The AD8367ARUZ is a High Performance 45dB VGA with AGC Detector and linear-in-dB gain control for use from low frequencies up to several hundred megahertz. The range, flatness and accuracy of the gain response are achieved using X-AMP? architecture, the most recent in a series of powerful proprietary concepts for variable gain applications, which far surpasses what can be achieved using competing techniques. The input is applied to a 9-stage, 200R resistive ladder network. Each stage has 5dB of loss, giving a total attenuation of 45dB. At maximum gain, the first tap is selected; at progressively lower gains, the tap moves smoothly and continuously toward higher attenuation values. The attenuator is followed by a 42.5dB fixed gain feedback amplifier, essentially an operational amplifier with a gain bandwidth product of 100GHz and is very linear, even at high frequencies. The AD8367 can be powered on or off by a voltage applied to the ENBL pin.
- 3dB Cut-off frequency of 500MHz
- Gain up and gain down modes
- Linear-in-dB, scaled 20mV/dB
- Resistive ground referenced input
- On-chip, square-law detector
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