The ADA4320-1 is a high power, ultralow distortion amplifier designed for CATV reverse channel line driving. Its features and specifications make the ADA4320-1 ideally suited for DOCSIS 3.0and EuroDOCSIS 3.0-based applications. Both gain and output stage current are controlled via a 3-wire (SPI-compatible) interface. A single 8-bit serial word selects one of four available supply current presets and one of sixty gain codes. The ADA4320-1 has been tailored to address both the high output drive and stringent fidelity requirements of DOCSIS 3.0. The part is able to maintain excellent adjacent channel rejection performance over the full 5 MHz to 85 MHz range, even with multiple bonded channels at maximum specified output levels. The ADA4320-1 accepts a differential or single-ended input signal. The output is specified for driving a single-ended 75 load through a 4:1 impedance transformer.