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13. Circuit Operating Description
13-1 Splitter (MOD101)
13-1-1 Function
Splitter receives the RF signal from antenna input at rear panel (ANT IN).
The received RF input signal split two ways by splitter for input of two tuners and RF out at rear panel. To boost
the divided RF signal, 5V is supplied.
13-1-2 Block Diagram
ANT IN
Booster
Splitter Tuner in
RF OUT
5V
Fig. 13-1
13-2 Tuner (TM101, TM102)
13-2-1 Function
It's consists of Tuning block and QAM-Demod block. Function of tuning block tunes the channel from 51 to
858MHz input RF signal and makes the IF (36.125MHz) which is sent QAM-Demod block.
Function of QAM-Demod block makes the MPEG-2 TS (Transport Stream) by QAM demodulation.
TS is consists of Data [0:7], Sync, Error, Valid and Clock signals.
Tuner is controlled by I2C.
Samsung Electronics 13-1
Circuit Operating Description
13-2-2 Block Diagram
RF Input
51~858MHz
ANT.IN H.P.F
LNA
RF AGC
AGC Rriver
ANT.OUT Snlliter
VHF RF AGC VHF
ATT
Trackine Filter AMP Trackine Filter
MOPLL SAW
UHF RF AGC UHF
Trackine Filter AMP Trackine Filter
IF AMP
IF AGC
Digital
Demodulator
I2C
TS
(Parallel)
Fig. 13-2
13-3 Main Processor (U302)
Main Processor is STi5100 which has functions as bellows.
13-3-1 Block diagram