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AD8334:  Quad VGA with Ultralow Noise Preamplifier and Programmable RIN

Product Details

Product Status:Recommended for New Designs

The AD8334 is an ultralow noise, quad channel linear-in-dB variable gain amplifier (VGA). Although optimized for ultrasound systems, it may be used as a low noise variable gain control in any application whose operating frequency is less than 100 MHz.

Included in each channel are an ultralow noise preamp (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamp with adjustable output limiting. The LNA gain is 19 dB with a single-ended input and differential outputs. Using a single resistor, the LNA input impedance can be adjusted to match a signal source without compromising noise performance.

The 48 dB gain range of the VGA makes these devices suitable for a variety of applications. Excellent bandwidth uniformity is maintained across the entire range. The gain control interface provides precise linear-in-dB scaling of 50 dB/V for control voltages between 40 mV and 1 V. Factory trim ensures excellent part-to-part and channel-to-channel gain matching. Differential signal paths result in superb second- and third-order distortion performance and low crosstalk.

The AD8334 is a quad version of the single AD8331 and dual AD8332.

For more information on specs, please see the AD8332 datasheet.


  • Ultrasound and Sonar time-gain controls
  • High Performance AGC Systems
  • I/Q Signal Processing
  • High Speed ADC Drivers


  • Ultralow noise (preamp)
    Voltage noise = 0.74 nV/√Hz
    Current noise = 2.5 pA/√Hz
  • 3 dB bandwidth: 100 MHz
  • Low Power: 145 mW/channel
  • Bandwidth: 100 MHz (-3 dB)
  • Wide gain range with programmable postamp
    −4.5 dB to +43.5 dB in LO gain mode
    7.5 dB to 55.5 dB in HI gain mode
  • Low output-referred noise:
    48 nV/√Hz typical
  • Active input impedance matching
  • Optimized for 10-bit/12-bit ADCs
  • Selectable output clamping level
  • AD8334 available in lead frame chip scale package

Functional Block Diagram for AD8334

Of Note . . .

Technical Article: Complete Analog Front End (AFE) for Advanced Ultrasound Equipment

For additional ADI Healthcare Products and related information, please visit


Title Content Type File Type
AD8331/AD8332/AD8334: Ultralow Noise VGAs with Preamplifier and Programmable RIN Data Sheet (Rev G, 10/2010) (pdf, 861 kB) Data Sheets PDF
Design and Operation of Automatic Gain Control Loops for Receivers in Modern Communication Systems  (pdf, 129 kB) Tutorials PDF
Ultrasound System Considerations and their Impact on Front-End Components  (pdf)
(Analog Dialogue, Vol 36, No. 3)
Analog Dialogue 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
High-Speed, 14-Bit Quad ADC Targets Medical Imaging Applications
(RF Design, June 1, 2006)
Product Reviews HTML
Analog Front End Improves Ultrasound Images
(eeProductCenter, 9/19/2005)
Product Reviews HTML
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
Medical Applications Overview HTML
What are Variable Gain Amplifiers (VGA's) and how are they used? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8334 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.

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Price, packaging, availability

AD8334 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD8334ACPZ Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Tray, 260 $18.17 $14.66 Y  Material Info PCN Purchase Sample
AD8334ACPZ-REEL Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Reel, 2500 - $14.66 Y  Material Info PCN Purchase
AD8334ACPZ-REEL7 Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Reel, 750 $18.17 $14.66 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.

AD8334 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD8334-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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