MX604 데이터 시트보기 (PDF) - MX-COM Inc
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MX604 Datasheet PDF : 17 Pages
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v.23 Compatible Modem
11
MX604 PRELIMINARY INFORMATION
If the data retiming facility is not required, then the CLK input to the MX604 should be kept high at all times.
The asynchronous data to the FSK modulator will then be connected directly to the TXD input pin. This is
illustrated in Figure 10 and will also be the case when transmitting 75bps data which has no retime option.
TXD input :
FSK Modulator input :
N-2 N-1 N N+1 N+2
N-2 N-1 N N+1 N+2
Figure 10: FSK Operation without Tx Data Re-timing (CLK always high)
5. Application
5.1 Line Interface
The signals on the telephone line are not suitable for direct connection to the MX604. A Line Interface circuit
is necessary to:
Provide high voltage and dc isolation
Attenuate the Tx signal present at the Rx input
Provide the low impedance drive necessary for the line
Filter the Tx and Rx signals
+
C5
LINE
1:1
0V
C
Z
R4
B
A1
R5
C7
R6
A2
R2
C6
R3
R2
R3
R4-R7
See Notes
See Notes
100k
1%,
1%,
1%,
C5 22F 20%
C6 100pF 10%
C7 330pF 10%
RXIN
R7
RXAMPOUT
A
TXOUT
VBIAS
Figure 11: Line Interface Circuit
1998 MXCOM, INC.
Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480152.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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