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RC2798G
Integrated QAM IF downconverter
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
Applications Digital Set-top receivers Cable modems Internet surfboards Network Interface Modules Multimedia PCs
DescriptionThe RC2798 is an integrated solution for the down-
conversion 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 . The video amplifier works at 5V to 10V. The RC2798 is
available in a 20 Lead TSSOP package.
