SYSTEM CONNECTOR INTERFACE
34
LZT 123 8020 R1A
5.8 PCM Digital Audio
Pin Signal
Dir Function
52
PCMCLK
O
PCM clock
51
PCMSYNC
O
PCM frame sync
47
PCMULD
I
PCM audio input to DSP
48
PCMDLD
O
PCM audio output from DSP
50
PCMIN
I
PCM audio input to Codec
49
PCMOUT
O
PCM audio output to Codec
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.
!
"#$%
&' !!
Figure 5.6 Pin connections to digital audio
Note!
When no external audio processing is performed, the following
pins must be connected together:
•
PCMDLD to PCMIN
•
PCMULD to PCMOUT
Electrical characteristics
Digital 2.75 V CMOS input/output electrical characteristics
apply.
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