The AD8368 is a variable gain amplifier (VGA) with analog linear-in-dB gain control that can be used from low frequencies to 800 MHz. Its excellent gain range, conformance, and flatness are attributed to the X-AMP® architecture, an innovative technique for implementing high performance variable gain control.
The gain range of -12 dB to +22 dB is scaled accurately to 37.5 dB/V with excellent conformance error. The AD8368 has a 3 dB bandwidth of 800 MHz that is nominally independent of gain setting.
The gain of the AD8368 can be configured to be an increasing or decreasing function of the gain control voltage depending on whether the MODE pin is pulled to the positive supply or to ground, respectively. When MODE is pulled high, the AD8368 operates as a typical VGA with increasing gain.
The AD8368 operates from a supply voltage of 4.5 V to 5.5 V and consumes 60 mA of current. It can be fully powered down to <3 mA by grounding the ENBL pin.
- Analog variable gain
- Integrated rms detector
- 50 ohm input and output impedances
- Single-supply voltage from 4.5 V to 5.5 V
- RoHS-compliant
- Applications:
- Complete IF AGC amplifiers
- Gain trimming and leveling
- Cellular base stations
- Point-to-point radio links
- RF instrumentation
