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AD8337:  General-Purpose, Low Cost, DC-Coupled VGA

Product Details


The AD8337 is a low noise, single-ended, linear-in-dB, general-purpose variable gain amplifier (VGA) usable at frequencies from dc to 100 MHz; the −3 dB bandwidth is 280 MHz. Excellent bandwidth uniformity across the entire gain range and low output-referred noise makes the AD8337 ideal for gain trim applications and for driving high speed analog-to-digital converters (ADCs).

Excellent dc characteristics combined with high speed make the AD8337 particularly suited for industrial ultrasound, PET scanners, and video applications. Dual-supply operation enables gain control of negative-going pulses such as generated by photodiodes or photomultiplier tubes.

The AD8337 uses the popular and versatile X-AMP® architecture, exclusively from Analog Devices, Inc., with a gain range of 24 dB. The gain control interface provides precise linear-in-dB scaling of 19.7 dB/V, referenced to VCOM.

The AD8337 includes an uncommitted operational current-feedback preamplifier (PrA) that operates in inverting or noninverting configurations. Using external resistors, the device can be configured for gains of 6 dB or greater. The AD8337 is characterized by a noninverting PrA gain of 2× using two external 100 Ω resistors. The attenuator has a range of 24 dB, and the output amplifier has a fixed gain of 8× (18.06 dB). The lowest nominal gain range is 0 dB to 24 dB and can be shifted up or down by adjusting the preamp gain. Multiple AD8337s can be connected in series for larger gain ranges, and for interstage filtering to suppress noise and distortion, and for nulling offset voltages.

The operating temperature range is –40°C to +85°C, and it is available in an 8-lead, 3 mm × 3 mm LFCSP.

APPLICATIONS

  • Gain trim
  • PET scanners
  • High performance AGC systems
  • I/Q signal processing
  • Video
  • Industrial and medical ultrasound
  • Radar receivers

FEATURES and BENEFITS

  • Low noise:
    Voltage noise = 2.2 nV/√Hz
    Current noise = 4.8 pA/√Hz (positive input)
  • Wide bandwidth (−3 dB) = 280 MHz
  • Nominal gain range: 0 dB to 24 dB (preamp gain = 6 dB)
  • Gain scaling: 19.7 dB/V
  • DC-coupled
  • Single-ended input and output
  • High speed uncommitted op amp input
  • Supplies: +5 V, ±2.5 V, or ±5 V
  • Low power: 78 mW with ±2.5 V supplies

Functional Block Diagram for AD8337

Documentation

Title Content Type File Type
AD8337: General-Purpose, Low Cost, DC-Coupled VGA Data Sheet (Rev C, 11/2009) (pdf, 785 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
Variable Gain Amplifier Selection Table  (pdf, 68 kB) Product Selection Guide PDF
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
AD8337 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

AD8337 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8337BCPZ-R2 Status: Production 8 ld LFCSP (3x3mm) 8 Ind Reel, 250 $3.48 $3.48 Y  Material Info PCN Purchase
AD8337BCPZ-REEL Status: Production 8 ld LFCSP (3x3mm) 8 Ind Reel, 5000 $2.99 $2.49 Y  Material Info PCN Purchase
AD8337BCPZ-REEL7 Status: Production 8 ld LFCSP (3x3mm) 8 Ind Reel, 1500 $2.99 $2.49 Y  Material Info PCN Purchase Sample
AD8337BCPZ-WP Status: Production 8 ld LFCSP (3x3mm) 8 Ind Tray, 50 $2.99 $2.49 Y  Material Info Notify Me 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.

AD8337 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8337-EVALZ Status: Production Evaluation Board $82.38 Yes -
AD8337-EVALZ-INV Status: Production Evaluation Board $135.33 Yes -
AD8337-EVALZ-SS Status: Production Evaluation Board $188.28 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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