PHASE-LOCKED LOOP CLOCK GENERATORS
●Introduction
■Phase-locked loops(PLLs) are used extensively in the areas of analog system design and communication systems.With the increasingly stringent timing constraints in high performance systems today, phase-locked loops are being introduced in more general digital designs as well. The computer motherboard is one example of such a mainstream application.
The key advantages that PLLs bring to clock distribution applications are phase/delay compensation, frequency multiplication and duty-cycle correction. This application note introduces users to PLL operation and gives guidelines on their use and application.
IDT makes several PLL-based clock drivers :
◆FCT88915TT - 8 outputs with external loop filter capacitor, 3-state outputs and TTL output voltage swings
◆FCT388915T - 3.3V version of the 88915TT
◆FCT3932 - 3.3V programmable PLL with 18 outputs
■ Most of the discussion below is geared towards IDT's PLL-based clock chips. The reader is advised to refer to individual datasheets for specific device characteristics.
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FCT88915TT 、 FCT388915T 、 FCT3932 、 88915TT 、 FCT3888915T 、 FCT3908 、 FCT3907 |
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[ computer motherboard ][ analog system design ][ communication systems ] |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2020/01/08 |
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AN-155 |
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295 KB |
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