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AD8335:  Quad Low Noise, Low Cost Variable Gain Amplifier

Product Details


The AD8335 is a quad variable gain amplifier (VGA) with low noise preamplifier intended for cost and power sensitive applications. Each channel features a gain range of 48 dB, fully differential signal paths, active input preamplifier matching, and user-selectable maximum gains of 46 dB and 38 dB. Individual gain controls are provided for each channel.

The preamplifier (PrA) has a single-ended to differential gain of ×8 (18.06 dB) and accepts input signals <625 mV p-p. PrA noise is 1.2 nV/√Hz and the combined input referred voltage noise of the PrA and VGA is 1.3 nV/√Hz at maximum gain.

Assuming a 20 MHz noise bandwidth (NBW), the Nyquist frequency for a 40 MHz ADC, the input SNR is 92 dB. The HLxx pin optimizes the output SNR for 10-bit and 12-bit ADCs with 1 V p-p or 2 V p-p full-scale (FS) inputs.

Channel 1 and Channel 2 are enabled through the EN12 pin and Channel 3 and Channel 4 are enabled through the EN34 pin. For VGA only applications, the PrAs can be powered down, significantly reducing power consumption.

The AD8335 is available in a 64-lead lead frame chip scale package (9 mm × 9 mm) for the industrial temperature range of −40°C to +85°C.

Applications

  • Medical imaging (ultrasound, gamma cameras)
  • Sonar
  • Test and measurement
  • Precise, stable wideband gain control
  • Data Sheet, Rev A, 08/2008

    FEATURES and BENEFITS

    • Low noise preamplifier (PrA)
    • Voltage noise = 1.3 nV/√Hz typical
    • Current noise = 2.4 pA/√Hz typical
    • NF = 7 dB (RS = RIN = 50 Ω)
    • Single-ended input; VIN maximum = 625 mV p-p
    • Active input match
    • Input SNR (noise bandwidth = 20 MHz) = 92 dB
    • VGA
      Differential output
      VOUT maximum = 5 V p-p, RL = 500 Ω differential
      Gain range (8 dB output gain step)
      −10 dB to +38 dB—low gain mode
      −2 dB to +46 dB—high gain mode
      Accurate linear-in-dB gain control
    • For additional features please see data sheet

    Functional Block Diagram for AD8335

    Documentation

    Title Content Type File Type
    AD8335: Quad Low Noise, Low Cost Variable Gain Amplifier Data Sheet  (Rev B, 02/2012) (pdf, 702 kB) Data Sheets PDF
    How Ultrasound System Considerations Influence Front-End Component Choice
    by Eberhard Brunner, Analog Devices, Inc.
    (Analog Dialogue Vol. 36, May-July 2002)
    Technical Articles HTML
    Temperature monitor measures three thermal zones
    by Susan Pratt, Analog Devices, Inc. (EDN, 12/11/03)
    Technical Articles HTML
    Variable Gain Amplifier Selection Table  (pdf, 68 kB) Product Selection Guide PDF
    ADT7301: Accurate, SPI-Compatible Temperature Sensor in SOT Package  (htm)
    (analogZone September 1, 2003)
    Product Reviews HTM
    RF Source Booklet  (PDF, 4353 kB)
    RF IC Product Overview - Version P (02/2014)
    Overview PDF
    Leading Inside Advertorials: Solving Dynamic Range Problems in Analog Systems  (pdf, 75 kB) 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

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    AD8335 SPICE Macro Model SPICE Models 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.

    SampleSample & Buy

    Price, packaging, availability

    AD8335 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD8335ACPZ Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Tray, 260 $14.25 $12.14 Y  Material Info PCN Purchase
    AD8335ACPZ-REEL Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Reel, 2500 - $12.14 Y  Material Info PCN Purchase
    AD8335ACPZ-REEL7 Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Reel, 750 $14.25 $12.14 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.

    AD8335 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD8335-EVALZ Status: Production Evaluation Board $294.19 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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