SP Amp Variable Gain Amp Single ±6V 14-Pin SOIC Tube

The VCA820 is a dc-coupled, wideband, linear in dB, continuously variable, voltage-controlled gain amplifier. It provides a differential input to single-ended conversion with a high-impedance gain control input used to vary the gain down 40dB from the nominal maximum gain set by the gain resistor (RG) and feedback resistor (RF). The VCA820 internal architecture consists of two input buffers and an output current feedback amplifier stage integrated with a multiplier core to provide a complete variable gain amplifier (VGA) system that does not require external buffering. The maximum gain is set externally with two resistors, providing flexibility in designs. The maximum gain is intended to be set between +2V/V and +100V/V. Operating from ±5V supplies, the gain control voltage for the VCA820 adjusts the gain linearly in dB as the control voltage varies from 0V to +2V. For example, set for a maximum gain of +10V/V, the VCA820 provides 20dB, at +2V input, to –20dB at 0V input of gain control range. The VCA820 offers excellent gain linearity. For a 20dB maximum gain, and a gain-control input voltage varying between 1V and 2V, the gain does not deviate by more than ±0.4dB (maximum at +25°C).

150MHz SMALL-SIGNAL BANDWIDTH

137MHz, 5V_PP BANDWIDTH (G = +10V/V)

0.1dB GAIN FLATNESS to 28MHz

1700V/µs SLEW RATE

> 40dB GAIN ADJUST RANGE

HIGH GAIN ACCURACY: 20dB ±0.4dB

HIGH OUTPUT CURRENT: 160mA

APPLICATIONS

• AGC RECEIVERS with RSSI
• DIFFERENTIAL LINE RECEIVERS
• PULSE AMPLITUDE COMPENSATION
• VARIABLE ATTENUATORS
• DROP-IN UPGRADE TO LMH6502