CMX838 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX838' PDF : 71 Pages View PDF
FRS/PMR446/GMRS Family Radio Processor
CMX838
Examples of ‘CTCSS tone decoder’, ‘CTCSS tone encoder’ and ‘internal audio encoder’ paths are illustrated
in Figure 32, Figure 33, and Figure 34.
AUX I/O 2
audio call
tone output
from the
discriminator
RXIN
1
BPF
LPF
CTCSS encode
audio tone encode
1
0
CTCSS decoders
voltage
ref
Decoder
Activated
Tone (Hz) List
67.0
YES
69.3
NO
71.9
NO
74.4
YES
77.0
NO
79.7
YES
...
...
225.7 YES
233.6
NO
241.8 YES
250.3 YES
Figure 32: Example CTCSS Tone Decoder Path
subaudio
output
Vbias
AUX I/O 2
from the
discriminator
RXIN 1
audio call
tone output
BPF
LPF
CTCSS encode
audio tone encode
1
0
CTCSS decoders
voltage
ref
subaudio
output
Vbias
Figure 33: Example CTCSS Tone Encoder Path
2003 CML Microsystems Plc
51
D/838/8
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