CMX469A Ver la hoja de datos (PDF) - CML Microsystems Plc
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CMX469A Datasheet PDF : 16 Pages
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1200/2400/4800 Baud FFSK/MSK Modem
CMX469A
D3
E2
P6
Signal
Description
CMX469A
Pin
Pin
Pin
No.
No.
No.
Name
Type
13
15
14
CARRIER
O/P When an FFSK/MSK signal is being received
DETECT O/P
this output is a logic ‘1’.
14
16
15 Rx SIGNAL I/P I/P The FFSK/MSK signal input for the receiver. This
input should be coupled via a capacitor, C3.
15
18
17 Rx SYNC O/P O/P A flywheel squarewave output. This clock will
synchronize to incoming Rx FFSK/MSK data.
16
19
16
1200/2400
I/P A logic ‘1’ on this pin selects the 1200 baud
BAUD
option. Tone frequencies are: one cycle of
SELECT
1200Hz represents a logic ‘1,’ one-and-a-half
cycles of 1800Hz represents a logic ‘0.’
A logic ‘0’ on this pin selects the 2400 baud
option. Tone frequencies are: one-half cycle of
1200Hz represents a logic ‘1,’ one cycle of
2400Hz represents a logic ‘0.’ This function is
also used, in part, to select the 4800 baud
option. This pin has an internal 1MΩ pullup
resistor.
17
20
18
4800 BAUD I/P A logic ‘1’ on this pin combined with a logic ‘0’ on
SELECT
the 1200/2400 BAUD SELECT pin will select the
4800 baud option (1MΩ pulldown resistor).
Tone frequencies are: one-half cycle of 2400Hz
represents a logic ‘1,’ one cycle of 4800Hz
represents a logic ‘0.’ Operation at 4800 baud is
only achieved by using a 4.032MHz Xtal or
clock.
18
21
19 CLOCK RATE I/P 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).
19
22
20
CARRIER
BI Part of the carrier detect integration function. The
DETECT TIME
value of C4 connected to this pin will affect the
CONSTANT
carrier detect response time and hence noise
performance.
20
24
22
VDD
PWR Positive supply rail. A single 2.7 to 5.0 volt
supply is required. This pin should be decoupled
4, 6, 4, 21
17, 23
to VSS by a capacitor (C5).
No internal connection, do not use.
Notes: I/P = Input
O/P = Output
BI = Bidirectional
PWR = Power
© 2001 Consumer Microcircuits Limited
6
D/469A/2
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