Audio Signaling Processor
Page 3 of 26
MX803A PRELIMINARY INFORMATION
1. Block Diagram
SIGNAL INPUT BIAS
DIGITAL
NOISE
FILTER 1
RX FILTER
SWITCH
(RX)
AUDIO IN
DIGITAL
NOISE
FILTER 2
COMMAND DATA
QUALITY
METER
PROGRAMMABLE
NOTONE
TIMER
REPLY DATA
GATE TIME
GENERATOR
C-BUS
INTERFACE
AND
CONTROL
LOGIC
CHIP SELECT
INTERRUPT
SERIAL CLOCK
LOGIC INPUT
FREQUENCY
COUNTER
V
DD
PROGRAMMABLE
(TX PERIOD)
TIMER
V
BIAS
TONE 1
GENERATOR
5-/2-TONE
DTMF 1
LOW
PASS
FILTER
TONE 1 OUT
SUM IN
SWITCHED SUM OUT
V
SS
_
V
BIAS
XTAL/
CLOCK
XTAL
AUDIO SWITCH IN
AUDIO
SWITCH
SUMMING
SWITCH
SUM OUT
CAL/CUES OUT
+
SUMMING
AMPLIFIER
CUES
CAL/CUES
SWITCH
CLOCK
GENERATOR
CAL
TONE 2
GENERATOR
CUES/DTMF 2
LOW
PASS
FILTER
TONE 2 OUT
SWITCH OUT
Figure 1: Block Diagram
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