LG HB620 Service Manual page 38

[Fig. 3.12] Integrated Tuner Block Diagram in DVB-H/T IC
■ Integrated Demodulator in DVB-H/T IC (SUB U104)
The DiB9080H performs all the processing from RF input signal to MPEG-TS outout (in DVB-T mode)
and MPE tables/sections output (in DVB-H mode). The COFDM demodulator embedded in DiB9080H
uses the state of the art Signal Processing to offer high performance for mobile, portable and fixed
reception of Digital Terrestrial Television signals compliant with EN 300.744 DVB-T and ETS 301.192
DVB-H standards. The integrated tuner uses direct conversion technology for low power consumption.
Dual AGC BB/RF is implemented in order to offer very high dynamic range control through digital. A
digital filter with high rejection capability is added to cope with adjacent channels. Combined with the
interpolation function it allows the circuit to demodulate 8, 7 or 5 MHz channels without changing the
analog front-end.
Host Interface offering: SRAM like Interface
The roles of DIB9080H in the DVB-H/T front-end are below :
- Tuner : DiB9080H controls
RF frequency, RF Gain, Base band Gain, Switch on and off
Monitor the Wide Band Detector in order to avoid the saturation of first amplification stage of the
tuner
- Application processor :
Data transfer(MPE tables, sections), Monitoring and configuration
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