1200/2400/4800bps MSK Modem
9
MX469
4.1.3 4800bps
Characteristics
TX Enable to TX Sync Rise Time
TX Delay, Signal to Disable Time
Data Set-Up Time
Data Hold Time
TX Delay to O/P Time
TX Data Rate Period
RX Data Rate Period
Undetermined State
Internal RX Delay
t
ID
1.0
t
SYNC
t
ESET
t
DSET
t
DH
t
TxD
t
TDR
t
RDR
200
1
2.0
2.0
2.0
1.2
208
216
2.0
Note
Min.
Typ.
104
Max.
200
Unit
µs
µs
µs
µs
µs
µs
µs
µs
ms
Notes:
1. Consider the Xtal/Clock tolerance.
2. All TX timings are related to the TX Sync Output.
t
SYNC
TX
ENABLE
MX469P package discontinued
t
ESET
TX
SYNC
t
DSET
TX DATA
DC = Don't Care
DV = Data Valid
t
DH
t
TDR
DC
DV
DC
DV
DC
DV
t
TDR
DC
DV
DC
DC
DV
DC
DV
t
TXD
4800 BPS
TX OUTPUT
OPEN CIRCUIT
OPEN CIRCUIT
Figure 7: Transmitter Timing: 4800bps
LOGIC '1'
LOGIC '0'
LOGIC '1'
LOGIC '0'
RX
SIGNAL I/P
4800 BPS
1
t
ID
RX
SYNC O/P
(4800Hz)
0
t
RDR
1
Undetermined
State
CLOCKED
DATA O/P
0
LOGIC '1'
LOGIC '0'
LOGIC '1'
LOGIC '0'
Figure 8: Receiver Timing: 4800bps
1998
MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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CMLMICRO [ CML MICROCIRCUITS ]
