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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 

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