MX165C Просмотр технического описания (PDF) - MX-COM Inc
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MX165C Datasheet PDF : 15 Pages
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Low Voltage CTCSS Encoder/Decoder
Pin No.
18 PTL
Signal
19 RX AUDIO OUT
20 TX AUDIO OUT
21 VBIAS
22 TX AUDIO IN
23 RX AUDIO IN
24 TONE INPUT
5
MX165C
Type
input
output
output
output
input
input
input
Description
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
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480102.008
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