Catalog
8kHz/25MHz Clock Multiplier and Jitter Atten
Key Features
• Two Input Clocks* Two CMOS inputs, both 8kHz or 25MHz
• * Inputs continually monitored for frequency accuracy
• * Automatic revertive reference switching
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• Low-Bandwidth DPLL* 25Hz bandwidth for jitter attenuation
• * +/- 20ppm tracking range
• * Digital hold on loss of all inputs
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• Clock Multiplier APLL and Output Clocks* Easy to configure, encapsulated design requires no external VCXO or loop filter components
• * Two CML outputs, both 125MHz or 156.25MHz
• * Outputs easily interface with CML, LVDS or LVPECL components
• * Output jitter <1 ps RMS (12kHz - 20MHz)
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• General Features* Operates from low-cost 49.125MHz fundamental-mode crystal
• * Status output pins indicate selected input clock, holdover, and locked/unlocked states
• * Input clock selection control pin
• * Tiny 5x5mm QFN package
Description
AI
The ZL30254 is a high-performance, cost efficient, precision clock multiplier optimized for Ethernet applications that demand low-jitter clock generation. The ZL30254 accepts two input reference clocks both 8kHz or 25MHz and performs clock multiplication with jitter attenuation producing 125MHz or 156.25MHz locked output clocks.