Features

• Low Noise Integer-N PLL with Integrated VCO
• Output Jitter:
• 90fs RMS (12kHz to 20MHz)
• 115fs RMS (ADC SNR Method)
• Noise Floor = –165dBc/Hz at 250MHz
• EZSync™, ParallelSync™ Multichip Synchronization
• SYSREF Generation for JESD204B, Subclass 1
• Output Frequency Range:
• 1.95MHz to 2.5GHz (LTC6951)
• 2.1MHz to 2.7GHz (LTC6951-1)
• –229dBc/Hz Normalized In-Band Phase Noise Floor
• –277dBc/Hz Normalized In-Band 1/f Noise
• Five Independent, Low Noise Outputs
• Reference Input Frequency up to 425MHz
• LTC6951Wizard™ Software Design Tool Support
• –40°C to 105°C Operating Junction Temperature Range
• LTC6951Wizard Design Tool

Typical Application

Description

The LTC®6951 is a high performance, low noise, Phase Locked Loop (PLL) with a fully integrated VCO. The low noise VCO uses no external components and is internally calibrated to the correct output frequency with no external system support.

The clock generation section provides five outputs based on the VCO prescaler signal with individual dividers for each output. Four outputs feature very low noise, low skew CML logic. The fifth output is low noise LVDS. All outputs can be synchronized and set to precise phase alignment using the programmable delays.

Choose the LTC6951-1 if any desired output frequency falls in the ranges 2.5GHz to 2.7GHz, 1.66GHz to 1.8GHz, or 1.25GHz to 1.35GHz. Choose the LTC6951 for all other frequencies.