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SI5347-46 Scheda tecnica(PDF) 8 Page - Silicon Laboratories |
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SI5347-46 Scheda tecnica(HTML) 8 Page - Silicon Laboratories |
8 / 13 page 6. Exit From Holdover Ramp Feature Not Functional Description The exit from holdover ramp feature is not functional. Impact Using the ramp feature to lock to a new input frequency while exiting from holdover does not function. The user cannot select holdover modes that exit using a frequency ramp. Instead, the exit from holdover frequency rate of change needs to be governed by the loop bandwidth. Workaround When exiting from holdover, use a loop bandwidth-determined exit from holdover. For example, loop bandwidth-controlled exit from holdover can be configured to meet the requirements of Stratum 3 and many other standards. To do this, ensure HOLD_RAMP_BYP_PLLA, HOLD_RAMP_BYP_PLLB, HOLD_RAMP_BYP_PLLC, and HOLD_RAMP_BYP_PLLD are set high at loca- tions 0x042C[3], 0x052C[3], and 0x062D[3). These registers have been set correctly since CBPro v1.0 was released. Resolution This erratum will be fixed in the next silicon revision. Data Sheet Errata for Product Revision B Exit From Holdover Ramp Feature Not Functional silabs.com | Smart. Connected. Energy-friendly. Rev. 2.0 | 6 |
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