0433BM15A0001E Datasheet, PDF (20/27 Pages) Johanson Technology Inc. – Johanson Technology Matched Balun Filters for CC110x & CC111x

Design Note DN025
4 Conclusion
As an alternative to the traditional discrete reference designs as shown in Figure 2 and Figure
3; the JTI reference designs can match the performance of the discrete multi-layer inductor
reference design with a lower component count. The 868 / 915 MHz discrete solution has a
total of 12 components in the RF section compared to the JTI solution of 2 to 4 components
depending on the usage of the LC filter.
For compact designs; the new matched Filter baluns at 433 MHz [6.2] or 868 MHz [6.3] or
915 MHz [6.4] from Johanson is recommended. The RF section component count is reduced
to a single component.
For best performance; the discrete wire-wound inductor solution [10] is recommended and for
the lowest cost; the integrated ValueLine reference design is recommended.
For applications that require conducted emissions approval (application with an external RF
connector); the 433 MHz [6.2] or 868 MHz [6.3] or 915 MHz [6.4] matched filter baluns are
more beneficial since the notch filter has been designed into the filter. Since these baluns
incorporate the additional notch filter, extra filtering and DC blocking capacitor this has
caused a slightly higher insertion loss than the 868/915 MHz balun solution [6.1].
Table 7 summarizes the various reference designs available for CC110x and CC111x.
Performance
Typical output
Power for Maximum
Power setting
Integrated
Inductor
ValueLine
Middle
11.0 dBm
Wire-wound
Discrete
JTI 868/915
MHz
Highest
Middle
12.0 dBm
11.0 dBm
JTI 433 MHz
or 868 MHz
or 915 MHz
Middle
10.5 dBm
Size
Largest
Middle
Middle
Smallest
RF Component
Count (no notch
6
filter)
RF Component
Count (with notch
7
filter)
12
2 to 4
1
14
4 to 6
1
Table 7. Summary Overview of Reference Designs Available
SWRA250A
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