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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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UPD17062 Datasheet(PDF) 228 Page - Renesas Technology Corp |
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UPD17062 Datasheet(HTML) 228 Page - Renesas Technology Corp |
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228 / 298 page  226 µPD17062 18.5.2 Functions of the Phase Comparator ( φ-DET) As shown in Fig. 18-5, the phase comparator compares the phase of the output frequency “fN” of the programmable divider (PD) and the phase of the reference frequency “fr”, and outputs the up request signal (UP) or down request signal (DW). If the divider output frequency fN is lower than the reference frequency fr, the phase comparator outputs an up request. If fN is higher than fr, the phase comparator outputs a down request. Fig. 18-6 shows the relationship among the reference frequency fr, divider output frequency fN, up request UP, and down request DW. In the PLL disable mode, neither up nor down request is output. The up and down requests are directed to the charge pump and unlock detection block. |
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