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參數(shù)資料
| 型號： | MX805LH |
| 英文描述： | RF/Baseband Circuit |
| 中文描述： | 射頻/基帶電路 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大小： | 532K |
| 代理商： | MX805LH |
Sub-Audio Signaling Processor
Page 9 of 24
MX805A
2001 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
All trademarks and service marks are held by their respective companies.
Doc. # 20480116.005
C9
D1
R3
100k
R9
R10
V
DD
R11
270k
D2
NOTE 6
(see p.4)
+
+
+
_
_
_
EXTERNAL
OP-AMP
MX805A
RX AMP
MX805A RX LPF
Gain = 6dB
D.C. RESTORATION
LEVEL SHIFT AND AMPLIFY
MX805A
COMPARATOR
COMPARATOR
OUT
COMPARATOR IN
RX AMP IN
13
FROM RX
DISCRIMINATOR
19
20
14
21
17
16
15
15 F
Figure 4: MX805A Input Components using and External Op-Amp
4 General Description
4.1 Glossary
DCS
CTCSS
DPL
TM
LTR
TM
NRZ
f
CO
f
CTCSS
IN
f
CTCSS
OUT
f
TONE
f
XTAL
R
NRZRX
R
NRZTX
s
INPUT
Continuous Digitally Coded Squelch
Continuous Tone Controlled Sub-Audio Squelch
Digital Private Line
Logic Trunked Radio
Non-Return-to-Zero
Filter Cutoff frequency
Sub-Audio Rx frequency
Sub-Audio Tx frequency
Tone frequency
Xtal/Clock frequency
NRZ RX baud rate
NRZ TX baud rate
Audio input signal.
4.2 Operating Modes
4.2.1
NRZ Encoding
The NRZ Encoder is formed by a shift register and the TX Sub-Audio Lowpass Filter. Data loaded from the
Command Data line is output one 8-bit byte at a time from the NRZ Tx Data Register. The output data level
may be adjusted and filtered. Data may be pre-emphasized via a C-BUS command. The expected Rx baud
rate is programmed as the NRZ Tx Baud Rate (R
NRZTX
). See Table 8
4.2.2
CTCSS Encoding
The CTCSS Tone Encoder is comprised of a clock divider programmed by an 11-bit binary number (Q)
loaded to the CTCSS Tx Frequency Register (See Table 8) via the C-BUS Command Data line.
The square-wave output of the encoder is fed through the Tx Level Adjust variable gain block to the Tx
Sub-Audio lowpass filter, a variable gain bandwidth circuit controlled by 4-bits (P) if the CTCSS Tx Frequency
Register. The Tx Sub-Audio output is a sine-wave. Standard and nonstandard sub-audio tones are available.
A CDCS turnoff tone may also be generated.
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