XE1283
5.1.1.3 VCO Tank
The tank of the VCO will be implemented with one inductor in parallel with one capacitor. The recommended
characteristics of these components must be as follows (if possible the capacitor has to be avoided):
Name
CV1
LV1
Typical Value
for 434MHz
1 pF
33 nH
Typical Value
for 868 MHz
NC
8.2 nH
Typical Value
for 915 MHz
NC
6.8 nH
Tolerance
± 5%
± 2%
5.1.1.4 Loop filter
The loop filter of the frequency synthesizer is shown below.
XE1283
Figure 11 : XE1283 Loop filter
The values recommended for applications using bit rates up to 38.4kbit/s are given in the table below.
Name
CL1
CL2
RL1
Typical Value
for 434 MHz
22 nF
1.2 nF
560 ?
Typical Value
for 868 MHz
22 nF
1.2 nF
470 ?
Typical Value
for 915 MHz
22 nF
1.2 nF
470 ?
Tolerance
± 5%
± 5%
± 5%
The values recommended for applications using bit rates higher than 38.4 kbit/s are given in the table below.
Name
CL1
CL2
RL1
Typical Value
for 434MHz
3.3 nF
220 pF
1.2 k ?
Typical Value
for 868 MHz
4.7 nF
330 pF
1 k ?
Typical Value
for 915 MHz
4.7 nF
330 pF
1 k ?
Tolerance
± 5%
± 5%
± 5%
? Semtech 2005
20
www.semtech.com
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