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LMH6720MAX

更新时间： 2024-01-24 12:10:09
品牌 Logo 应用领域
美国国家半导体 - NSC 运算放大器放大器电路光电二极管
页数 文件大小 规格书
15页 594K
描述
Wideband Video Op Amp; Single, Single with Shutdown and Quad

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中文翻译

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LMH6720MAX 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

LMH6720MAX 数据手册

 浏览型号LMH6720MAX的Datasheet PDF文件第7页浏览型号LMH6720MAX的Datasheet PDF文件第8页浏览型号LMH6720MAX的Datasheet PDF文件第9页浏览型号LMH6720MAX的Datasheet PDF文件第11页浏览型号LMH6720MAX的Datasheet PDF文件第12页浏览型号LMH6720MAX的Datasheet PDF文件第13页 
Application Section (Continued)  
to be avoided. See Application Notes OA-7 and OA-26 for  
more information on Active Filter applications for Current  
Feedback Op Amps.  
20056524  
FIGURE 5. Typical Application with Suggested Supply  
Bypassing  
20056521  
FIGURE 4. Enable/Disable Operation  
LAYOUT CONSIDERATIONS  
Whenever questions about layout arise, use the evaluation  
board as a guide. The following Evaluation boards are avail-  
able with sample parts:  
ENABLE/DISABLE OPERATION USING 5V SUPPLIES  
(LMH6720 ONLY)  
The LMH6720 has a TTL logic compatible disable function.  
<
Apply a logic low ( .8V) to the DS pin and the LMH6720 is  
LMH6714  
LMH6720  
LMH6722  
SOT  
CLC730216  
CLC730227  
CLC730216  
CLC730227  
CLC730231  
>
disabled. Apply a logic high ( 2.0V), or let the pin float and  
SOIC  
SOT  
the LMH6720 is enabled. Voltage, not current, at the Disable  
pin determines the enable/disable state. Care must be exer-  
cised to prevent the disable pin voltage from going more  
than .8V below the midpoint of the supply voltages (0V with  
split supplies, VCC/2 with single supplies) doing so could  
cause transistor Q1 to Zener resulting in damage to the  
disable circuit. The core amplifier is unaffected by this, but  
disable operation could become slower as a result.  
SOIC  
SOIC  
To reduce parasitic capacitances, the ground plane should  
be removed near the input and output pins. To reduce series  
inductance, trace lengths of components in the feedback  
loop should be minimized. For long signal paths controlled  
impedance lines should be used, along with impedance  
matching at both ends.  
Disabled, the LMH6720 inputs and output become high im-  
pedances. While disabled the LMH6720 quiescent current is  
approximately 500µA. Because of the pull up resistor on the  
disable circuit the ICC and IEE currents are not balanced in  
the disabled state. The positive supply current (ICC) is ap-  
proximately 500µA while the negative supply current (IEE) is  
only 200µA. The remaining IEE current of 300µA flows  
through the disable pin.  
Bypass capacitors should be placed as close to the device  
as possible. Bypass capacitors from each rail to ground are  
applied in pairs. The larger electrolytic bypass capacitors  
can be located anywhere on the board, the smaller ceramic  
capacitors should be placed as close to the device as pos-  
sible. In addition Figure 2 shows a capacitor (C1) across the  
supplies with no connection to ground. This capacitor is  
optional, however it is required for best 2nd Harmonic sup-  
pression. If this capacitor is omitted C2 and C3 should be  
increased to .1µF each.  
The disable function can be used to create analog switches  
or multiplexers. Implement a single analog switch with one  
LMH6720 positioned between an input and output. Create  
an analog multiplexer with several LMH6720’s. The  
LMH6720 is at it’s best at a gain of 1 for multiplexer appli-  
cations because there is no RG to shunt signals to ground.  
VIDEO PERFORMANCE  
DISABLE LIMITATIONS (LMH6720 ONLY)  
The LMH6714/6720/6722 has been designed to provide ex-  
cellent performance with both PAL and NTSC composite  
video signals. Performance degrades as the loading is in-  
creased, therefore best performance will be obtained with  
back terminated loads. The back termination reduces reflec-  
tions from the transmission line and effectively masks ca-  
pacitance from the amplifier output stage. While all parts  
offer excellent video performance the LMH6714 and  
LMH6722 are slightly better than the LMH6720.  
The feedback Resistor (RF) limits off isolation in inverting  
gain configurations. During shutdown the impedance of the  
LMH6720 inputs and output become very high ( 1MΩ),  
however RF and RG are the dominant factor for effective  
output impedance.  
>
Do not apply voltages greater than +VCC or less than 0V  
(VCC/2 single supply) to the disable pin. The input ESD  
diodes will also conduct if the signal leakage through the  
feedback resistors brings the inverting input near either sup-  
ply rail.  
www.national.com  
10  
1...78910111213...15

中文翻译

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