Sub-Audio Signaling Processor
Page 4 of 24
MX805A
1 Block Diagram
RX SUB-AUDIO
OUT
COMPARATOR
OUT
RX LPF
IN
RX SUB-AUDIO
IN
+
_
DIGITAL
NOISE
FILTER
NOTONE
FREQUENCY
ASSESMENT
NOTONE
TIMER
180Hz/260Hz
AMP OUT
COMPARATOR
AMP
COMMAND DATA
RAW NRZ DATA
REPLY DATA
NRZ RX
DATA AND
BAUD RATE
EXTRACTOR
+
C-BUS
CHIP SELECT
INTERRUPT
AMP IN
INTERFACE
FREQUENCY
MEASUREMENT
_
AND
RX AMP
NRZ RX
NRZ
RX DATA
BAUD RATE
SERIAL CLOCK
WAKE
CONTROL
LOGIC
VDD
RX
TX
VBIAS
ADDRESS SELECT
NRZ
TX DATA
XTAL/
DATA BUFFER
AND
SHIFT REGISTER
CLOCK
VARIABLE
BANDWIDTH
CLOCK
GENERATOR
TX SUB-AUDIO
OUT
CTCSS SUB-
XTAL
VSS
AUDIO FREQUENCY
TX LEVEL
ADJUST
SUB-AUDIO BANDSTOP
TX SUB-AUDIO LPF
AUDIO OUT
AUDIO IN
AUDIO SIGNAL PATH
AUDIO BYPASS
Figure 1: Block Diagram
ã2001 MX-COM, Inc.
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Doc. # 20480116.006
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