CML Microcircuits
COMMUNICA
TION SEMICONDUCTORS
D/808A/6
September 2003
CMX808A
Family Radio CTCSS ‘Type 2’
Encoder and Decoder
1.0
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Features
Unique CTCSS ‘Type 2’ Operation
Fast Decode on all Tones (140ms)
Tones from 60Hz to 251Hz
Tone Cloning
Low Power Operation (1.3mA at 3.0V)
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High Performance Encode/Decode
Flexible Multiple Decode Options
Sub-Audio Tone Rejection Filter
48 Programmable CTCSS Tones
Compact 20-pin TSSOP Package
Applications
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Family Radio Service
(FRS) Handportables
Amateur Radio
Equipment
General Mobile Radio
Service (GMRS)
Short Range
Business Radio
1.1
Brief Description
This device is a unique product for the designer of family radio transceivers. Offering leading edge
performance while also being highly cost effective. The device is simple to interface to a host of
µControllers via the serial programming interface. A full range of 48 tones can be generated and detected
by the device. The decode time has been vastly improved from that offered by other solutions. Fast
response and de-response gives the user of a family radio transceiver faster switching times and a
reduction in the annoying squelch tail often found in CTCSS based systems. The device has very low
power consumption operating at a minimum of 3.0V.
A unique feature of the device is its ability to look for 7 different CTCSS codes simultaneously. This allows
FRS designers to offer equipment which can look for personal, family or open channel codes at the same
time. For example a soccer team coach can call each of the 11 players individually or the team as a
group. Codes can be used as Paging codes, open chat mode codes as well as personal and family
codes. These features allow FRS designers to differentiate their products from that of the competition in
unique ways to gain market share in this highly competitive application. The CMX808A opens the way to
rapid development of new family radio applications.
2003 CML Microsystems Plc
CMLMICRO [ CML MICROCIRCUITS ]
