时钟芯片Si5347在进行抖动性能测试时，测试抖动指标超过文档提供的指标值，请问这是什么原因?

Low-Jitter, Quad DSPLL, 8-Output, Any Frequency (<712.5MHz), Any Output, Jitter Attenuator

Factory pre-programmedQuad PLL Jitter Attenuator:8-outputs up to 800 MHz

Low-Jitter, Quad DSPLL, 8-Output, Any Frequency (<712.5MHz), Any Output, Jitter Attenuator

Quad DSPLL™ Jitter Attenuators

SI5347D-D、SI5347、SI5347D系列

Factory pre-programmed: Quad PLL Jitter Attenuator, 4-outputs up to 350 MHz.

64-Lead QFN

Quad DSPLL™ Jitter Attenuators

SI5347D-D、SI5347、SI5347D系列

Factory pre-programmed: Quad PLL Jitter Attenuator, 4-outputs up to 350 MHz.

64-Lead QFN

Base/blank prototyping device:Quad PLL Jitter Attenuator:8-outputs up to 800 MHz

Low-Jitter, Dual DSPLL, 4-Output, Any Frequency (<350MHz), Any Output, Jitter Attenuator

HIGH-FREQUENCY, ULTRA-LOW JITTER ATTENUATOR CLOCK WITH DIGITALLY-CONTROLLED OSCILLATOR

SI5342H、SI5342系列

Blank protoyping device: Coherent Optical Jitter Attenuator Clock 2-outputs <2.7GHz.频点定制.时钟定制.可编程服务.频点烧录

44-Lead QFN

Low-Jitter,10-Output, Any-Frequency, Any-Output Clock Generator

SI5341B、SI5341系列

Base/blank prototyping device:频点定制.时钟定制.可编程服务.频点烧录

64-QFN

10-Channel, Any-Frequency, Any-Output Jitter Attenuator/Clock Multiplier

Si5344、SI5344B、Si5344B-D系列

Low-jitter, 4-output, any frequency (< 350 MHz), any output jitter attenuator

44-QFN

Low-Jitter, 4-Output, Any Frequency (<350MHz), Any Output, Jitter Attenuator

Dual/Quad DSPLL™ Jitter Attenuators

SI5346、SI5346A系列

Factory pre-programmedDUAL PLL Jitter Attenuator:4-outputs up to 800 MHz.频点定制.时钟定制.可编程服务.频点烧录

44-Lead QFN

Base/blank prototyping device:

Base/blank prototyping device:Single PLL Jitter Attenuator:2-outputs up to 800 MHz;

2-Output Low Phase Noise Jitter Attenuating Clock Generator

Si5342B、Si5342、Si5342B-Dxxxxx-GM系列

Factory pre-programmed: Single PLL Jitter Attenuator: 2-outputs up to 350 MHz; Integer+Fractional synthesis

44-QFN

10-Output Low Jitter Any-Frequency Clock Generator

Si5341、Si5341B系列

Ultra low-jitter, 10-output, any frequency (< 350MHz), any output clock generator

64-QFN

si5341-d-evb

HIGH-FREQUENCY, ULTRA-LOW JITTER ATTENUATOR CLOCK WITH DIGITALLY-CONTROLLED OSCILLATOR

SI5342H、SI5342系列

Blank protoyping device: Coherent Optical Jitter Attenuator Clock 2-outputs <2.7GHz. 频点定制.时钟定制.可编程服务.频点烧录

44-Lead QFN

Base/blank prototyping device:SyncE/1588/Stratum 3/3E Network Synchronizer:5-inputs/7-outputs up to 350 MHz

10-Channel, Any-Frequency, Any-Output Jitter Attenuator/ Clock Multiplier

SI5345B、SI5345系列

Base/blank prototyping device:Single PLL Jitter Attenuator:10-outputs up to 350 MHz;频点定制.时钟定制.可编程服务.频点烧录

64-QFN

HIGH-FREQUENCY, ULTRA-LOW JITTER ATTENUATOR CLOCK WITH DIGITALLY-CONTROLLED OSCILLATOR

SI5344H、SI5344系列

Blank protoyping device: Coherent Optical Jitter Attenuator Clock 4-outputs <2.7GHz.频点定制.时钟定制.可编程服务.频点烧录

44-Lead QFN

Low-Jitter, 4-Output, Any-Frequency, Any-Output Clock Generator

SI5340、SI5340A系列

Base/blank prototyping device:Clock Generator:4-outputs up to 800 MHz;Integer+Fractional synthesis 频点定制.时钟定制.可编程服务.频点烧录

44-QFN

10-Channel, Any-Frequency, Any-Output Jitter Attenuator/ Clock Multiplier

SI5345A、SI5345系列

Base/blank prototyping device:Single PLL Jitter Attenuator:10-outputs up to 800 MHz;频点定制.时钟定制.可编程服务.频点烧录

64-QFN

Low-Jitter, 4-Output, Any-Frequency, Any-Output Clock Generator

SI5340、SI5340B系列

Factory pre-programmed: Clock Generator: 4-outputs up to 350 MHz; Integer+Fractional synthesis.

44-QFN

Base/blank prototyping device:Single PLL Jitter Attenuator:4-outputs up to 800 MHz;Integer+Fractional synthesis

Low-Jitter, 10-Output, Any Frequency (<1028MHz), Any Output, Jitter Attenuator

Base blank prototyping device: Clock Generator:10-outputs up to 350 MHz;Integer+Fractional synthesis

4-Output Low Phase Noise Jitter Attenuating Clock Generator

SI5344、SI5344B-D、SI5344B-Dxxxxx-GM系列

Factory pre-programmed: Single PLL Jitter Attenuator, 4-outputs up to 350 MHz, Integer+Fractional synthesis .

44-QFN

The Si5345-EVB is used for evaluating the Si5345Any-Frequency, Any-Output, Jitter-Attenuating ClockMultiplier.

Evaluation Board

Si5348-E、Si5348系列

Si5348 Network Synchronizer Clock Development Kit. Si5348 Evaluation Board;

现场程序设计工具适配器 USB 线、两头带插孔的带状电缆.两头带插孔的跳线.

CBPROG-DONGLE系列

系统内或插槽内现场编程适配器. 现场程序设计工具适配器 USB 线.两头带插孔的带状电缆.两头带插孔的跳线. ClockBuilder Pro 现场程序设计工具 . 应用于系统内或插槽内现场编程的Si5332和Si534x/8x现场编程器. 频点定制.时钟定制.可编程服务。