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FS6131-01TR PDF预览

FS6131-01TR

更新时间： 2024-02-28 11:02:47
品牌 Logo 应用领域
安森美 - ONSEMI 时钟发生器光电二极管
页数 文件大小 规格书
44页 757K
描述
IC,MISCELLANEOUS CLOCK GENERATOR,CMOS,SOP,16PIN,PLASTIC

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FS6131-01TR 技术参数

生命周期：Transferred包装说明：SOP, SOP16,.25
Reach Compliance Code：unknown风险等级：5.8
JESD-30 代码：R-PDSO-G16端子数量：16
最高工作温度：70 °C最低工作温度：
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP16,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE电源：5 V
认证状态：Not Qualified子类别：Clock Generators
标称供电电压：5 V表面贴装：YES
技术：CMOS温度等级：COMMERCIAL
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUALBase Number Matches：1

FS6131-01TR 数据手册

 浏览型号FS6131-01TR的Datasheet PDF文件第7页浏览型号FS6131-01TR的Datasheet PDF文件第8页浏览型号FS6131-01TR的Datasheet PDF文件第9页浏览型号FS6131-01TR的Datasheet PDF文件第11页浏览型号FS6131-01TR的Datasheet PDF文件第12页浏览型号FS6131-01TR的Datasheet PDF文件第13页 
FS6131  
varying the voltage on the XTUNE pin. The total change (from one extreme to the other) in effective loading capacitance is 1.5pF  
nominal, and the effect is shown in Error! Reference source not found.. The oscillator operates the crystal resonator in the parallel-  
resonant mode. Crystal warping, or the "pulling" of the crystal oscillation frequency, is accomplished by altering the effective load  
capacitance presented to the crystal by the oscillator circuit. The actual amount that changing the load capacitance alters the oscillator  
frequency will be dependent on the characteristics of the crystal as well as the oscillator circuit itself.  
The motional capacitance of the crystal (usually referred to by crystal manufacturers as C  
and the load capacitance (C ) of the oscillator determine the warping capability of the crystal in the oscillator circuit. A simple formula to  
determine the total warping capability of a crystal is  
1
), the static capacitance of the crystal (C )  
0
L
6
×
(
−
)
)
×
+
C1 CL2 CL1 10  
Δf ( ppm) =  
2×  
(
+
×
(
)
C0 CL2 C0 CL1  
where CL1 and CL2 are the two extremes of the applied load capacitance obtained from Table 11.  
Example: A crystal with the following parameters is used with the FS6131. The total coarse tuning range is:  
C1  
=0.02pF, C =5.0pF, CL1=10.0pF, CL2=22.66pF  
0
0.02×  
(
22.66 −10  
)
×106  
Δf =  
= 305ppm  
2×  
(
5 + 22.66 5 +10  
)
×
(
)
4.4.1. VCXO Tuning  
The VCXO may be coarse tuned by a programmable adjustment of the crystal load capacitance via the XCT[3:0] control bits. See Table  
11 for the control code and the associated loading capacitance.  
The actual amount of frequency warping caused by the tuning capacitance will depend on the crystal used. The VCXO tuning  
capacitance includes an external 6pF load capacitance (12pF from the XIN pin to ground and 12pF from the XOUT pin to ground). The  
fine tuning capability of the VCXO can be enabled by setting the XLVTEN bit to a one, or disabled by setting it to a zero.  
Error! Reference source not found. shows the typical effect of the coarse and fine tuning mechanisms. The total coarse tune range is  
about 350ppm. The difference in VCXO frequency in parts per million (ppm) is shown as the fine tuning voltage on the XTUNE pin  
varies from 0V to 5V. Note that as the crystal load capacitance is increased the VCXO frequency is pulled somewhat less with each  
coarse step, and the fine tuning range decreases. The fine tuning range always overlaps a few coarse tuning ranges, eliminating the  
possibility of holes in the VCXO response. The different crystal warping characteristics may change the scaling on the Y-axis, but not  
the overall characteristic of the curves.  
VCXO Range (ppm) vs. XTUNE Voltage (V)  
200  
150  
XTUNE Voltage = 0.0V  
100  
50  
XTUNE Voltage = 5.0V  
0
-50  
-100  
-150  
-200  
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15  
Coarse Tune Setting XCT[3:0]  
Figure 11: VCXO Course and Fine Tuning  
Rev. 4 | Page 10 of 44 | www.onsemi.com  
1...78910111213...44

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