PvtSQUELCHTM CTCSS Encoder/Decoder
3
MX375
1. Block Diagram
Filter
Output
Balanced
Modulator
Input
TX
CLR
TX
TX Audio Output
6dB/Octave
TX Audio
Input
-6dB/Octave
RX
fEMPH
BIAS
RX
fEMPH
BIAS
fCLK1
fCLK2
fCARRIER
PVT
TX
RX Audio
Input
RX Audio Output
Reference
Hysteresis
3333Hz
Filters
XTAL
XTAL
RX Tone Decoder Output
Decode Comparator Input
Clocks
RX Tone Detect Output
RX Tone Input
Load/Latch
CTCSS
Tone Detect
3333 Hz
D5 or Serial Enable 1
D4 or Serial Enable 2
D3 or Serial Data Input
D2 or Serial Clock Input
TX Tone
Output
8-Bit
Shift
Register
and
LD5-LD0
Control
NoTone Output
VDD
fCARRIER
Logic
D1 Input
D0 Input
fCLK1
fCLK2
Latches
fEMPH
RX/TX
Control
RX Path
TX Path
Private
VBIAS
VSS
Private Enable
Push-To-Listen
PTL
Figure 1: Device Block Diagram
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480026.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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