GENERAL DESCRIPTION
The AD603 is a low noise, voltage-controlled amplifier for use in RF and IF AGC systems. It provides accurate, pin selectable gains of −11 dB to +31 dB with a bandwidth of 90 MHz or 9 dB to 51 dB with a bandwidth of 9 MHz. Any intermediate gain range may be arranged using one external resistor. The input referred noise spectral density is only 1.3 nV/√Hz and power consumption is 125 mW at the recommended ±5 V supplies.

FEATURES
    Linear-in-dB gain control
    Pin programmable gain ranges
        −11 dB to +31 dB with 90 MHz bandwidth
        9 dB to 51 dB with 9 MHz bandwidth
    Any intermediate range, for example −1 dB to +41 dB with 30 MHz bandwidth
    Bandwidth independent of variable gain
    1.3 nV/√Hz input noise spectral density
    ±0.5 dB typical gain accuracy

APPLICATIONS
    RF/IF AGC amplifier
    Video gain control
    A/D range extension
    Signal measurement