MX469D3 データシートの表示（PDF） - MX-COM Inc
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MX469D3 Datasheet PDF : 17 Pages
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1200/2400/4800bps MSK Modem
P DW D3
17 18 15
Signal
RX Sync
16 19 16
1200/ 2400 BPS
Select
18 20 17 4800 BPS Select
19 21 18
Clock Rate
20 23 19
Carrier Detect
Time Constant
22 24 20
VDD
4, 4, 6,
N/C
21 17,
22
5
Type Description
MX469
output
input
input
input
output
power
A flywheel squarewave output. This clock will
synchronize to incoming RX MSK data. (See Figure 4
and Figure 6).
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
1200/2400 BPS Select pin will select the 4800 option
(1M pulldown resistor). Tone frequencies are: one-half
cycle of 2400Hz represents a logic '1', one 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 (See
Figure 2, Note 3).
Positive supply. A single 5-volt supply is required.
No Internal Connection.
Table 1: Signal List
RX Enable = RX Function Clock Data Output Carrier Detect Rx Sync Out
1
=
Enabled
Enable
Enabled
Enabled
0
= Powersave
0
0
1 or 0
Table 2: RX Enable Control Functions
XTAL/CLOCK Frequency
Clock Rate pin
1200/2400 Select Pin
4800 Select Pin
Data Rate (bps)
1.008MHz
0
0
1
0
0
0
1200 2400
4.032MHz
1
1
1
1
0
0
0
0
1
1200 2400 4800
Table 3: Operational Data Rate Configuration
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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