Sub-Audio Signaling Processor
Page 4 of 24
MX805A
1 Block Diagram
RX LPF
RX SUB-AUDIO
IN
180Hz/260Hz
RX SUB-AUDIO
OUT
COMPARATOR
IN
+
_
OUT
DIGITAL
NOISE
FILTER
FREQUENCY
ASSESMENT
NOTONE
TIMER
NOTONE
COMPARATOR
AMP
RAW NRZ DATA
NRZ RX
DATA AND
BAUD RATE
EXTRACTOR
AMP OUT
+
COMMAND DATA
REPLY DATA
FREQUENCY
MEASUREMENT
C-BUS
INTERFACE
AND
CONTROL
LOGIC
AMP IN
_
CHIP SELECT
INTERRUPT
SERIAL CLOCK
WAKE
ADDRESS SELECT
RX AMP
V
DD
V
BIAS
XTAL/
CLOCK
CLOCK
GENERATOR
XTAL
NRZ
RX DATA
RX
TX
NRZ RX
BAUD RATE
DATA BUFFER
AND
SHIFT REGISTER
NRZ
TX DATA
VARIABLE
BANDWIDTH
CTCSS SUB-
AUDIO FREQUENCY
SUB-AUDIO BANDSTOP
V
SS
AUDIO IN
AUDIO SIGNAL PATH
TX LEVEL
ADJUST
TX SUB-AUDIO LPF
TX SUB-AUDIO
OUT
AUDIO OUT
AUDIO BYPASS
Figure 1: Block Diagram
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4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
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Doc. # 20480116.005
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