VESTEL MB120 DS, Service Manual

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General Description
The MSB1246 is a single chip demodulator supporting DVB-T2, DVB-T, DVB-C, DVB-S2 and DVB-S
standards. The device integrates a house keeping microcontroller that takes care of all real time and algorithmic
tasks simplifying the host control interface.
For DVB-T2/T/C, the MSB1246 front end can accept tuners that provide IF or low IF output. For DVB-
S2/S, the MSB1246 front end can accept tuners that provide zero-IF output. A high rejection channel filter has
been included easing the channel filtering requirement of the tuner whilst still meeting the stringent
requirements for adjacent channel interference. The MSB1246 may be clocked directly using a crystal, typically
24MHz.
The MSB1246 is capable of blind acquisition of DVB-T/T2, DVB-C and DVB-S2/S signals. All parameters
may be detected in this mode enabling fast and accurate auto scanning. Its frequency recovery circuit is able to
compensate for all typical tuner and broadcast frequency errors.
Block Diagram