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5.8 PCM Digital Audio
Electrical characteristics
LZT 123 7589 R1A
5. SYSTEM CONNECTOR INTERFACE
Pin
Signal
52
PCMCLK
51
PCMSYNC
47
PCMULD
48
PCMDLD
50
PCMIN
49
PCMOUT
Figure 5.6 shows the PCM (Pulse Code Modulation) digital audio
connection for external devices. These connections can be used to process
PCM digital audio signals, bypassing the radio device's internal analogue
audio CODEC.
PCMSYNC & PCMCLK
PCMDLD
DSP
PCMULD
Link for internal
digital-audio processing
Figure 5.6 Pin connections to digital audio
When no external audio processing is performed, the following pins must
be connected together:
• PCMDLD to PCMIN
• PCMULD to PCMOUT
Digital 2.75 V CMOS input/output electrical characteristics apply.
Dir
Function
O
PCM clock
O
PCM frame sync
I
PCM audio input to DSP
O
PCM audio output from DSP
I
PCM audio input to Codec
O
PCM audio output to Codec
GR47
PCMIN
PCMOUT
System connector
CODEC
Analogue
audio
signals
33
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