Datasheet Linear Technology LTC6945

Manufacturer	Linear Technology
Series	LTC6945

Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer

Datasheets

PDF, 382 Kb, Revision: A, File uploaded: Nov 17, 2017

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Packaging

	LTC6945IUFD#PBF	LTC6945IUFD#TRPBF
N	1	2
Package	4x5 QFN-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing
Package Code	UFD	UFD
Package Index	05-08-1712	05-08-1712
Pin Count	28	28

Parametrics

Parameters / Models	LTC6945IUFD#PBF	LTC6945IUFD#TRPBF
Demo Boards	DC1649A-A	DC1649A-A
Design Tools	PLLWizard ,Linduino File	PLLWizard ,Linduino File
Export Control	no	no
Frequency Range	350MHz to 6GHz	350MHz to 6GHz
Isupply, mA	111	111
Normalized 1/f Phase Noise Floor, dBc/Hz	-274	-274
Normalized In-Band Phase Noise Int-N, dBc/Hz	-226	-226
Operating Temperature Range, °C	-40 to 85	-40 to 85
Output Divider Range	1 to 6	1 to 6
PFD, MHz	100	100
RF Frequency Max, MHz	6000	6000
RF Frequency Min, MHz	350	350
Reference Frequency Max, MHz	250	250
Reference Frequency Range	10MHz to 250MHz	10MHz to 250MHz
Reference Spur 900MHz, dBc	-111	-111
Supply Voltage Range	3.3V, 3.3V & 5V	3.3V, 3.3V & 5V
Type	Integer-N	Integer-N
VCO Frequency	350MHz to 6GHz	350MHz to 6GHz

Eco Plan

	LTC6945IUFD#PBF	LTC6945IUFD#TRPBF
RoHS	Compliant	Compliant

Application Notes

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A Simple Method to Accurately Predict PLL Reference Spur Levels Due to Leakage Current &mdash AN143
PDF, 256 Kb, File published: Dec 17, 2013
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Application Note 143
December 2013
A Simple Method to Accurately Predict PLL Reference
Spur Levels Due to Leakage Current
Michel Azarian and Will Ezell
Presented is a simple model that can be used to accurately
predict the level of reference spurs due to charge pump
and/or op amp leakage current in a PLL system. Knowing
how to predict these levels helps pick loop parameters
wisely during the early stages of a PLL system design.
Quick Review of PLLs
The phase locked loop (PLL) is a negative feedback system
that locks the phase and frequency of a higher frequency
device (usually a voltage controlled oscillator, VCO) whose
phase and frequency are not very stable over temperature
and time to a more stable and lower frequency device
(usually a temperature compensated or oven controlled
crystal oscillator, TCXO or OCXO). As a black box, the PLL
can be viewed as a frequency multiplier.
A PLL is employed when there is the need for a high
frequency local oscillator (LO) source. Example applications are numerous and include wireless communications,
medical devices and instrumentation.
Figure 1 shows the building blocks of a PLL system used …

Model Line

Series: LTC6945 (2)

LTC6945IUFD#PBF LTC6945IUFD#TRPBF

Manufacturer's Classification

Timing > PLL Synthesizers & VCOs > Integer-N PLLs

Related publications

Circuits A Simple Method to Accurately Predict PLL Reference Spur Levels Due to Leakage Current — LTC6945

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