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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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SI4840 Fiches technique(PDF) 2 Page - Silicon Laboratories |
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SI4840 Fiches technique(HTML) 2 Page - Silicon Laboratories |
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2 / 38 page  AN602 2 Rev. 0.3 2. Si4822/26/27/40/44 Default Frequency Band Definition and Selection For Si4822/26/27/40/44, there are two methods for defining a frequency band, one is to select one of the chip internal default bands by using the slide switch and resistor ladder. Another method is to use the host MCU sending command to make the chip work in the desired band. Refer to application note, “AN610: Si48xx ATDD Programming Guide”, for information on how to use the Si4822/26/27/40/44 to define a frequency band and set a band property. This section describes how to select the default frequency band by using the slide switch and resistors ladder. The Si4822/40 has five defined FM bands and five defined AM bands. The Si4826/27/44 has an added 16 SW bands. In each FM band, the parts also offer two de-emphasis selections and two LED stereo separation threshold selections, which results in a total 41 combinations to choose from. The Si4822/26/40/44-A supports FM band range less than 23 MHz and SW band range less than 1.15 MHz. The Si4827-A/44-B supports wider FM/SW band range. Refer to application note, “AN610: Si48xx ATDD Programming Guide” for details. 2.1. Si4822/26/27/40/44 Default Band Definition For Si4822/26/27/40/44, the FM band definition is in fact a combination of frequency range, de-emphasis, and LED stereo separation threshold. Customers should choose the band according to not only frequency range, but also de-emphasis setting and LED stereo separation requirements. For AM and SW, simply choose the band according to the frequency range desired. Table 2. Band Sequence Definition Band Number Band Name Band Frequency Range De-emphasis (FM) Channel Space (AM) Stereo LED on Conditions (Only for Si4840/44) Total R to GND (k , 1%) Band1 FM1 87–108 MHz 75 µs Separation = 6 dB, RSSI = 20 47 Band2 FM1 87–108 MHz 75 µs Separation = 12 dB, RSSI = 28 57 Band3 FM1 87–108 MHz 50 µs Separation = 6dB, RSSI = 20 67 Band4 FM1 87–108 MHz 50 µs Separation = 12 dB, RSSI = 28 77 Band5 FM2 86.5–109 MHz 75 µs Separation = 6 dB, RSSI = 20 87 Band6 FM2 86.5–109 MHz 75 µs Separation = 12 dB, RSSI = 28 97 Band7 FM2 86.5–109 MHz 50 µs Separation = 6 dB, RSSI = 20 107 Band8 FM2 86.5–109 MHz 50 µs Separation = 12 dB, RSSI = 28 117 Band9 FM3 87.3–108.25 MHz 75 µs Separation = 6 dB, RSSI = 20 127 |
Numéro de pièce similaire - SI4840 |
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Description similaire - SI4840 |
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