Fm Interface - LG KG195 Service Manual

4. Circuit Description

4.2.17 FM interface

MT6226 integrates a mixed-signal Baseband front-end in order to provide a well-organized radio
interface with flexibility for efficient customization. It contains gain and offset calibration mechanisms,
and filters with programmable coefficients for comprehensive compatibility control on RF modules. This
approach also allows the usage of a high resolution D/A Converter for controlling VCXO or crystal, thus
reducing the need for expensive TCVCXO.
MT6226 achieves great MODEM performance by utilizing 14-bit high resolution A/D Converter in the
RF downlink path.
Furthermore, to reduce the need for extra external current-driving component, the driving strength of
some BPI outputs is designed to be configurable.
LGE Internal Use Only
Figure 7. Si4703 FM Receiver Block Diagram
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