Audio Interface - LG U990 Service Manual

3. TECHNICAL BRIEF

3.12.6 Audio Interface

In this configuration ZR3453X is connected to an external audio codec.
There are three possible configurations:
• Audio/Voice codec with two ports: PCM and I2S
• Audio/Voice codec with one port: I2S
• Audio/voice/data codec with one port: AC97
In all configurations ZR3453X connects its external audio ports to the codec single or two
ports.
The host uses its internal voice codec for voice communication. There is no bypass of voice.
The host controls the codec configuration via I2C bus directly. The host codec analog audio output is
connected to the external audio codec and muxed with the codec audio path from the ZR3453X on the
way is to the speaker.
The microphone is connected to the external audio codec and the baseband internal codec.
ZR3453X appears in Figure 3-35 as a master on the bit clock and frame sync. This is only one of the
possible configurations. In external audio configuration ZR3453X can run all the Audio/voice
applications including conversation recording .
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