Analog Devices Inc.

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 to 16-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 ? and a differential dynamic output impedance of 50 ?,?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. Applications ADC driver for 10-bit to 14-bit GSPS converters RF/IF gain blocks Line drivers Instrumentation Satellite communications Data acquisition Military systems

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