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MAX972CUA-T PDF预览

MAX972CUA-T

更新时间: 2024-10-28 13:01:19
品牌 Logo 应用领域
美信 - MAXIM 比较器
页数 文件大小 规格书
17页 324K
描述
Comparator, 2 Func, 10000uV Offset-Max, 300000ns Response Time, PDSO8, MICRO, SOP-8

MAX972CUA-T 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:SOIC
包装说明:MICRO, SOP-8针数:8
Reach Compliance Code:not_compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.14
Is Samacsys:N放大器类型:COMPARATOR
最大输入失调电压:10000 µVJESD-30 代码:S-PDSO-G8
JESD-609代码:e0湿度敏感等级:1
负供电电压上限:标称负供电电压 (Vsup):
功能数量:2端子数量:8
最高工作温度:70 °C最低工作温度:
输出类型:OPEN-DRAIN封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装等效代码:TSSOP8,.19
封装形状:SQUARE封装形式:SMALL OUTLINE
峰值回流温度(摄氏度):245电源:+-1.25/+-5.5/2.5/11 V
认证状态:Not Qualified标称响应时间:300000 ns
子类别:Comparator最大压摆率:0.0038 mA
供电电压上限:12 V标称供电电压 (Vsup):3 V
表面贴装:YES温度等级:COMMERCIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:GULL WING
端子节距:0.635 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIEDBase Number Matches:1

MAX972CUA-T 数据手册

 浏览型号MAX972CUA-T的Datasheet PDF文件第8页浏览型号MAX972CUA-T的Datasheet PDF文件第9页浏览型号MAX972CUA-T的Datasheet PDF文件第10页浏览型号MAX972CUA-T的Datasheet PDF文件第12页浏览型号MAX972CUA-T的Datasheet PDF文件第13页浏览型号MAX972CUA-T的Datasheet PDF文件第14页 
Ultra-Low-Power, Open-Drain,  
Single/Dual-Supply Comparators  
__________Applications Information  
V+  
Hysteresis  
Hysteresis increases the comparatorsnoise margin by  
increasing the upper threshold and decreasing the  
lower threshold (Figure 2).  
R
H
R
PULLUP  
V
IN  
Hysteresis (MAX9_1/MAX982/MAX9_3)  
To add hysteresis to the MAX9_1, MAX982, or MAX9_3,  
connect resistor R1 between REF and HYST, and  
connect resistor R2 between HYST and V- (Figure 3). If  
no hysteresis is required, connect HYST to REF. When  
hysteresis is added, the upper threshold increases by  
the same amount that the lower threshold decreases.  
The hysteresis band (the difference between the upper  
and lower thresholds, VHB) is approximately equal to  
twice the voltage between REF and HYST. The HYST  
input can be adjusted to a maximum voltage of REF  
and to a minimum voltage of (REF - 50mV). The  
maximum difference between REF and HYST (50mV)  
will therefore produce a 100mV (max) hysteresis band.  
Use the following equations to determine R1 and R2:  
V+ OUT  
V-  
MAX9_4  
GND  
V
REF  
Figure 4. External Hysteresis  
Board Layout and Bypassing  
Power-supply bypass capacitors are not needed if the  
supply impedance is low, but 100nF bypass capacitors  
should be used when the supply impedance is high or  
when the supply leads are long. Minimize signal lead  
lengths to reduce stray capacitance between the input  
and output that might cause instability. Do not bypass  
the reference output.  
V
HB  
R1 =  
2 × I  
(
)
REF  
V
HB  
2
1.182 –  
R2 =  
I
REF  
Window Detector  
The MAX9_3 is ideal for making window detectors  
(undervoltage/overvoltage detectors). The schematic is  
shown in Figure 5, with component values selected for a  
4.5V undervoltage threshold and a 5.5V overvoltage  
threshold. Choose different thresholds by changing the  
values of R1, R2, and R3. To prevent chatter at the  
output when the supply voltage is close to a threshold,  
hysteresis has been added using R4 and R5. Taken  
alone, OUTA would provide an active-low undervoltage  
indication, and OUTB would give an active-low  
overvoltage indication. Wired-ORing the two outputs  
provides an active-high, power-good signal.  
where IREF (the current sourced by the reference)  
should not exceed the REF source capability, and  
should be significantly larger than the HYST input  
current. IREF values between 0.1µA and 4µA are usually  
appropriate. If 2.4Mis chosen for R2 (IREF = 0.5µA),  
the equation for R1 and VHB can be approximated as:  
R1 (k) = V (mV)  
HB  
When hysteresis is obtained in this manner for the  
MAX982/MAX9_3, the same hysteresis applies to both  
comparators.  
Hysteresis (MAX972/MAX9_4)  
Hysteresis can be implemented with any comparator  
using positive feedback, as shown in Figure 4. This  
approach generally draws more current than circuits  
using the HYST pin on the MAX9_1/MAX982/MAX9_3,  
and the high feedback impedance slows hysteresis. In  
addition, because the output does not source current,  
any increase in the upper threshold is dependent on  
the load or pullup resistor on the output.  
The design procedure is as follows:  
1) Choose the required hysteresis level and calculate  
values for R4 and R5 according to the formulas in  
the Hysteresis (MAX9_1/MAX982/MAX9_3) section.  
In this example, 5mV of hysteresis has been added  
at the comparator input (VH = VHB/2). This means  
that the hysteresis apparent at VIN will be larger  
because of the input resistor divider.  
______________________________________________________________________________________ 11  

MAX972CUA-T 替代型号

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完全替代

Comparator, 2 Func, 10000uV Offset-Max, 300000ns Response Time, PDSO8, MICRO, SOP-8
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完全替代

Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators

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