LTC6951 - Ultralow Jitter Multi-Output Clock Synthesizer with Integrated VCO

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.

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

Applications

High Performance Data Converter Clocking
Wireless Infrastructure
Test and Measurement

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC6951IUHF-1#PBF	5x7 QFN-40	I	$12.50	$8.75
LTC6951IUHF-1#TRPBF	5x7 QFN-40	I	$12.56	$8.81
LTC6951IUHF#PBF	5x7 QFN-40	I	$12.50	$8.75
LTC6951IUHF#TRPBF	5x7 QFN-40	I	$12.56	$8.81

Demo Boards


Part Number	Description	Price
DC2226A-A	4-Channel 14-bit 250Msps JESD204B ADC with Clocking [Featuring LTC2123, LTC6951]	$300.00
DC2248A-A	LTC6951 Demo \| 5-Output Integer-N PLL with Integrated VCO, Output Range: 1.95MHz to 2.5GHz (requires DC590 or DC2026)	$300.00
DC2248A-B	LTC6951-1 Demo \| 5-Output Integer-N PLL with Integrated VCO, Output Range: 2.1MHz to 2.7GHz (requires DC590 or DC2026)	$300.00

**Companion Boards**
Part Number	Description	Price
DC2159A	FMC to USB Adapter to Interface with PScope	$50.00
DC2430A	DC2430A Linduino SPI 1:8 Expander Demonstration Board (DC2026 Included)	Contact Factory
DC2026C	Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform	$75.00
DC590B	Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards	$50.00