ADA4961

Data Sheet Low Distortion, 3.2 GHz, RF DGA ADA4961 FEATURES 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 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 density referred to output (RTO): −154 dBm/Hz Noise figure: 5.5 dB at AV = 15 dB, 1 GHz Differential impedances: 100 Ω input, 50 Ω output Low power mode operation, power-down control Single 3.3 V or 5 V supply operation Available in 24-lead, 4 mm × 4 mm LFCSP APPLICATIONS ADC driver for 10-bit to 14-bit GSPS converters RF/IF gain blocks Line drivers Instrumentation Satellite communications Data acquisition Military systems GENERAL DESCRIPTION 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...