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AD605:  Dual, Low Noise, Single-Supply Variable Gain Amplifier

Product Details


The AD605 is a low noise, accurate, dual-channel, linear-in-dB variable gain amplifier (VGA), optimized for any application requiring high performance, wide bandwidth variable gain control. Operating from a single 5 V supply, the AD605 provides differential inputs and unipolar gain control for ease of use. Added flexibility is achieved with a user-determined gain range and an external reference input that provide user-determined gain scaling (dB/V).

The high performance linear-in-dB response of the AD605 is achieved with the differential input, single-supply, exponential amplifier (DSX-AMP) architecture. Each of the DSX-AMPs comprises a variable attenuator of 0 dB to −48.4 dB followed by a high speed, fixed-gain amplifier. The attenuator is based on a 7-stage R-1.5R ladder network. The attenuation between tap points is 6.908 dB, and 48.360 dB for the entire ladder network. The DSX-AMP architecture results in 1.8 nV/√Hz input noise spectral density and accepts a ±2.0 V input signal when VOCM is biased at VP/2.

Each independent channel of the AD605 provides a gain range of 48 dB that can be optimized for the application. Gain ranges between −14 dB to +34 dB and 0 dB to +48 dB can be selected by a single resistor between Pin FBK and Pin OUT. The lower and upper gain ranges are determined by shorting Pin FBK to Pin OUT or leaving Pin FBK unconnected, respectively. The two channels of the AD605 can be cascaded to provide 96 dB of very accurate gain range in a monolithic package.

The gain control interface provides an input resistance of approximately 2 MΩ and scale factors from 20 dB/V to 30 dB/V for a VREF input voltage of 2.5 V to 1.67 V, respectively. Note that scale factors up to 40 dB/V are achievable with reduced accuracy for scales above 30 dB/V. The gain scales linearly in dB with control voltages (VGN) of 0.4 V to 2.4 V for the 20 dB/V scale and 0.20 V to 1.20 V for the 40 dB/V scale. When VGN is <50 mV, the amplifier is powered down to draw 1.9 mA. Under normal operation, the quiescent supply current of each amplifier channel is only 18 mA.

The AD605 is available in a 16-lead PDIP and a 16-lead SOIC_N package and is guaranteed for operation over the −40°C to +85°C temperature range.

Applications

  • Ultrasound and sonar time-gain controls
  • High performance AGC systems
  • Signal measurement
  • Data Sheet, Rev. E, 5/07

    FEATURES and BENEFITS

    • 2 independent linear-in-dB channels
    • Input noise at maximum gain: 1.8 nV/√Hz, 2.7 pA/√Hz
    • Bandwidth: 40 MHz (–3 dB)
    • Differential input
    • Absolute gain range programmable
      –14 dB to +34 dB (FBK shorted to OUT) through
    • Variable gain scaling: 20 dB/V through 40 dB/V
    • Stable gain with temperature and supply variations
    • Single-ended unipolar gain control
    • Output common mode independently set
    • Power shutdown at lower end of gain control
    • Single 5 V supply
    • Low power: 90 mW/channel

    Functional Block Diagram for AD605

    Documentation

    Title Content Type File Type
    AD605: Dual, Low Noise, Single-Supply Variable Gain Amplifier Data Sheet  (Rev F, 06/2008) (pdf, 411 kB) Data Sheets PDF
    Design and Operation of Automatic Gain Control Loops for Receivers in Modern Communication Systems  (pdf, 129 kB) Tutorials PDF
    Choosing High-Speed Signal Processing Components for Ultrasound Systems
    (Analog Dialogue, Vol. 29, No. 2, 1995)
    Analog Dialogue 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
    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
    AD605 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

    AD605 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD605ACHIPS Status: Production CHIPS OR DIE 0 Ind Tray, 140 - - Y  Material Info Notify Me Contact ADI
    AD605ANZ Status: Production 16 ld PDIP 16 Ind Tube, 25 $13.27 $10.62 Y  Material Info PCN Purchase
    AD605AR Status: Last Time Buy 16 ld SOIC 16 Ind Tube, 48 $14.28 $11.42 N  Material Info PCN/PDN Purchase
    AD605AR-REEL Status: Last Time Buy 16 ld SOIC 16 Ind Reel, 2500 - $11.42 N  Material Info PCN/PDN Purchase
    AD605AR-REEL7 Status: Last Time Buy 16 ld SOIC 16 Ind Reel, 750 $14.28 $11.42 N  Material Info PCN/PDN Purchase
    AD605ARZ Status: Production 16 ld SOIC 16 Ind Tube, 48 $12.64 $10.11 Y  Material Info PCN Purchase
    AD605ARZ-R7 Status: Production 16 ld SOIC 16 Ind Reel, 1000 $12.64 $10.11 Y  Material Info PCN Purchase
    AD605ARZ-RL Status: Production 16 ld SOIC 16 Ind Reel, 2500 $12.64 $10.11 Y  Material Info PCN Purchase
    AD605BN Status: Last Time Buy 16 ld PDIP 16 Ind Tube, 25 $14.95 $11.97 N  Material Info PCN/PDN Purchase
    AD605BR Status: Last Time Buy 16 ld SOIC 16 Ind Tube, 48 $16.41 $13.14 N  Material Info PCN/PDN Purchase
    AD605BR-REEL Status: Last Time Buy 16 ld SOIC 16 Ind Reel, 2500 - $13.14 N  Material Info PCN/PDN Purchase
    AD605BR-REEL7 Status: Last Time Buy 16 ld SOIC 16 Ind Reel, 1000 $16.41 $13.14 N  Material Info PCN/PDN Purchase
    AD605BRZ Status: Production 16 ld SOIC 16 Ind Tube, 48 $14.52 $11.63 Y  Material Info PCN Purchase
    AD605BRZ-R7 Status: Production 16 ld SOIC 16 Ind Reel, 1000 $14.52 $11.63 Y  Material Info PCN Purchase
    AD605BRZ-RL Status: Last Time Buy 16 ld SOIC 16 Ind Reel, 2500 - $11.63 Y  Material Info PCN/PDN 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.

    AD605 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD605-EVALZ Status: Production Evaluation Board $247.12 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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