CMX269AE2 MX-COM, Inc., CMX269AE2 Datasheet - Page 5

• Manufacturer Part Number: CMX269AE2
• Description: 1200/2400/4800bps MSK modem
• Manufacturer: MX-COM, Inc.

17, 23
4, 6,
1200/2400/4800bps MSK Modem
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
E2
19
20
21
22
24
1999 MX-COM, Inc.
Pin No.
4, 21
* After enabling the receiver, a time of at least 8 bit periods, plus 2ms, should be allowed for
the Carrier Detect circuit to stabilize and provide a valid output.
RX Enable
P6
16
18
19
20
22
1
0
D3
16
17
18
19
20
XTAL/CLOCK Frequency
Clock Rate pin
4800 Select Pin
Data Rate (bps)
1200
Time Constant
=
=
=
Carrier Detect
www.mxcom.com tel: [phone] 744 5050 fax: [phone]
1200
BPS Select
BPS Select
Clock Rate
/
2400
Name
4800
RX Function
V
Powersave
DD
Table 3: Operational Data Rate Configuration
/
Enabled
2400
Select Pin
Table 2: RX Enable Control Functions
Signal
bi-directional
Table 1: Signal List
power
Clock Data Output
Type
input
input
input
1200
Enabled
1.008MHz
0
1
0
5
0
All trademarks and service marks are held by their respective companies.
A logic ‘1’ on this pin selects the 1200bps option.
Tone frequencies are: one cycle of 1200Hz
represents a logic ‘1’, one-and-a-half cycles of
1800Hz represents a logic ‘0’.
A logic ‘0’ on this pin selects the 2400bps option.
Tone frequencies are: one-half cycle of 1200Hz
represents a logic ‘1’, one cycle of 2400Hz
represents a logic ‘0’. This pin has an internal 1M
pull-up resistor. Operational Data Rate
Configurations are illustrated in Table 3.
A logic '1' on this pin combined with a logic '0' on the
option (1M pulldown resistor). Tone frequencies
are: one-half cycle of 2400Hz represents a logic '1',
one full cycle of 4800Hz represents a logic '0'. This
state can only be achieved using a 4.032MHz Xtal
input. Operational Data Rate Configurations are
illustrated in Table 3.
A logic input to select and allow the use of either a
1.008MHz or 4.032MHz Xtal/clock. Logic ‘1’ =
4.032MHz, logic ‘0’ = 1.008MHz. This input has an
internal pulldown resistor (1.008MHz).
Part of the carrier detect integration function. The
value of C4 connected to this pin will affect the
carrier detect response time and therefore the noise
performance.
Positive supply. A single 2.7 to 5.0 volt supply is
required. This pin should be bypassed to V
capacitor (C5).
No internal connection, do not use.
1200
2400
0
0
0
/
2400
1200
Carrier Detect
1
1
0
BPS Select pin will select the 4800
* Enabled
4.032MHz
1 or 0
CMX469A PRELIMINARY INFORMATION
2400
1
0
0
Description
4800
1
0
1
Rx Sync Out
Enabled
1 or 0
Doc. # 20480191.002
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