Si5348-D-EVB datasheet(9/54 Pages) SILABS

Part #	Si5348-D-EVB

Description	Network Synchronizer for SyncE/ 1588 PTP Telecom Boundary (T-BC) and Slave (T-SC) Clocks

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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

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

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Rev. 1.0 | 8

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Si5348-D-EVB Datasheet(PDF) 9 Page - Silicon Laboratories

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