Features and Benefits

  • 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

Product Details

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

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.


ADA4961 Discussions

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Evaluation Boards Pricing displayed is based on 1-piece.
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.