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SI4721 Datasheet(PDF) 18 Page - Silicon Laboratories |
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SI4721 Datasheet(HTML) 18 Page - Silicon Laboratories |
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18 / 69 page  AN383 18 Rev. 0.8 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”. Figure 8. Typical Headphone Antenna Application Si47xx Antenna Left Right Ferrite Beads |
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