The ADL5330ACPZ is a Voltage-controlled Variable Gain Amplifier/Attenuator for use in applications with frequencies up to 3GHz. The balanced structure of the signal path minimizes distortion while it also reduces the risk of spurious feed-forward at low gains and high frequencies caused by parasitic coupling. While operation between a balanced source and load is recommended, a single-sided input is internally converted to differential form. The 50R input system converts the applied voltage to a pair of differential currents with high linearity and good common rejection even when driven by a single-sided source. The signal currents are then applied to a proprietary voltage-controlled attenuator providing precise definition of overall gain under the control of the linear-in-dB interface. The gain pin accepts a voltage from 0 to 1.4V at full gain with a 20mV/dB scaling factor. The output of the high accuracy wideband attenuator is applied to a differential transimpedance output stage.
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