Datasheet Linear Technology LTC6945 — 数据表

制造商	Linear Technology
系列	LTC6945

超低噪声和杂散0.35GHz至6GHz Integer-N合成器

数据表

PDF, 382 Kb, 修订版: A, 文件上传: Nov 17, 2017

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打包

	LTC6945IUFD#PBF	LTC6945IUFD#TRPBF
N	1	2
Package	4x5 QFN-28 包装外形图	4x5 QFN-28 包装外形图
Package Code	UFD	UFD
Package Index	05-08-1712	05-08-1712
Pin Count	28	28

参数化

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

生态计划

	LTC6945IUFD#PBF	LTC6945IUFD#TRPBF
RoHS	Compliant	Compliant

应用须知

下载
A Simple Method to Accurately Predict PLL Reference Spur Levels Due to Leakage Current &mdash AN143
PDF, 256 Kb, 档案已发布: 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 …

模型线

系列: LTC6945 (2)

LTC6945IUFD#PBF LTC6945IUFD#TRPBF

制造商分类

Timing > PLL Synthesizers & VCOs > Integer-N PLLs

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