MC33591 Datasheet, PDF (26/28 Pages) Motorola, Inc – PLL Tuned UHF Receiver for Data Transfer Applications

Freescale Semiconductor, Inc.
APPLICATION SCHEMATIC
Component
Q
R1
R2
C1
C2
C3
C4
C5
C6
C7
C8
C9
Table 11: Component description
Function
Value
315MHz band: 9.864375
Reference oscillator crystal
434MHz band: 13.580625
Current reference resistor
180 ± 1%
Strobe oscillator resistor
470
Crystal load capacitor
10
- OOK modulation -
IF amplifier AGC capacitor
100 ± 10%
- FSK modulation -
Low pass filter capacitor
See table 13
AFC capacitor
100 ± 10%
Mixer AGC capacitor
10 ± 10%
Strobe oscillator capacitor
68
100
Power supply
decoupling capacitor
100
1
Crystal DC
decoupling capacitor
10
R2 and C5 values correspond to a strobe oscillator period T_Strobe=3.8ms.
Unit
MHz
MHz
kW
kW
pF
nF
pF
nF
nF
nF
pF
nF
nF
Exemples of crystal references are given below
Table 12: Typical crystal characteristics (SMD package)
Parameter
NDK LN-G102-952
(for 315MHz)
NDK LN-G102-877
(for 434MHz)
Crystal frequency
9.864375
13.580625
Load capacitance
12
12
Motional capacitance
3.71
4.81
Static capacitance
1.22
1.36
Max loss resistance
100
50
Unit
MHz
pF
fF
pF
W
CAGC capacitor is data rate related in FSK modulation.
Table 13: C2 value versus data rate in FSK modulation
Data Rate
Unit
1.2
2.4
4.8
9.6
kBd
C2
100 ± 10% 47 ± 10% 22 ± 10% 12/10 ± 10%
nF
26
MC33591 Technical Data
MOTOROLA
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