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EM250
7 Typical Application
Figure 16 illustrates the typical application circuit, and Table 39 contains an example Bill of Materials for the
off-chip components required by the EM250.
Note:
The circuit shown in Figure 16 is for illustrations purposes only as it does not contain the decoupling
capacitors for the different VDD nets. For a complete reference design, please download one of the
Silicon Labs Reference Designs from the Silicon Labs website ( www.silabs.com/zigbee ).
The Balun provides the impedance transformation from the antenna to the EM250 for both TX and RX modes.
Silicon Labs has developed reference designs based upon two balun topologies, a monolithic (ceramic) balun
and a LC Lattice Balun.
The harmonic filter (L2, C2 and C3) provides additional suppression of the second harmonic, which increases
the margin over the FCC limit.
The 24MHz crystal with loading capacitors is required and provides the high frequency source for the EM250.
The 32.768kHz crystal generates the clock source for the Sleep Timer, but it is not mandatory as the internal
RC Oscillator can be used.
The RC debounce filter (R4 and C9) is suggested to improve the noise immunity of the RESET logic (Pin 13).
Figure 16. Typical Application Circuit
120-0082-000V Rev 1.1
Page 108
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