DATA BULLETIN
MX165C
Features
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Meets TIA/EIA-603 Standards
47 CTCSS Tones + Notone
TX/RX Speech Filters
Improved Sinad
Serial or Parallel Programming
Easy µP Interface
Scanning on any Channel
Standard 1MHz Xtal
(See MX465 for 4MHz)
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Low Voltage 3.3V to 5.0V
TONE IN
FILTER
Low Voltage
CTCSS Encoder/Decoder
with TX/RX Filters
Applications
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Mobile Radio Channel Sharing
Scan Trunking
Wireless Intercom Traffic Control
Hookswitch Supervision
Repeater Control
TONE DECODE
FILTER
REFERENCE
VOLTAGE
TONE IN
f TONE
CLKS
CLKS
LOAD/LATCH
D5/SERIAL ENABLE 1
D4/SERIAL ENABLE 2
D3/SERIAL DATA IN
D2/SERIAL CLOCK
D1
D0
RX/TX
PTL
XTAL/CLK
XTAL
DIGITAL
INTERFACE
AND
CLOCK
GENERATION
CLKS/XTAL
TONE DETECT
LOGIC
TONE OUT FILTER
CLKS/XTAL
A0-A5
D0-D10
TONE
ROM
48 x 10
TX AUDIO IN
CLK
RX AUDIO IN
300Hz
AUDIO FILTER
DECODE COMPARATOR REF.
DECODE COMPARATOR IN
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The MX165C CTCSS Encoder/Decoder is a low voltage, CMOS device that meets TIA/EIA-603 Standards. The MX165C
will encode and decode the tones 159.8Hz, 183.5Hz, 189.9Hz, 196.6Hz, 199.5Hz, 206.5Hz, 229.1Hz, and 254.1Hz in
addition to the 39 standard CTCSS tones, for a total of 47 CTCSS tones + Notone. With the incorporation of the on-chip
TX and RX speech filter, the MX165C enhances voice/tone multiplexing by attenuating TX and RX speech 36dB at
frequencies below 250Hz while passing signals > 300Hz with only 1dB of ripple. This not only minimizes CTCSS talk-off
in the TX mode but also improves Hum and Noise performance in the RX mode.
Available in the following package styles: 24-pin TSSOP (MX165CTN), 24-pin SOIC (MX165CDW), 24-pin PLCC
(MX165CLH), and 24-pin PDIP (MX165CP), the MX165C requires a single 3.3V to 5.0V supply and a 1MHz clock or
crystal.
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050
Fax: 910 744-5054
Doc. # 20480102.008
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
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RX TONE DETECT
TX TONE OUT
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V
DD
V
SS
V
BIAS
TX AUDIO OUT
RX AUDIO OUT
RX TONE DECODE
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