1200/2400/4800bps MSK Modem
9
MX469
4.1.3 4800bps
Characteristics
Note
Min.
Typ.
Max.
Unit
TX Enable to TX Sync Rise Time
TX Delay, Signal to Disable Time
Data Set-Up Time
tSYNC
tESET
tDSET
tDH
104
µs
2.0
2.0
2.0
200
µs
µs
µs
µs
µs
µs
1
Data Hold Time
TX Delay to O/P Time
TX Data Rate Period
tTxD
1.2
tTDR
tRDR
208
RX Data Rate Period
200
216
2.0
Undetermined State
Internal RX Delay
µs
tID
1.0
ms
Notes:
1. Consider the Xtal/Clock tolerance.
2. All TX timings are related to the TX Sync Output.
t SYNC
tESET
TX
ENABLE
TX
SYNC
t DH
tTDR
tTDR
tDSET
DC
DV
=
=
Don't Care
Data Valid
TX DATA
DC
DC
DC DV DC DV DC DV DC DV DC
DV
DV
tTXD
OPEN CIRCUIT
OPEN CIRCUIT
4800 BPS
TX OUTPUT
Figure 7: Transmitter Timing: 4800bps
LOGIC '0'
LOGIC '0'
LOGIC '1'
LOGIC '1'
RX
SIGNAL I/P
4800 BPS
tID
1
RX
SYNC O/P
(4800Hz)
0
1
Undetermined
State
t RDR
CLOCKED
DATA O/P
LOGIC '1'
LOGIC '0'
LOGIC '1'
LOGIC '0'
0
Figure 8: Receiver Timing: 4800bps
ꢀ1998 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
Doc. # 20480081.010
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