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Схема очистки от джиттера сигнала синхронизации.


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Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LMK04821, LMK04826, LMK04828
SNAS605AQ ­ MARCH 2013 ­ REVISED AUGUST 2014 LMK0482x Ultra Low-Noise JESD204B Compliant Clock Jitter Cleaner with Dual Loop PLLs
1 Features 1 2 Applications Wireless Infrastructure Data Converter Clocking Networking, SONET/SDH, DSLAM Medical / Video / Military / Aerospace Test and Measurement JEDEC JESD204B Support Ultra-Low RMS Jitter ­ 88 fs RMS jitter (12 kHz to 20 MHz) ­ 91 fs RMS jitter (100 Hz to 20 MHz) ­ ­162.5 dBc/Hz Noise Floor at 245.76 MHz Up to 14 Differential Device Clocks from PLL2 ­ Up to 7 SYSREF Clocks ­ Maximum Clock Output Frequency 3.1 GHz ­ LVPECL, LVDS, HSDS, LCPECL Programmable Outputs from PLL2 Up to 1 Buffered VCXO/Crystal Output from PLL1 ­ LVPECL, LVDS, 2xLVCMOS Programmable Dual Loop PLLatinumTM PLL Architecture PLL1 ­ Up to 3 Redundant Input Clocks ­ Automatic and Manual Switch-over Modes ­ Hitless Switching and LOS ­ Integrated Low-Noise Crystal Oscillator Circuit ­ Holdover mode when Input Clocks are lost PLL2 ­ Normalized [1 Hz] PLL Noise Floor of -227 dBc/Hz ­ Phase Detector Rate up to 155 MHz ­ OSCin Frequency-doubler ­ Two Integrated Low-Noise VCOs 50% Duty Cycle Output Divides, 1 to 32 (even and odd) Precision Digital Delay, Dynamically Adjustable 25 ps Step Analog Delay Multi-mode: Dual PLL, single PLL, and Clock Distribution Industrial Temperature Range: -40 to 85°C 3.15 V to 3.45 V Operation Package: 64-pin QFN (9.0 x 9.0 x 0.8 mm) 3 Description
The LMK0482x family is the industry's highest performance clock conditioner with JEDEC JESD204B support. The 14 clock outputs from PLL2 can be configured to drive seven JESD204B converters or other logic devices using device and SYSREF clocks. SYSREF can be provided using both DC and AC coupling. Not limited to JESD204B applications, each of the 14 outputs can be individually configured as high performance outputs for traditional clocking systems. The ...

На английском языке: Datasheet Texas Instruments LMK04826BISQ/NOPB

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