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MCP6542-I/SN 参数 Datasheet PDF下载

MCP6542-I/SN图片预览
型号: MCP6542-I/SN
PDF下载: 下载PDF文件 查看货源
内容描述: 推挽输出亚微安比较 [Push-Pull Output Sub-Microamp Comparators]
分类和应用: 比较器放大器放大器电路光电二极管PC
文件页数/大小: 34 页 / 1169 K
品牌: MICROCHIP [ MICROCHIP ]
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MCP6541/1R/1U/2/3/4  
4.8  
PCB Surface Leakage  
4.9  
Unused Comparators  
In applications where low input bias current is critical,  
PCB (Printed Circuit Board) surface leakage effects  
need to be considered. Surface leakage is caused by  
humidity, dust or other contamination on the board.  
Under low humidity conditions, a typical resistance  
between nearby traces is 1012Ω. A 5V difference would  
cause 5 pA of current to flow. This is greater than the  
MCP6541/1R/1U/2/3/4 family’s bias current at 25°C  
(1 pA, typ.).  
An unused amplifier in a quad package (MCP6544)  
should be configured as shown in Figure 4-10. This  
circuit prevents the output from toggling and causing  
crosstalk. It uses the minimum number of components  
and draws minimal current (see Figure 2-15 and  
Figure 2-18).  
¼ MCP6544  
VDD  
The easiest way to reduce surface leakage is to use a  
guard ring around sensitive pins (or traces). The guard  
ring is biased at the same voltage as the sensitive pin.  
An example of this type of layout is shown in  
Figure 4-9.  
+
VIN-  
VIN+  
VSS  
FIGURE 4-10:  
Unused Comparators.  
Guard Ring  
Example Guard Ring Layout  
FIGURE 4-9:  
for Inverting Circuit.  
1. Inverting Configuration (Figures 4-6 and 4-9):  
a. Connect the guard ring to the non-inverting  
input pin (VIN+). This biases the guard ring  
to the same reference voltage as the  
comparator (e.g., VDD/2 or ground).  
b. Connect the inverting pin (VIN–) to the input  
pad without touching the guard ring.  
2. Non-inverting Configuration (Figure 4-4):  
a. Connect the non-inverting pin (VIN+) to the  
input pad without touching the guard ring.  
b. Connect the guard ring to the inverting input  
pin (VIN–).  
© 2006 Microchip Technology Inc.  
DS21696E-page 17  
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