RC2798中文资料Integrated QAM IF Downconverter数据手册ONSEMI规格书

描述 Description

The RC2798 is an integrated solution for the downconversion of QAM IF signals in the front-end design of cable modem and set-top receivers. It is intended for use in 64QAM and 256QAM IF downconversion applications.The RC2798 integrates IF amplifier with AGC , mixer, VCO,and a video amplifier on a single chip. It accepts the QAM IF signals via SAW filter and downconverts it to 5MHz baseband signal.

The baseband signal can be digitized using Fairchild Semiconductor’s 8 bit A/D (TMC1175 series) or 10bit A/D (TMC1185 series) and decoded further with a QAM demodulator. The IF, Oscillator and Mixer section work at 5V. The video amplifier works at 5V to 10V. The RC2798 is available in a 20 Lead TSSOP package.

特性 Features

• RF input frequency range 30 to 250MHz
• On chip VCO with LO frequency range 30 to 250MHz
• IF amplifier with AGC setting
• High dynamic range -9dBm IIP3
• On chip Video Amplifier
• Built in ESD protection
• Supply voltage range 5 to 10 V
• Space saving 20-Lead TSSOP package

应用 Application

• Digital Set-top receivers
• Cable modems
• Internet surfboards
• Network Interface Modules
• Multimedia PCs