Freescale Semiconductor, Inc.
MC33593
Table 11: Component description
Component
Q
R1
R2
C1
Function Value
Reference oscillator crystal 868MHz band: 13.5775
Current reference resistor 180 ± 1%
Strobe oscillator resistor 470
Crystal load capacitor 10
Unit
MHz
k ?
k ?
pF
C2
- OOK modulation -
IF amplifier AGC capacitor
- FSK modulation -
Low pass filter capacitor
100 ± 10%
See table 13
nF
C3
C4
C5
AFC capacitor 100 ± 10%
Mixer AGC capacitor 10 ± 10%
Strobe oscillator capacitor 68
pF
nF
nF
C6
C7
C8
C9
Power supply
decoupling capacitor
Crystal DC
decoupling capacitor
100
100
1
10
nF
pF
nF
nF
R2 and C5 values correspond to a strobe oscillator period T Strobe =3.8ms.
Exemple of crystal reference is given below.
Table 12: Typical crystal characteristics (SMD package)
Parameter NDK LN-G102-955 (for 868MHz)
Crystal frequency 13.5775MHz
Load capacitance 12
Motional capacitance 4.8
Static capacitance 1.43
Max loss resistance 50
CAGC capacitor is data rate related in FSK modulation.
Table 13: C2 value versus data rate in FSK modulation
Data Rate
1.2 2.4 4.8 9.6
Unit
MHz
pF
fF
pF
?
Unit
kBd
For More Information On This Product,
Go to: www.freescale.com
? Motorola, Inc., 2002.
C2
100 ± 10% 47 ± 10% 22 ± 10% 12/10 ± 10%
MOTOROLA SEMICONDUCTORS PRODUCTS
25
nF
revision 7.0, 5 February 2002
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