MX465DS データシートの表示（PDF） - MX-COM Inc
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MX465DS Datasheet PDF : 17 Pages
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Low Voltage CTCSS Encoder/Decoder
Pin No.
Signal
16 TX TONE OUT
17 RX/TX
18 PTL
19 RX AUDIO OUT
20 TX AUDIO OUT
21 VBIAS
22 TX AUDIO IN
23 RX AUDIO IN
24 TONE INPUT
5
MX465
Type
output
input
input
output
output
output
input
input
input
Description
The CTCSS sinewave output appears on this pin under
control of the RX/TX pin. When not transmitting a tone,
TX TONE OUT may be biased to VDD/2. (see Table 3).
RX or TX modes selected in Parallel Mode (see Figure
4). In Serial Mode this function is serially loaded. This
pin is internally pulled to VDD via a 1M resistor.
In RX mode this pin operates as a ‘Push To Listen’
function by enabling the RX audio path, thus overriding
the tone squelch function (Parallel Mode). In Serial Mode
this function is loaded serially. Internal pull-up to VDD
High pass filtered RX AUDIO OUT. This pin outputs
audio when RX TONE DECODE = logic 0, PTL = logic 1,
or when Notone is programmed (see Table 4). In TX
mode this pin is biased to VDD/2.
High pass filtered TX AUDIO OUT pin. In TX mode this
pin outputs audio present at the TX AUDIO IN pin. In RX
mode this pin is biased to VDD/2
Output of an internally generated VDD /2 bias level that
would normally be externally bypassed to VSS via
capacitor C6.
In TX mode TX AUDIO IN may be prefiltered, using the
TX Audio path, thus helping to avoid talk-off due to
intermodulation of speech frequencies with the
transmitted CTCSS tone. Internally biased to VDD/2.
Input to the audio high pass filter in RX mode. Internally
biased to VDD/2.
Input to the CTCSS tone detector. Internally biased to
VDD/2.
Table 1: Signal List
©1998 MX•COM, INC.
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Doc. #20480143.008
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