ADA4961:  Low Distortion, 3.2 GHz, RF DGA

Product Details

Product Status:Recommended for New Designs

The ADA4961 is a high performance, BiCMOS RF digital gain amplifier (DGA), optimized for driving heavy loads out to 2.0 GHz and beyond. The device typically achieves −90 dBc IMD3 performance at 500 MHz and −85 dBc at 1.5 GHz. This RF performance allows GHz converters to achieve their optimum performance with minimal limitations of the driver amplifier or constraints on overall power that typically result from GaAs amplifiers. This device can easily drive 10-bit to16-bit HS converters.

For many receiver applications, antialias filter (AAF) designs can be simplified or not required.

The ADA4961 has an internal differential input impedance of 100 Ω and a differential dynamic output impedance of 50 Ω, eliminating the need for external termination resistors. The digital adjustability provides for 1 dB resolution, thus optimizing the signal-to-noise ratio (SNR) for input levels spanning 21 dB.

The ADA4961 is optimized for wideband, low distortion performance at frequencies up to 2 GHz. These attributes, together with wide gain adjustment and relatively low power, make the ADA4961 the amplifier of choice for many high speed applications, including IF, RF, and broadband applications where dynamic range at very high frequencies is critical.

The ADA4961 is ideally suited for driving not only analog-to-digital converters (ADCs), but also mixers, pin diode attenuators, SAW filters, and multielement discrete devices. It is available in a 4 mm × 4 mm, 24-lead LFCSP and operates over a temperature range of −40°C to +85°C.


  • ADC driver for 10-bit to 14-bit GSPS converters
  • RF/IF gain blocks
  • Line drivers
  • Instrumentation
  • Satellite communications Data acquisition
  • Military systems


  • High speed
       −3 dB bandwidth: 3.2 GHz
       −1 dB bandwidth: 1.8 GHz
       Slew rate: 12,000 V/μs
  • Digitally adjustable gain
       Voltage gain: −6 dB to +15 dB
       Power gain: −3 dB to +18 dB
       5-bit parallel or SPI bus gain control with fast attack
  • Differential impedances: 100 Ω input, 50 Ω output
  • Low power mode operation, power-down control
  • IMD3/HD3 distortion, maximum gain, 5 V, high performance (HP) mode
       IMD3/HD3 at 1 GHz: −90 dBc/−83 dBc
       IMD3/HD3 at 1.5 GHz: −85 dBc/−75 dBc
       IMD3/HD3 at 2 GHz: −70 dBc/−70 dBc
  • Low noise
       Noise figure: 5.6 dB at AV = 15 dB
  • Single 3.3 V or 5 V supply operation
  • Available in 24-lead, 4 mm × 4 mm LFSCP

Functional Block Diagram for ADA4961

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADA4961 S-Parameters  (zip, 1746 kB) S-Parameters ZIP
ADA4961 Evaluation Board Test Procedure  (pdf, 535 kB) Evaluation Software PDF
ADA4961 Evaluation Board Software  (zip, 20051 kB) Evaluation Software ZIP

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

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.

ADA4961 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EV-ADA4961SDP1Z Status: Production Evaluation Board $200.00 Yes -
EVAL-SDP-CS1Z Status: Production SDP-S Controller Board - Interface to EV-ADA4961SD1Z (also required) $49.00 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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