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 amplifiers
    Video gain controls
    A/D range extensions
    Signal measurements