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ML3356RP Datasheet(PDF) 5 Page - LANSDALE Semiconductor Inc.

No. de pieza ML3356RP
Descripción Electrónicos  Wideband FSK Receiver
Download  9 Pages
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Fabricante Electrónico  LANSDALE [LANSDALE Semiconductor Inc.]
Página de inicio  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML3356RP Datasheet(HTML) 5 Page - LANSDALE Semiconductor Inc.

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Page 5 of 9
Issue A
LANSDALE Semiconductor, Inc.
ML3356
Figure 6. Application with Self–Adjusting Bias on Data Shaper
RF In
1:2
0.01
20
19
18
17
16
15
14
13
12
11
Data
Out
5.0 V
10 k
Car. Det. Out
0 V or 4.0 V
3.3 k
130 k
3.3 k
470
pF
15 k
18 k
150 pF
RF Input
Ground
Data
Output
Comp(+)
Comp(–) Squelch
Status
Squelch
Control
Demod
Out
Demod
Filter
Quad
Input
1
470 k
470 pF
47 k
47 k
0.1
0.1
f = 10.7
1.5
µH
APPLICATION NOTES (continued)
Depending on the external circuit, inverted or noninverted
data is available at Pin 18. Inverted data makes the higher fre-
quency in the FSK signal a “one” when the local oscillator is
above the incoming RF. Figure 5 schematic shows the com-
parator with hysteresis. In this circuit the DC reference volt-
age at Pin 17 is about the same as the demodulated output
voltage (Pin 13) when no signal is present. This type circuit is
preferred for systems where the data rates can drop to zero.
Some systems have a low frequency limit on the data rate,
such as systems using the MC3850 ACIA that has a start or
stop bit. This defines the low frequency limit that can appear
in the data stream. Figure 5 circuit can then be changed to a
circuit configuration as shown in Figure 6. In Figure 6 the ref-
erence voltage for the comparator is derived from the demodu-
lator output through a low pass circuit where
τ is much lower
than the lowest frequency data rate. This and similar circuits
will compensate for small tuning changes (or drift) in the
quadrature detector.
Squelch status (Pin 15) goes high (squelch off) when the
input signal becomes greater than some preset level set by the
resistance between Pin 14 and ground. Hysteresis is added to
the circuit externally by the resistance from Pin 14 to Pin 15.
Legacy Applications Information


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