SI4785 데이터 시트보기 (PDF) - Silicon Laboratories
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SI4785 Datasheet PDF : 69 Pages
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3. Headphone Antenna for FM Receiver on FMI (Si470x/2x/3x/8x Only)
The Si470x/2x/3x FM Receiver component supports a headphone antenna interface through the FMI pin. A
headphone antenna with a length between 1.1 and 1.45 m suits the FM application very well because it is
approximately half the FM wavelength (FM wavelength is ~3 m).
3.1. Headphone Antenna Design
A typical headphone cable will contain three or more conductors. The left and right audio channels are driven by a
headphone amplifier onto left and right audio conductors and the common audio conductor is used for the audio
return path and FM antenna. Additional conductors may be used for microphone audio, switching, or other
functions, and in some applications the FM antenna will be a separate conductor within the cable. A representation
of a typical application is shown in Figure 8, “Typical Headphone Antenna Application”.
Ferrite
Beads
Antenna
Left Si47xx
Right
Figure 8. Typical Headphone Antenna Application
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Rev. 0.8
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