Design Note DN025
Johanson Technology Matched Balun Filters for CC110x & CC111x
By Richard Wallace
Keywords
Single Component Matched Balun
Filter (433 MHz or 868 MHz or 915
MHz)
Matched Balun Filter with external LC
filter (868 MHz and 915 MHz)
Optimized for compact designs
433, 868 and 915 MHz ISM Bands
CC1100
CC1101
CC1110
CC1111
CC1150
1
Introduction
It is important to note that the new
matched baluns are optimized for a single
ISM frequency band.
The three balun-filter parts are available
0433BM15A0001), 868 MHz [6.3] (part
number: 0868BM15C0001) and 915 MHz
these parts share a common footprint.
The size for the matched balun filter
component is only 2.0 mm x 1.25 mm (EIA
0805, Metric 2012) therefore it is
recommended for compact designs.
All measurement results presented in this
document are based on measurements
performed on the CC1101 JTI EM Rev 1.0
Reference Design [6], shown in Figure 1.
If the new matched filter balun is used on
this board then the external components
are not required.
The comparison performance of the JTI
Reference Design and the Discrete
Reference Designs will be discussed in
this document.
With the Johanson Technology (JTI)
matched balun filter component; the
component count is significantly reduced
whilst still obtaining the high radio
performance
desired.
This document describes the JTI matched
chip balun filters that have been
specifically designed for the CC110x and
CC111x family of ICs operating in the 433,
868 and 915 MHz ISM bands.
The existing matched filter balun
component from JTI required a
single-pole
external LC filter and a DC blocking
capacitor; part number: 0896BM15A0001
that has to be compliant at 868 MHz and
915 MHz with the external LC filter and
DC blocking cap (three external 0402
components required).
With the new balun component family,
only one component is required to achieve
compliancy at 433 MHz [6.2] or 868 MHz
external components are required.
Figure 1. CC1101 868 / 915 MHz JTI Balun EM
SWRA250A
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JOHANSON [ JOHANSON TECHNOLOGY INC. ]
