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DB929B bảng dữ liệu(PDF) 41 Page - CML Microcircuits

tên linh kiện DB929B
Giải thích chi tiết về linh kiện  Full Data Packet Framing
PDF  51 Pages
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nhà sản xuất  CMLMICRO [CML Microcircuits]
Trang chủ  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

DB929B bảng dữ liệu(HTML) 41 Page - CML Microcircuits

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4-Level FSK Modem Data Pump
Page 41 of 50
MX929B PRELIMINARY INFORMATION
©2001 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 336 744 5050
Fax: 336 744 5054
Doc. # 20480171.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
2. Any AC coupling at the receive input will transform any step in the voltage at the discriminator output to a
slowly decaying pulse which can confuse the modem's level measuring circuits. As illustrated in Figure 25
below, the time for this step to decay to 37% of its original value is 'RC' where:
network)
RC
the
of
frequency
off
-
cut
(3dB
2
1
=
RC
5
which is 32ms, or 153 symbol times at 4800 symbols/sec (9600bps) for a 5Hz network.
37%
T = RC
100%
Step Input
to RC Circuit
Output of
RC Circuit
Figure 25: Decay Time - AC Coupling
In general, it is best to DC couple the receiver discriminator to the modem and ensure that any AC coupling to
the transmitter's frequency modulator has a -3dB cut-off frequency of no higher than 5Hz for 4800
symbols/sec (9600bps).



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