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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT9015 датащи(PDF) 19 Page - Holtek Semiconductor Inc |
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HT9015 датащи(HTML) 19 Page - Holtek Semiconductor Inc |
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19 / 23 page  HT9015 19 April 10, 2000 Preliminary PLL The figure below shows a simplified block dia- gram of the programmable universal dual phase-locked loop (PLL). It provides accurate channel frequencies for cordless phone. The PLL contains one 14-bit programmable counter, one phase detector, charge pump, un- lock detector and the 2nd local oscillator. The 12-bit programmable counter provides the ref- erence frequency for the receiver (RX) and transmitter (TX) loops. This dual PLL is fully programmable through the mC serial interface and supports most coun- try channel frequencies including USA, Spain, Australia, Korea, New Zealand, U.K., Nether- lands, France, Taiwan, and China. C har ge PU M P ( R X ) C har ge PU M P ( T X ) RX _ V CO P has e D e te c t o r ( R X ) P has e D e te c t o r ( T X ) 12- B i t R E F C ount e r 14- B i t T X C ount e r LO C A L O s c illa t o r D a t a Lat c h R egi s t er 14- B i t R X C ount e r VC O _ C O N T VC O 1 VC O 2 RX _ O UT TX _ O U T LO 2 LO 1 Figure 9 PLL block diagram |
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