MX375LH Просмотр технического описания (PDF) - MX-COM Inc
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MX375LH Datasheet PDF : 15 Pages
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PvtSQUELCHTM CTCSS Encoder/Decoder
7
MX375
4. General Description
4.1.1 Pre- and De-emphasis
Pre- and De-emphasis (6dB/octave) filters are included on-chip in the transmit path, so that the use of this device will
produce natural sounding audio (clear or private modes) when installed in modern radio communication transceivers, with
or without existing audio processing circuitry. The recommended layout is shown in block form below.
Amplifier
Pre-emphasis
Band Pass
Filter
Clear
Band Pass
Filter
De-emphasis Pre-emphasis
To Transmitter
Stages
Modulator
From Receiver
Stages
Demodulator
Band Pass
Filter
Clear
Band Pass
Filter
De-emphasis
Amplifier
Figure 3: Transmit and Receive Paths
4.1.2 Functions and Outputs
D0-D5
Tone
Tone
Notone
Tone
Tone
Tone
Notone
Tone
Tone
Notone
Tone
Tone
Tone
Notone
Notone RX/TX
1
0
1
0
0
0
1
1
1
1
1
1
0
1
1
0
1
0
0
0
1
1
1
1
1
1
0
1
PRIVATE
ENABLE
0
0
0
0
0
0
0
1
1
1
1
1
1
1
PTL RX TONE
DETECT
1
0
0
0
X
0
1
0
0
0
X
1
X
X
1
0
0
0
X
0
1
0
0
0
X
1
X
X
RX TONE
DECODER
1
1
1
1
1
0
0
1
1
1
1
1
0
0
TONE
OUTPUT
YES
YES
BIAS
BIAS
BIAS
BIAS
BIAS
YES
YES
BIAS
BIAS
BIAS
BIAS
BIAS
TONE
PHASE
0°
180°
X
X
X
X
X
0°
180°
X
X
X
X
X
TX
PATH
OPEN
OPEN
OPEN
BIAS
BIAS
BIAS
BIAS
OPEN
OPEN
OPEN
BIAS
BIAS
BIAS
BIAS
Table 3: Functions and Outputs
RX
PATH
BIAS
BIAS
BIAS
BIAS
OPEN
OPEN
OPEN
BIAS
BIAS
BIAS
BIAS
OPEN
OPEN
OPEN
PATH
STATE
INV
INV
CLR
X
CLR
INV
CLR
CLR
CLR
CLR
X
CLR
CLR
CLR
TONE
TX, TONE
TX, TONE REV
TX, NOTONE
INCOMPATIBLE
INCOMPATIBLE
COMPATIBLE
RX, NOTONE
TX, TONE
TX, TONE REV
TX, NOTONE
INCOMPATIBLE
INCOMPATIBLE
COMPATIBLE
RX, NOTONE
Note:
1. Algebraic functions:
RX Path On = RX × (PTL + RX Tone Decoder)
Clear Path = Notone + Private Enable + (PTL × RX × RX Tone Decoder)
Notone (D0 - D5) = 000011
Carrier Frequency = 3333Hz During inverted Path (TX or RX)
2. The Pre- and De-emphasis circuits remain in the transmit path in both the Clear and Invert Modes.
3. Power remains applied to the CTCSS tone decoder at all times.
4. During clear operation the carrier frequency is turned off to reduce spurious emissions.
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480026.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
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