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DS3102GN+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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DS3102GN+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 141 page ____________________________________________________________________________________________ DS3102 Rev: 102808 10 of 141 The entire chip is clocked from the external oscillator connected to the REFCLK pin. Thus, the free-run and holdover stability of the DS3102-based timing card is entirely a function of the stability of the external oscillator, the performance of which can be selected to match the application: TCXO, OCXO, double-oven OCXO, etc. The 12.8MHz clock from the external oscillator is multiplied by 16 by the Master Clock Generator block to create the 204.8MHz master clock used by the rest of the device. Since every block on the device depends on the master clock and therefore the local oscillator clock for proper operation, the master clock generator has a watchdog timer (WDT) function that can be used to signal a local microprocessor in the event of a local oscillator clock failure. The DS3102 also has several features to support master/slave timing card redundancy and protection. Two DS3102 devices on redundant cards can be configured to maintain the same priority tables, choose the same input references, and generate output clocks and frame syncs with the same frequency and phase. |
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