LG GB175, Service Manual, Page: 32 / 158

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3.6 FM Radio Module (Si4708)
Figure. 3-6-1 Si4708 FM Receiver Block Diagram
The Si4708/09 extends Silicon Laboratories Si4700 FM tuner family, and further increases the
ease and attractiveness of adding FM radio reception to mobile devices through small size and
board area, minimum component count, flexible programmability, and superior, proven
performance. Si4708/09 software is backwards compatible to existing Si4700/01/02/03 FM
Tuner designs and leverages Silicon Laboratories' highly successful and patented
Si4700/01/02/03 FM tuner. The Si4708/09 benefits from proven digital integration and 100%
CMOS process technology, resulting in a completely integrated solution. It is the industry's
smallest footprint FM tuner IC requiring only 6.25 mm2 board space and one external bypass
capacitor.
The device offers significant programmability, catering to the subjective nature of FM listeners’
audio preferences and variable FM broadcast environments worldwide.
The Si4709 incorporates a digital processor for the European Radio Data System (RDS) and
the US Radio Broadcast Data System (RBDS) including all required symbol decoding, block
synchronization, error detection, and error correction functions.
RDS/RDBS* enables data such as station identification and song name to be displayed to the
user. The Si4709 offers a detailed RDS view and a standard view, allowing adopters to
selectively choose granularity of software is backwards compatible to the proven Si4701/03,
adopted by leading cell-phone and MP3 manufacturers world-wide.
The Si4708/09 is based on the superior, proven performance of Silicon Laboratories' Aero
architecture offering unmatched interference rejection and leading sensitivity. The device uses
the same programming interface as the Si4700/01/02/03 and supports multiple bus modes.
Power management is simplified with an integrated regulator allowing direct connection to a 2.7
to 5.5 V battery for VD and 2.7 to 5.5 V battery for VA.
The Si4708/09 device’s high level of integration and complete FM system production testing
increases quality to manufacturers, improves device yields, and simplifies device manufacturing
and final testing.