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AD603:  Low Noise, 90 MHz Variable Gain Amplifier

Product Details


The AD603 is a low noise, voltage-controlled amplifier for use in RF and IF AGC systems. It provides accurate, pin-selectable gains of −11 dB to +31 dB with a bandwidth of 90 MHz or +9 dB to 51+ dB with a bandwidth of 9 MHz. Any intermediate gain range may be arranged using one external resistor. The input referred noise spectral density is only 1.3 nV/√Hz, and power consumption is 125 mW at the recommended ±5 V supplies.

The decibel gain is linear in dB, accurately calibrated, and stable over temperature and supply. The gain is controlled at a high impedance (50 MΩ), low bias (200 nA) differential input; the scaling is 25 mV/dB, requiring a gain control voltage of only 1 V to span the central 40 dB of the gain range. An overrange and underrange of 1 dB is provided whatever the selected range. The gain control response time is less than 1 μs for a 40 dB change.

The differential gain control interface allows the use of either differential or single-ended positive or negative control voltages. Several of these amplifiers may be cascaded and their gain control gains offset to optimize the system SNR.

The AD603 can drive a load impedance as low as 100 Ω with low distortion. For a 500 Ω load in shunt with 5 pF, the total harmonic distortion for a ±1 V sinusoidal output at 10 MHz is typically −60 dBc. The peak specified output is ±2.5 V minimum into a 500 Ω load.

The AD603 uses a patented proprietary circuit topology—the X-AMP®. The X-AMP comprises a variable attenuator of 0 dB to −42.14 dB followed by a fixed-gain amplifier. Because of the attenuator, the amplifier never has to cope with large inputs and can use negative feedback to define its (fixed) gain and dynamic performance. The attenuator has an input resistance of 100 Ω, laser trimmed to ±3%, and comprises a 7-stage R-2R ladder network, resulting in an attenuation between tap points of 6.021 dB. A proprietary interpolation technique provides a continuous gain control function that is linear in dB.

The AD603 is specified for operation from −40°C to +85°C.


Applications
  • RF/IF AGC amplifiers
  • Video gain controls
  • A/D range extensions
  • Signal measurements

FEATURES and BENEFITS

  • Linear-in-dB gain control
  • Pin-programmable gain ranges
    −11 dB to +31 dB with 90 MHz bandwidth
    9 dB to 51 dB with 9 MHz bandwidth
  • Any intermediate range, for example −1 dB to +41 dB with 30 MHz bandwidth
  • Bandwidth independent of variable gain
  • 1.3 nV/√Hz input noise spectral density
  • ±0.5 dB typical gain accuracy

Functional Block Diagram for AD603

Documentation

Title Content Type File Type
AD603: Low Noise, 90 MHz Variable Gain Amplifier Data Sheet (Rev K, 04/2012) (pdf, 545 kB) Data Sheets PDF
AD603: Military Data Sheet  (Rev A, 01/2002) (pdf) Data Sheets PDF
AN-214: Ground Rules for High Speed Circuits  (pdf, 356 kB)
Layout and Wiring Are Critical in Video Converter Circuits.
Application Notes PDF
Impedance Matching Tutorial
This tutorial examines the Smith Chart and its application to transmission line impedance matching.
Tutorials HTML
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
ADI Warns Against Misuse of COTS Integrated Circuits  (pdf, 13 kB)
(Revised 1/03)
Invites Customer Participation in Creative Mil/Aero System Solutions
Recommended Reading PDF
Space Qualified Parts List  (pdf, 93 kB)
This document lists 67 (240+) space level products that are available from Analog Devices. Many of the products listed are state-of-the-art data conversion and signal processing products that were previously only available as commercial or military Class B products. Through our Space Products Group and MIL-PRF-38535 certified Level V (Class S) facility, we are pleased to offer these products to the space marketplace.
Aerospace Information PDF
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
AD603 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

AD603 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
5962-9457203MPA Status: Production 8 ld CerDIP 8 Mil Tube, 48 $47.25 $42.71 N  Material Info PCN Purchase
AD603ACHIPS Status: Production CHIPS OR DIE 0 Ind Tray, 180 - - Y  Material Info Notify Me Contact ADI
AD603AQ Status: Production 8 ld CerDIP 8 Ind Tube, 48 $7.67 $6.93 N  Material Info PCN Purchase
AD603AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $6.98 $6.32 N  Material Info Notify Me Purchase
AD603AR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $6.32 N  Material Info Notify Me Purchase
AD603AR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 750 - $6.32 N  Material Info Notify Me Purchase
AD603ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $6.17 $5.58 Y  Material Info Notify Me Purchase
AD603ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $5.58 Y  Material Info Notify Me Purchase
AD603ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 750 $6.17 $5.58 Y  Material Info Notify Me Purchase
AD603SQ/883B Status: Production 8 ld CerDIP 8 Mil Tube, 48 $47.25 $42.71 N  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.

AD603 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD603-EVALZ Status: Production Evaluation Board $76.50 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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