Only For Training And Service Purposes - LG GM210 Service Manual

Audio codec operating modes can be controlled by writing 5 bit codes in the AudMode field of the
AudControl1 register and in the AudMode_M field of the AudControl4 register. AudControl1 programs
the sampling rate and stereo or monophonic operating mode for PCM audio samples input via the
ASPORT.
AudControl4 programs the sampling rate and stereo or monophonic operating mode for PCM audio
samples input via the MSPORT.
The AudControl1 and AudControl4 contain control bits that allow system software to turn on three audio
loudness enhancement techniques meant for use when driving 8 ohm loudspeakers. These are high pass
filter, dynamic range compressor, and x4 gain boost. These loudness enhancement techniques can be
used with any AudMode or AudMode_M setting. And are programmed seperately and independently for
the ASPORT and MS- PORT PCM audio decoder data streams.
Analog Audio Output & Input Configurations
Output configurations are set by AudOS[4:0] bits in the AudControl2 register. Input configurations are set
by AudIS[3:0] bits in the AudControl2 register.
AudIn3LMute bit high in the AudMuteControl register (0x27 ). For configurations using "DAC2+AIN3R",
the AIN3R input may be muted by setting AudIn3RMute bit high in the AudMuteControl register. For
configurations using "AIN3(L)", the AIN3L and AIN3R inputs may be used as a differential input or the
AIN3L input may be used as a single-ended input.
Single ended configuration is chosen by setting AudIn3Cfg bit high in the AudControl3 register (0x32 ).
Audio DACs and Analog Filters
The Audio DACs are over-sampled switched-capacitor DACs. The analog filters are switched-capacitor
filters followed by active-RC filters.
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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3. TECHNICAL BRIEF
LGE Internal Use Only