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Si5348A-D-GM Folha de dados(PDF) 8 Page - Silicon Laboratories |
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Si5348A-D-GM Folha de dados(HTML) 8 Page - Silicon Laboratories |
8 / 54 page 3.6 External Reference (XA/XB, REF/REFb) The external crystal at the XA/XB pins determines jitter performance of the output clocks, and the external reference clock at the REF/ REFb pins determines the frequency accuracy, wander and stability during free-run or holdover modes. Jitter from the external clock on the REF/REFb pins will have little effect on the output jitter performance, depending upon the selected bandwidth. Si5348 REFb REF TCXO XB XA 48-54MHz XTAL XTAL + OSC Determines Output Jitter Performance External Reference Clock Determines Output Frequency Accuracy and Stability OSC Figure 3.4. External Reference Connections 3.6.1 External Crystal (XA/XB) The external crystal (XTAL) is used in combination with the internal oscillator (OSC) to produce an ultra low jitter reference clock for the DSPLLs. The device includes internal XTAL loading capacitors which eliminate the need for external capacitors and also has the bene- fit of reduced noise coupling from external sources. A crystal in the range of 48 to 54 MHz is recommended for best jitter performance. Although the device includes built-in XTAL load capacitors (CL) of 8 pF, crystals with load capacitances up to 18 pF can also be accom- modated. The Si5348 Reference Manual provides additional information on PCB layout recommendations for the crystal to ensure opti- mum jitter performance. Although not recommended, the device can also accommodate an external clock at the XA/XB pins instead of a crystal. Selection between the external crystal or clock is controlled by register configuration. The internal crystal loading capacitors (CL) are disabled in this mode. Refer to Table 5.12 Crystal Specifications1 on page 36 for reference clock requirements when using this mode. The Si5348 Reference Manual provides additional information on PCB layout recommendations for the crystal to ensure optimum jitter performance. OSC XB XA 48-54 MHz XTAL 2xCL 2xCL Crystal Resonator Connection Si5348 ÷ PXAXB Figure 3.5. Crystal Resonator Connections Si5348 Rev D Data Sheet Functional Description silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 7 |
Nº de peça semelhante - Si5348A-D-GM |
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Descrição semelhante - Si5348A-D-GM |
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