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LMH6720MFX PDF预览

LMH6720MFX

更新时间： 2024-01-21 19:35:26
品牌 Logo 应用领域
德州仪器 - TI 运算放大器放大器电路光电二极管
页数 文件大小 规格书
30页 1561K
描述
LMH6714/ LMH6720/ LMH6722/ LMH6722Q Wideband Video Op Amp; Single, Single

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LMH6720MFX 技术参数

是否无铅：含铅是否Rohs认证：不符合
生命周期：Obsolete零件包装代码：SOT-23
包装说明：SOT-23, 6 PIN针数：6
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.33.00.01风险等级：5.74
Is Samacsys：N放大器类型：OPERATIONAL AMPLIFIER
JESD-30 代码：R-PDSO-G6JESD-609代码：e0
长度：2.92 mm湿度敏感等级：1
功能数量：1端子数量：6
封装主体材料：PLASTIC/EPOXY封装代码：LSSOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：260座面最大高度：1.22 mm
子类别：Operational Amplifier表面贴装：YES
技术：BIPOLAR温度等级：INDUSTRIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.953 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：1.6 mm
Base Number Matches：1

LMH6720MFX 数据手册

 浏览型号LMH6720MFX的Datasheet PDF文件第7页浏览型号LMH6720MFX的Datasheet PDF文件第8页浏览型号LMH6720MFX的Datasheet PDF文件第9页浏览型号LMH6720MFX的Datasheet PDF文件第11页浏览型号LMH6720MFX的Datasheet PDF文件第12页浏览型号LMH6720MFX的Datasheet PDF文件第13页 
LMH6714, LMH6720  
LMH6722, LMH6722-Q1  
SNOSA39G –NOVEMBER 2002–REVISED APRIL 2013  
www.ti.com  
APPLICATION SECTION  
FEEDBACK RESISTOR SELECTION  
One of the key benefits of a current feedback operational amplifier is the ability to maintain optimum frequency  
response independent of gain by using appropriate values for the feedback resistor (RF). The Electrical  
Characteristics and Typical Performance plots specify an RF of 300Ω, a gain of +2V/V and ±5V power supplies  
(unless otherwise specified). Generally, lowering RF from it's recommended value will peak the frequency  
response and extend the bandwidth while increasing the value of RF will cause the frequency response to roll off  
faster. Reducing the value of RF too far below it's recommended value will cause overshoot, ringing and,  
eventually, oscillation.  
1
0
-1  
R
= 147W  
F
-2  
-3  
-4  
-5  
-6  
-7  
-8  
R
= 300W  
F
R
= 400W  
F
R
F
= 600W  
A
V
= 2V/V  
V
= 0.5V  
OUT  
PP  
1
10  
100  
1000  
FREQUENCY (MHz)  
Figure 31. Frequency Response vs. RF  
Figure 31 shows the LMH6714/LMH6720/LMH6722's frequency response as RF is varied (RL = 100Ω, AV = +2).  
This plot shows that an RF of 147Ω results in peaking. An RF of 300Ω gives near maximal bandwidth and gain  
flatness with good stability. An RF of 400Ω gives excellent stability with only a small bandwidth penalty. Since all  
applications are slightly different it is worth some experimentation to find the optimal RF for a given circuit. Note  
that it is not possible to use a current feedback amplifier with the output shorted directly to the inverting input.  
The buffer configuration of the LMH6714/LMH6720/LMH6722 requires a 600Ω feedback resistor for stable  
operation.  
For more information see Application Note OA-13 (SNOA366) which describes the relationship between RF and  
closed-loop frequency response for current feedback operational amplifiers. The value for the inverting input  
impedance for the LMH6714/LMH6720/LMH6722 is approximately 180Ω. The LMH6714/LMH6720/LMH6722 is  
designed for optimum performance at gains of +1 to +6 V/V and −1 to −5V/V. When using gains of ±7V/V or  
more the low values of RG required will make inverting input impedances very low.  
When configuring the LMH6714/LMH6720/LMH6722 for gains other than +2V/V, it is usually necessary to adjust  
the value of the feedback resistor. Figure 32 and Figure 33 provide recommended feedback resistor values for a  
number of gain selections.  
700  
600  
500  
400  
300  
200  
100  
0
1
2
3
4
5
6
7
8
9
10  
GAIN (V/V)  
Figure 32. RF vs. Non-Inverting Gain  
10  
Submit Documentation Feedback  
Copyright © 2002–2013, Texas Instruments Incorporated  
Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1  
 
 
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