MX375 Просмотр технического описания (PDF) - CML Microsystems Plc
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MX375 Datasheet PDF : 16 Pages
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PvtSQUELCHTM CTCSS Encoder/Decoder
5
MX375
Pin No.
LH J,P,LH8
13
16
14
17
15
18
16
19
17
20
18
21
19
22
20
23
21
24
22
25
23
26
24
27
Name
VBIAS
FILTER
OUTPUT
BALANCED
MODULATOR
INPUT
RX AUDIO
OUTPUT
TX AUDIO
OUTPUT
RX AUDIO
INPUT
TX AUDIO
INPUT
PTL
CONTROL
RX/ TX
PRIVATE
ENABLE
RX TONE
INPUT
Type
Description
output
input
This pin is set internally to VDD/2. It must be externally decoupled using a
capacitor (C7) to VSS. See Figure 2.
This is the output of the Input Audio Bandpass Filter. It must be A.C.
coupled to the Balanced Modulator Input via capacitor C4. See Figure 2.
This is the input to the balanced modulator. Must be A.C. coupled to the
Filter Output via capacitor C4. See Figure 2.
output
output
Outputs the received audio from a buffered output stage and is held at
VBIAS when in TX.
Outputs the transmitted audio in TX. In RX, this pin is held at VBIAS.
input
input
input
input
input
The audio input for the RX mode. Input signals should be AC coupled via
external capacitor C6. See Figure 2
This is the TX Audio voice input. Signals should be AC coupled via
external capacitor C11. See Figure 2
The “press to listen” function input. In RX mode, a logic “0” enables the
RX Audio Output directly, overriding tone squelch but not intercepting a
private conversation; in TX mode, a logic “0” reverses the phase of the TX
Tone Output for “squelch tail” reduction (see Table 5).
This input, together with Load/ Latch , selects the operational mode of the
RX/ TX and PrivateEnable functions. See Table 5
This input selects the RX or TX mode (RX = 1, TX = 0). This can be
loaded in Serial or Parallel modes as described in Table 5
This input selects either Private or Clear mode (Clear = 1, Private = 0),
and can be loaded by Serial or Parallel modes as described in Table 5.
This input has an internal 1 MΩ pullup resistor.
This is the received audio input to the on-chip CTCSS tone decoder. It
should be A.C. coupled via capacitor C5.
Note: The MX375LH package is available in serial mode only.
Table 1: Signal List
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480026.007
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