Figure 2
Select
RF Input
RF Output
L64733/34 Simplified Block Diagram
L64733
RF
Switch
Synthesizer,
Mixer,
Down-
Converter
Baseband
Filter
Control Signals
Control
Modules for
Synthesizer
and Filter
IOUT
QOUT
L64734
Dual ADC
Demodulator
Host
Microcontroller
Microcontroller
Interface
Error
Correction
Descrambler
MPEG Output
The L64734:
•
generates control signals for the L64733 synthesizer, using
frequency information programmed into the L64734 configuration
registers
controls the programming of the low-pass filters on the L64733
generates dual AGC control voltages for the two-stage automatic
gain control on the L64733 IC.
•
•
The L64733 Tuner IC directly down-converts the satellite signal from
L-band to baseband.
2
L64733/L64734 Tuner and Satellite Receiver Chipset
LSI [ LSI COMPUTER SYSTEMS ]
