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ZL30105 Datasheet(PDF) 12 Page - Zarlink Semiconductor Inc |
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ZL30105 Datasheet(HTML) 12 Page - Zarlink Semiconductor Inc |
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12 / 52 page  ZL30105 Data Sheet 12 Zarlink Semiconductor Inc. operation of the reference monitor circuit, the minimum input pulse width restriction of 15 nsec must be observed. • Reference Frequency Detector (RFD): This detector determines whether the frequency of the reference clock is 2 kHz, 8 kHz, 1.544 MHz, 2.048 MHz 8.192 MHz, 16.384 MHz or 19.44 MHz and provides this information to the various monitor circuits and the phase detector circuit of the DPLL. • Precise Frequency Monitor (PFM): This circuit determines whether the frequency of the reference clock is within the selected accuracy range, see Table 1. • Coarse Frequency Monitor (CFM): This circuit monitors the reference frequency over intervals of approximately 30 µs to quickly detect large frequency changes. • Single Cycle Monitor (SCM): This detector checks the period of a single clock cycle to detect large phase hits or the complete loss of the clock. Figure 3 - Reference Monitor Circuit Exceeding the thresholds of any of the monitors forces the corresponding REF_FAIL pin to go high. The single cycle and coarse frequency failure flags force the DPLL into Holdover mode and feed a timer that disqualifies the reference input signal when the failures are present for more than 2.5 s. The single cycle and coarse frequency failures must be absent for 10 s to let the timer re-qualify the input reference signal as valid. Multiple failures of less than 2.5 s each have an accumulative effect and will disqualify the reference eventually. This is illustrated in Figure 4 where REF0 experiences disruptions while REF1 is stable. Reference Frequency Detector Single Cycle Monitor Precise Frequency Monitor Coarse Frequency Monitor dis/requalify timer REF0 / REF1 / REF2 OR OR OR REF_OOR = reference out of range. REF_DIS= reference disrupted. Both are internal signals. Reference select state machine REF_SEL1:0 REF_OOR Mode select state machine HOLDOVER REF_DIS REF_FAIL0 / REF_FAIL1 / REF_FAIL2 |
Similar Part No. - ZL30105_05 |
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Similar Description - ZL30105_05 |
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