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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  
4.4  
Externally Set Hysteresis  
25  
20  
15  
10  
5
VDD = 5.0V  
Greater flexibility in selecting hysteresis (or input trip  
points) is achieved by using external resistors.  
VIN–  
5
Input offset voltage (VOS) is the center (average) of the  
(input-referred) low-high and high-low trip points. Input  
hysteresis voltage (VHYST) is the difference between  
the same trip points. Hysteresis reduces output  
chattering when one input is slowly moving past the  
other and thus reduces dynamic supply current. It also  
helps in systems where it is best not to cycle between  
states too frequently (e.g., air conditioner thermostatic  
control).  
VOUT  
4
3
0
2
-5  
Hysteresis  
1
-10  
-15  
-20  
-25  
-30  
0
Time (100 ms/div)  
FIGURE 4-3:  
comparators’ internal hysteresis eliminates  
output chatter caused by input noise voltage.  
The MCP6541/2/3/4  
4.4.1  
NON-INVERTING CIRCUIT  
Figure 4-4 shows a non-inverting circuit for single-  
supply applications using just two resistors. The  
resulting hysteresis diagram is shown in Figure 4-5.  
4.2  
Push-Pull Output  
The push-pull output is designed to be compatible with  
CMOS and TTL logic, while the output transistors are  
configured to give rail-to-rail output performance. They  
are driven with circuitry that minimizes any switching  
current (shoot-through current from supply-to-supply)  
when the output is transitioned from high-to-low, or from  
low-to-high (see Figures 2-15, 2-18, 2-32 through 2-36  
for more information).  
VDD  
VREF  
-
VOUT  
MCP654X  
+
VIN  
R1  
RF  
Non-inverting circuit with  
4.3  
MCP6543 Chip Select (CS)  
The MCP6543 is a single comparator with Chip Select  
(CS). When CS is pulled high, the total current  
consumption drops to 20 pA (typ.); 1 pA (typ.) flows  
through the CS pin, 1 pA (typ.) flows through the out-  
put pin and 18 pA (typ.) flows through the VDD pin, as  
shown in Figure 1-1. When this happens, the  
comparator output is put into a high-impedance state.  
By pulling CS low, the comparator is enabled. If the CS  
pin is left floating, the comparator will not operate  
properly. Figure 1-1 shows the output voltage and  
supply current response to a CS pulse.  
FIGURE 4-4:  
hysteresis for single-supply.  
VOUT  
VDD  
VOH  
High-to-Low  
Low-to-High  
VIN  
VOL  
VSS  
The internal CS circuitry is designed to minimize  
glitches when cycling the CS pin. This helps conserve  
power, which is especially important in battery-powered  
applications.  
VSS  
VTHL VTLH  
VDD  
FIGURE 4-5:  
Hysteresis Diagram for the  
Non-Inverting Circuit.  
The trip points for Figures 4-4 and 4-5 are:  
EQUATION 4-1:  
R
R
1
1
------  
V
= V  
1 +------ V  
TLH  
REF  
OL  
R
R
F
F
R
R
1
1
------  
V
= V  
1 +------ V  
THL  
REF  
OH  
R
F
R
F
VTLH = trip voltage from low to high  
VTHL = trip voltage from high to low  
© 2006 Microchip Technology Inc.  
DS21696E-page 15  
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