Product Description
The RF3321 is a variable gain amplifier for use in CATV reverse path (upstream) applications. It is designed to be DOCSIS-compliant for use in cable modems. The gain control covers a 56dB range and is serially programmable via three-wire digital bus for compatibility with standard baseband chipsets. Amplifier shutdown and transmit disable modes are hardware-controlled. The device operates over the frequency band of 5MHz to 65MHz for use in current U.S. and European systems. The amplifier delivers up to +69dBmV at the output of the balun. Gain is controllable in accurate 1dB steps. The device is provided in a thermally enhanced, exposed die flag package.

Features
• Differential Input and Output
• 31dB Maximum Voltage Gain
• -25dB Minimum Voltage Gain
• 5MHz to 65MHz Operation
• Sophisticated Power Management
• DOCSIS 1.1 RF Compliant

Typical Applications
• Euro-DOCSIS/DOCSIS Cable Modems
• CATV Set-Top Boxes
• Telephony Over Cable
• Home Networks
• Automotive/Mobile Multimedia
• Coaxial and Twisted Pair Line Driver