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ZLNB2004 Datasheet(PDF) 8 Page - Diodes Incorporated |
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ZLNB2004 Datasheet(HTML) 8 Page - Diodes Incorporated |
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8 / 12 page  FURTHER INFORMATION 1) Inputs VPOL1 and VPOL2 are designed to be wired to the power inputs of an LNB via high value (10k) resistors. Input VPOL1 controls outputs HVout1 and Enable1. Input VPOL2 controls outputs HVout2 and Enable2. With either input voltage set at or below 14V, the corresponding HVout pin will be in active. With either input v o l t age at or above 15. 5V , the corresponding HVout pin will be active. Should the voltage applied to either VPOL input fall below 8V, the corresponding Enable pin will be low, otherwise these outputs will be high.Any input or output not required may be left open-circuit. 2) The ZLNB2001/2 includes the circuitry necessary to detect the presence of 22kHz tones modulated on either of two supply inputs to the lnb. The main elements of the detectors in each channel are an op-amp enabling the construction of a Sallen Key filter, a rectifier/smoother and a comparator. Full user control is given over the centre frequency and bandwidth of the filter using two external resistors and capacitors (one of these resistors shares the function of overvoltage protection of the corresponding VPOL pin, i.e. the 10k referenced in note 1). The comparator circuit utilises no external components. The presence of a 22kHz tone applied to pin Fin1 or Fin2 switches the corresponding output Tout1 or Tout2 high. 3) The ZLNB2003 / 4 includes the circuitry necessary to detect the presence of 22kHz tones modulated on either of two supply inputs to the LNB. The main elements of the detectors in each channel are an op-amp enabling the construction of a Sallen Key filter, a rectifier/smoother and a comparator. Full user control is given over the centre frequency and bandwidth of the filter using two external resistors and capacitors (one of these resistors shares the function of overvoltage protection of the corresponding Vpol pin, i.e. the 10k referenced in note 1). The comparator circuit utilises no external components. The presence of a 22kHz tone applied to pin Fin1 or Fin2 switches the corresponding output Tout1 or Tout2 hi gh. Pins Crec1 and Crec2 make accessible the outputs of the tone switch rectifiers and provides a means of c ont rolling t one s w it c h delays . Significant switching delays may be necessary to avoid incorrect operation in the presence of unwanted interference (e.g. switching tones intended for other s i gnalling s y s t ems ) . For c orrec t operation of the IC, a capacitor and a parallel connected resistor should be connected between each Crec pin and ground. The Tout low to high delays are set solely by the added capacitors at approximately 22ms/uF. The high to low delays are set by the time constant of each resistor capacitor combination at a pproxi matel y 0. 2C R second s. A capacitor of 100nF and resistor of 1MW will give a low to high delay of around 2.2ms and a high to low delay of 20ms, providing immunity to the 60Hz square wave signal occasionally used for switching between multiple LNB units. ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 87 |
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Similar Description - ZLNB2004 |
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