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LMV822MM 参数 Datasheet PDF下载

LMV822MM图片预览
型号: LMV822MM
PDF下载: 下载PDF文件 查看货源
内容描述: 单/双LMV822 / LMV824四路低电压,低功耗,R到R输出, 5 MHz的运算放大器 [Single/ LMV822 Dual/ LMV824 Quad Low Voltage, Low Power, R-to-R Output, 5 MHz Op Amps]
分类和应用: 运算放大器光电二极管
文件页数/大小: 26 页 / 1061 K
品牌: TI [ TEXAS INSTRUMENTS ]
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Application Note (Continued)  
10012854  
FIGURE 5. Pulse Response per Figure 4  
10012861  
INPUT BIAS CURRENT CONSIDERATION  
Input bias current (IB) can develop a somewhat significant  
offset voltage. This offset is primarily due to IB flowing  
through the negative feedback resistor, RF. For example, if IB  
FIGURE 2. Unity-Gain Frequency vs Common Mode  
Voltage for Various Loads  
@
is 90 nA (max room) and RF is 100 k, then an offset of 9  
UNITY GAIN PULSE RESPONSE CONSIDERATION  
mV will be developed (VOS=IBx RF).Using a compensation  
resistor (RC), as shown in Figure 6, cancels out this affect.  
But the input offset current (IOS) will still contribute to an  
offset voltage in the same manner - typically 0.05 mV at  
room temp.  
A pull-up resistor is well suited for increasing unity-gain,  
pulse response stability. For example, a 600 pull-up resis-  
tor reduces the overshoot voltage by about 50%, when  
driving a 220 pF load. Figure 3 shows how to implement the  
pull-up resistor for more pulse response stability.  
10012841  
FIGURE 3. Using a Pull-up Resistor at the Output for  
Stabilizing Capacitive Loads  
Higher capacitances can be driven by decreasing the value  
of the pull-up resistor, but its value shouldn’t be reduced  
beyond the sinking capability of the part. An alternate ap-  
proach is to use an isolation resistor as illustrated in Figure 4  
.
Figure 5 shows the resulting pulse response from a LMV824,  
while driving a 10,000 pF load through a 20isolation  
resistor.  
10012859  
FIGURE 6. Canceling the Voltage Offset Effect of Input  
Bias Current  
APPLICATION CIRCUITS  
10012843  
This section covers the following application circuits:  
1. Telephone-Line Transceiver  
FIGURE 4. Using an Isolation Resistor to Drive Heavy  
Capacitive Loads  
2. “Simple” Mixer (Amplitude Modulator)  
www.national.com  
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