direct coupling to most modern high speed analog-to-digital converters (ADCs), using the converter reference output for perfect dc matching levels.

The −3 dB bandwidth of the preamp/VGA is dc to 235 MHz, and the bandwidth of the differential driver is 80 MHz. The floating gain control interface provides a precise linear-in-dB scale of 20 dB/V and is easy to interface to a variety of external circuits.

The gain of each channel is adjusted independently, and all channels are referenced to a single pin, GNLO. Combined with a multi-output, digital-to-analog converter (DAC), each section of the AD8264 can be used for active calibration or as a trim amplifier.

The gain range of the VGA section is 24 dB. Operation from a dual polarity power supply enables amplification of negative voltage pulses that are generated by current-sinking pulses into a grounded load, such as is typical of photodiodes or photo-multiplier tubes (PMT). Delay-free processing of wide-band video signals is also possible. The differential output amplifier permits convenient level shifting and interfacing to single-supply ADCs using the VOCM and OFSx pins.

The AD8264 is available in a 40-lead, 6 mm × 6 mm LFCSP with an operating temperature range of −40°C to +105°C.

Applications

  • Multi-Channel Data Acquisition
  • Positron Emission Tomography
  • Gain Trim
  • Industrial and Medical Ultrasound
  • Radar Receivers

FEATURES and BENEFITS

  • Low Noise
    Voltage noise = 2.3 nV/√Hz
    Current noise = 2 pA/√Hz
  • Wide Bandwidth
    Small Signal: 235 MHz (VGAx); 80 MHz (Diff. Amp Out)
    Large Signal: 80 MHz (1Vp-p)
  • Gain Range:
    0 to 24 dB (input to VGA output)
    6 to 30 dB (input to differential output)
  • Gain Scaling: 20 dB/V
  • DC-Coupled
  • Single - ended input and differential output
  • Supplies: ±2.5V to ±5V
  • Low power: 140 mW per channel @ ±3.3V

Functional Block Diagram for AD8264

Documentation

Title Content Type File Type
AD8264: Quad, 235 MHz, DC Coupled VGA and Differential Output Amplifier Data Sheet  (Rev A, 01/2011) (pdf, 309 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

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.

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Price, packaging, availability

AD8264 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8264ACPZ Status: Production 40 ld LFCSP (6x6mm w/4.1mm pad) 40 Ind Tray, 490 $14.54 $11.95 Y  Material Info PCN Purchase Sample
AD8264ACPZ-R7 Status: Production 40 ld LFCSP (6x6mm w/4.1mm pad) 40 Ind Reel, 750 $14.54 $11.95 Y  Material Info PCN Purchase
AD8264ACPZ-RL Status: Production 40 ld LFCSP (6x6mm w/4.1mm pad) 40 Ind Reel, 2500 - $11.95 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.

AD8264 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8264-EVALZ Status: Production Evaluation Board $172.41 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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