LG -A290 Service Manual page 52

3. TECHNICAL BRIEF
Figure 3.13.2 Block diagram of digital circuit of audio front end
To communicate with the external Bluetooth module, the master-mode PCM interface and master-mode IS/EIAJ
interface are supported. The clock of PCM interface is 56 kHz while the frame sync is 8 kHz. Both long sync and short
sync interfaces are supported. The PCM interface can transmit 16-bit stereo or 3-bit mono 8 kHz sampling rate voice
signal. Figure 3.13.3 shows the timing diagram of the PCM interface. Note that the serial data changes when the clock is
rising and is latched when the clock is falling.
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