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Raytheon - QAM IF Downconverter

Numéro de référence RC6508
Description QAM IF Downconverter
Fabricant Raytheon 
Logo Raytheon 





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RC6508 fiche technique
RC6508
QAM IF Downconverter
Electronics
Semiconductor Division
Features
• Integrated IF Down Converter
• IF bandwidth from 30 MHz to 80 MHz
• Operating range between 8.5V to 13.2V
• 63dB peak conversion gain from IF to baseband
• 40dB minimum AGC range
• Simple interface to SAW filter and A/D converter
• Gain control minimizes noise figure and distortion
• Tuner control feature interfaces with variety of tuners
• Industry standard 24 Lead SSOP package
Applications
• Digital Set-top Receivers
• Cable Modems
Description
The RC6508 simplifies the front-end design of cable modem
and set-top receivers. It is a cost-effective solution, since it
integrates IF amplifier, AGC, mixer, amplifier, tuner AGC,
VCO, XTAL OSC, and bandgap reference on a single chip.
The RC6508 downconverts the IF signal to baseband signal
for cable modem and set top receivers. The baseband signal
can be digitized and decoded with an external A/D converter
and a custom DSP demodulator. The input can directly inter-
face to a SAW filter and maintain a low noise figure. The gain
can be controlled over a 40dB range through an external
analog input signal. The gain reduction is done in two stages
with minimum noise figure and signal distortion. The IF out-
put is then down converted and filtered using a double bal-
anced mixer. The output can be further filtered with an
external filter prior to A/D conversion. The RC6508 has an
added feature that it provides an optimum tuner AGC control
voltage which is used to control the front end tuner gain.
The IF and Mixer section works at 9V and the oscillator
works on 5V supply. The RC6508 is available in a 24 Lead
SSOP package.
Block Diagram
VCC_HF
HFGND
IF_IN+
IF_IN–
IF_AGC
T_Strt
T_AGC
45dB
x2
+
VCC_RF (5V)
BB_GND
VCC_BB BB_Out
RF BB
LO
17dB
VCO
XTAL Osc
BANDGAP
REF
65-6508-01
Rev. 1.1.1

PagesPages 12
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