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Si5348-D-EVB Datasheet(PDF) 9 Page - Silicon Laboratories |
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Si5348-D-EVB Datasheet(HTML) 9 Page - Silicon Laboratories |
9 / 54 page 3.6.2 External Reference (REF/REFb) The external reference at the REF/REFb pins is used to determine output frequency accuracy and stability during free-run and holdover modes. This reference is usually from a TCXO or OCXO and can be connected differentially or single-ended as shown in the figure below: Si5348 100 REF 5 – 250 MHz TCXO/ OCXO Si5348 REF 5 – 250 MHz TCXO/ OCXO Differential External Reference Connection Single-ended External Reference Connection REFb REFb Figure 3.6. External Reference Connections 3.7 Inputs (IN0, IN1, IN2, IN3, IN4) There are three inputs (IN0, IN1, and IN2) that can be used to synchronize any of the DSPLLs. The inputs accept both differential and single-ended clocks. A crosspoint between the inputs and the DSPLLs allows inputs IN0-IN2 to connect to any of the DSPLLs as shown in the figure below. DSPLL D has two additional inputs (IN3-IN4) that can be manually selected. IN3 and IN4 are CMOS only inputs. If both IN3 and IN4 are used, they must be the same frequency. Input Crosspoint DSPLL A DSPLL C DSPLL D 0 1 2 Si5348 ÷ P0n P0d ÷ P1n P1d ÷ P2n P2d IN0 IN0b IN1 IN1b IN2 IN2b 0 1 2 0 1 2 IN3 IN4 3 4 Figure 3.7. DSPLL Input Selection Crosspoint Si5348 Rev D Data Sheet Functional Description silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 8 |
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