FX465 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
Manufacturer
FX465 Datasheet PDF : 9 Pages
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CML Semiconductor Products
PRODUCT INFORMATION
FX465 Extended Code CTCSS
Encoder/Decoder
Features
Low-Voltage (3-Volt) Supply
47 Programmable Sub-Audio
Tones + NOTONE
Meets MPT1306 and TIA/EIA 603
High Voiceband/CTCSS Isolation
Separate Sub-Audio and Rx/Tx
Audio Paths and Filtering
Publication D/465/2 May 1996
Applications
Advance Information
Mobile Radio Systems
Community Base Stations
“Sports Radio” (Japan)
Sub-Audio Signalling and
Selective Calling
Status and Alarm Systems
Amateur Radio
TONE IN
TONE IN
FILTER
f TONE
LOAD/LATCH
D5/SERIAL ENABLE
D4/SERIAL ENABLE
D3/SERIAL DATA IN
D2/SERIAL CLOCK
D1
D0
RX/TX
PTL
XTAL/CLOCK
XTAL
+
-
CLKS
DIGITAL
INTERFACE
AND
CLOCK
GENERATION
TONE DECODE
FILTER
CLKS
REFERENCE
VOLTAGE
-
+
CLKS/XTAL
CLKS/XTAL
TONE DETECT
LOGIC
TONE OUT FILTER
Rx TONE DETECT
Tx TONE OUT
A0 - A5
D0 - D10
TONE
ROM
48 x 10
VDD
VSS
VBIAS
FX465
CLK
TX AUDIO IN
Tx AUDIO OUT
RX AUDIO IN
DECODE COMPARATOR REF
DECODE COMPARATOR IN
Fig.1 Functional Block Diagram
AUDIO FILTER
+
-
Brief Description
The FX465 is a 3-volt, half-duplex predictive
Continuous Tone Controlled Squelch System (CTCSS)
encoder/decoder microcircuit. The FX465 has integral
voice-band filtering for prefiltering of Tx audio and the
rejection of the CTCSS tone in receive.
Under µProcessor control, the FX465 will encode
and decode any one of 47 sub-audio frequencies
(+NOTONE) in the range 67.0Hz to 254.1Hz. Tone
frequencies and all functional commands can be
loaded to the device in either pin-selectable 8-bit
parallel or serial format.
A separate, Rx/Tx voice-audio path is available with
a highpass (sub-audio reject) filter automatically placed
in the relevant Rx or Tx voice line.
Rx AUDIO OUT
Rx TONE DECODE
New SSOP D5
package
The Rx sub-audio (CTCSS) path contains a
(selected tone frequency) bandpass filter and period
detector providing a logic level output (Rx Tone Detect)
to indicate a successful decode operation.
Rx “Press to Listen” (PTL) and Tx “Squelch-Tail
Elimination” functions are available in both command
loading modes. The squelch-tail elimination function
will provide (Tx tone) phase-reversal to minimise the
annoying audio outputs that occur at the receiver on
completion of a transmission.
Tone frequencies and filter accuracies are
maintained by an on-chip 4.0MHz clock oscillator
employing an external crystal or clock pulse input.
The FX465, which exhibits high audio and sub-audio
performance with low falsing, is available in a 24-pin
plastic small outline SSOP package.
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