LG LG-P970 - Page 84

3. TECHNICAL BRIEF
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• Additional features
– Headset detect capability (GPIO)
– Digital microphone inputs (four microphone inputs, two clocks, and two supplies for two external
digital microphones). Supplies are the microphone biases referred to in the previous sublist.
Data and clock are multiplexed on the PCM port.
– Pop-noise reduction circuitry for all paths
– Side-tone function for the voice paths
– Data scramble function for I2S data received
– Bass boost functions in one stereo audio RX path
– Automatic gain control on the microphone paths
– Independent gains on UL paths
– Programmable gain amplifier on audio RX and TX
– Wide gain programmable range on the microphone input
– DTMF tone generator
Figure . Device Audio Subsystem Architectural Overview
Device�- Audio
Two
ADCs
Digital�mixing
volume�control
filters
Four
ADCs
Digital�mixing
volume�control
filters
Audio
TDM/I2S
serial
port
interface
PCM
voice
serial
port
Voice
DAC
BT
voice
serial
port
Analog
mixing
Analog
volume
control
Analog
drivers
Programmable
analog�amplifiers�for
the�microphones
Digital
microphones
interface
Voice�and�Bluetooth�paths
Audio�and�voice�mixer�and�drivers
Input�interfaces
Audio�Rx/Tx�and�voice Tx
audio-004
TI Confidential — NDA Restrictions
www.ti.com Functional Description
• The analog input connected to the analog auxiliary input and the microphones
NOTE: The modem or the OMAP device Bluetooth, voice, and audio interfaces must use
the same clock provider as the device.
Figure 14-4 is an architecture overview of the audio subsystem.
Figure 14-4. Device Audio Subsystem Architectural Overview
14.4.1 Data Paths
After the audio submodule is powered up (by the CODECPDZ bit of the CODEC_MODE register, see
Table 14-19), it has two modes of operation:
• Option 1: Four simultaneous multimedia analog channels (four multimedia digital-to-analog converters
(DACs) and no modem voice path), and two simultaneous analog-to-digital converters or 4 channels
coming from digital microphones.
• Option 2: A dedicated modem voice path (two multimedia DACs plus the ADC/DAC pair used for the
voice mode).
Selection of option 1 or 2 is configurable through the OPT_MODE bit of the CODEC_MODE register.
Table 14-10 lists operations for options 1 and 2.
667
SWCU051F– March 2008 – Revised July 2010 Audio
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