MC3362 데이터 시트보기 (PDF) - Motorola => Freescale
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MC3362 Datasheet PDF : 8 Pages
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MC3362
Figure 10. PC Board Test Circuit
(LC Oscillator Configuration Used in PLL Synthesized Receiver)
RF Input
18 p
1000 p
49.67 MHz
1
50 Ω
0.47 µ 2
VCC = 2.0 to 7.0 Vdc
120 p
3
50 p
4
10.245, Fund. Mode
32 pF Load
5
455 kHz
Cer. Filt.
CRF1
6
Carrier
Detect
7
0.1
8
0.1 0.1
9
100 k
51 k
10
CD Adjust
10 k
11
39 k
12
455 kHz
LC Resonator
VCC
–+
(MC3362)
24
0.01
23
p p Varactor Control
(keep 0.7 V
0.01
V23
VCC)
(This network must be tuned to exactly
22
10.7 MHz above or below the incoming
33 p 0.41 µ
RF signal.
21
NOTE: The IF is rolled off above 10.7
MHz to reduce L.O. feedthrough.)
20
First Local Oscillator
Buffered Output
3.0 k
19
CRF2
18
10.7 MHz
Cer. Filt.
17
0.1
16
15
10 k
14
to VCC
CRF1 = muRata CFU 455X – the X
suffix denotes 6.0 dB bandwidth.
Rin = Rout = 1.5 to 2.0 kΩ.
CRF2 = muRata SFA10.7 MF5 or
SFE10.7 or equivalent. Rin = Rout
= 330 Ω . Crystal filters can be
1
used but impedance matching will
need to be added to ensure proper
filter characteristics are realized.
FSK Data Output
(optional)
13
0.001
8.2 k
Recovered
Audio
0.01
Figure 10A. Crystal Oscillator Configuration for Single Channel Application
23
22
0.68 µ
20 k
300
VCC
21
0.68 µ
20 k
38.97 MHz
Crystal used is series mode resonant
(no load capacity specified), 3rd overtone.
This method has not proven adequate for
fundamental mode, 5th or 7th overtone crystals.
The inductor and capacitor will need to be
changed for other frequency crystals. See
AN980 for further information.
4
MOTOROLA ANALOG IC DEVICE DATA
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