CMX469AE2 CML Microcircuits, CMX469AE2 Datasheet - Page 12

• Manufacturer Part Number: CMX469AE2
• Description: 1200/2400/4800 Baud FFSK Modem
• Manufacturer: CML Microcircuits

1200/2400/4800 Baud FFSK/MSK Modem
2001 Consumer Microcircuits Limited
Interface Timing Diagrams
The optimum time to sample the CLOCKED DATA O/P is on the falling edge of RX SYNC O/P.
2400/4800 BAUD
1200 BAUD
SIGNAL I/P
SIGNAL I/P
SYNC O/P
Tx OUTPUT
DATA O/P
2400 BAUD
1200 BAUD
Tx OUTPUT
CLOCKED
(1200Hz)
Tx DATA
ENABLE
Therefore the optimum time to change TX DATA is on the falling edge of TX SYNC.
Rx
Rx
Rx
SYNC
Tx
Tx
TX DATA must be valid at the time of the rising edge of TX SYNC.
1
0
1
0
DC
DV
= Don't
= Data Valid
OPEN CIRCUIT
OPEN CIRCUIT
LOGIC '1'
Care
t
RDR
t
DSET
DSET
DC
Figure 4 Transmitter Timing
Figure 5 Receiver Timing
t
ID
DV
t
TxD
t
DH
DC
LOGIC '0'
13
DV
t
TDR
DC
Undetermined
DV
State
LOGIC '1'
t
ESET
t
TDR
DC
OPEN CIRCUIT
OPEN CIRCUIT
LOGIC '0'
CMX469A
D/469A/2