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TA0321 Datasheet(PDF) 4 Page - STMicroelectronics |
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TA0321 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 12 page 3 22kHz Tone and DiSEqC (Digital Satellite Equipment Control) Encoding TA0321 4/12 3 22kHz Tone and DiSEqC (Digital Satellite Equipment Control) Encoding In addition to selecting the polarization, the LNB needs to select the operating band. Indeed, each reception band is divided in two bands: ● Low Band (10.7-11.7 GHz) ● High Band (11.7-12.75 GHz). This is done with the use of a 22kHz tone frequency. A 22 kHz pulse-position modulated signal of about 0.6 V amplitude is superimposed on the LNB's DC power rail. Its coding scheme also allows the remote electronics to perform more complex functions. Traditionally, when other encoding functions do not require the 22 kHz tone, simple presence or absence of this tone selects the operating band by changing the local oscillator frequency of the LNB. The complex encoding of the 22 kHz burst is done with a more sophisticated communication bus protocol named the DiSEqC standard (Digital Satellite Equipment Control). The open DiSEqC standard developed by the European Telecommunication Satellite Organization is a well accepted worldwide standard for communication between satellite receivers and satellite peripheral equipment. The 22 kHz oscillator has to be a tone generator with specific rise and fall time. The wave shape will be a quasi-square wave (sine with flat-top). The required frequency tolerance is ±2 kHz over line and temperature variations. Table 1. Band and polarization selection table Parameters 22 kHz Tone present 22 kHz Tone absent Operating band High Low VDC 13 V Vertical polarization Vertical polarization 18 V Horizontal polarization Horizontal polarization |
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