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AS1713 参数 Datasheet PDF下载

AS1713图片预览
型号: AS1713
PDF下载: 下载PDF文件 查看货源
内容描述: 差分放大器的10MHz , 10V / μs的轨至轨I / O [Difference Amplifier, 10MHz, 10V/μs, Rail-to-Rail I/O]
分类和应用: 放大器
文件页数/大小: 15 页 / 1738 K
品牌: AMSCO [ AMS(艾迈斯) ]
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AS1713  
Data Sheet - Application Information  
8 Application Information  
Ground Loop Interference Suppression:  
In real life situations the signal source and the amplifier are often located a distance apart, but still share the same  
ground arrangement with a number of other circuits. The ground system is never perfect as it has a small distributed  
resistance, capacitance and inductance. Thus, the ground appears as a distributed impedance.  
As a various current flow into and out of the ground system exists, a small voltage drop will inevitably occur, causing  
different voltages within the ground. In Figure 23 and Figure 24, RGND denotes the ground resistance between the  
input signal ground and the output signal ground. The voltage drop across RGND should ideally have no effect on indi-  
vidual circuit performance.  
In the single ended inverting amplifier shown in Figure 23, the amplifier sees VIN and VGND in series, so the amplifier  
output is:  
VOUT = - [R2/R1] [VIN+VGND]  
(EQ 1)  
Figure 23. Single Ended Inverting Amplifier  
R1  
R2  
+
+
VIN  
+
VOUT  
-
RGND  
+ VGND -  
VGND is part of the output expression and is known as ground loop interference, ground bounce or even common  
impedance crosstalk. In some situations this interference signal can be close to or the same value as the wanted input  
signal such as in sensor applications.  
A difference amplifier is a simple method used to reduce the effect of ground interference. VIN is regarded as a differ-  
ential input signal, and VGND a common mode signal. From Figure 24, the amplifier output is:  
VOUT = - [R2/R1] VIN  
(EQ 2)  
Figure 24. Difference Amplifier  
R1  
INN  
R2  
SENSE  
AS1713  
EN  
+
VIN  
OUT  
REF  
+
R3  
R4  
INP  
+
VOUT  
-
RGND  
+ VGND -  
The additional cost of extra matched resistors is offset by the rejection of the unwanted common mode ground interfer-  
ence.  
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Revision 1.01  
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