ADL5330

The ADL5330 is a high performance, voltage-controlled variable gain amplifier/attenuator for use in applications with frequencies up to 3 GHz. 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 input impedance of ADL5330 is 50 from INHI to INLO. The outputs are usually coupled into a 50 grounded load via a 1:1 balun. A single supply of 4.75 V to 5.25 V is required.

The 50 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 the overall gain under the control of the linear-in-dB interface. The GAIN pin accepts a voltage from 0 V at minimum gain to 1.4 V at full gain with a 20 mV/dB scaling factor.

The output of the high accuracy wideband attenuator of ADL5330 is applied to a differential transimpedance output stage. The output stage sets the 50 differential output impedances and drives Pin OPHI and Pin OPLO. The ADL5330 has a power-down function. It can be powered down by a Logic LO input on the ENBL pin. The current consumption in power-down mode is 250 A.

The ADL5330 is fabricated on an ADI proprietary high performance, complementary bipolar IC process. The ADL5330 is available in a 24-lead (4 mm * 4 mm), Pb-free LFCSP_VQ package and is specified for operation from ambient temperatures of −40°C to +85°C. An evaluation board is also available.