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MAX998EUT+

更新时间： 2024-02-06 10:59:40
品牌 Logo 应用领域
美信 - MAXIM 比较器
页数 文件大小 规格书
11页 219K
描述
Comparator, 1 Func, 3000uV Offset-Max, 28ns Response Time, CMOS, PDSO6, SOT-23, 6 PIN

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MAX998EUT+ 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：SOT-23, MO-178AB, 6 PIN针数：6
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.59
放大器类型：COMPARATOR最大平均偏置电流 (IIB)：0.3 µA
25C 时的最大偏置电流 (IIB)：0.3 µA最大输入失调电压：3000 µV
JESD-30 代码：R-PDSO-G6JESD-609代码：e0
长度：2.9 mm湿度敏感等级：1
功能数量：1端子数量：6
最高工作温度：85 °C最低工作温度：-40 °C
输出类型：PUSH-PULL封装主体材料：PLASTIC/EPOXY
封装代码：LSSOP封装等效代码：TSOP6,.11,37
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：245电源：3/5 V
认证状态：Not Qualified标称响应时间：28 ns
座面最大高度：1.45 mm子类别：Comparator
最大压摆率：0.65 mA供电电压上限：6 V
标称供电电压 (Vsup)：5 V表面贴装：YES
技术：CMOS温度等级：INDUSTRIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.95 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：1.625 mm
Base Number Matches：1

MAX998EUT+ 数据手册

 浏览型号MAX998EUT+的Datasheet PDF文件第4页浏览型号MAX998EUT+的Datasheet PDF文件第5页浏览型号MAX998EUT+的Datasheet PDF文件第6页浏览型号MAX998EUT+的Datasheet PDF文件第8页浏览型号MAX998EUT+的Datasheet PDF文件第9页浏览型号MAX998EUT+的Datasheet PDF文件第10页 
Single/Dual/Quad, SOT23, Single-Supply,  
High-Speed, Low-Power Comparators  
Window Comparator  
V
CC  
R3  
The MAX976 is ideal for making a window detector  
(undervoltage/overvoltage detector). The schematic  
shown in Figure 3 uses a MAX6120 reference and com-  
ponent values selected for a 2.0V undervoltage thresh-  
old and a 2.5V overvoltage threshold. Choose different  
thresholds by changing the values of R1, R2, and R3.  
OUTA provides an active-low undervoltage indication,  
and OUTB gives an active-low overvoltage indication.  
ANDing the two outputs provides an active-high,  
power-good signal. The design procedure is as follows:  
R1  
0.1μF  
OUT  
V
IN  
V
CC  
R2  
GND  
MAX976  
MAX978  
MAX998  
V
REF  
1) Select R1. The leakage current into INB- is normally  
75nA, so the current through R1 should exceed  
1.0µA for the thresholds to be accurate. R1 values in  
the 50kΩ to 100kΩ range are typical.  
Figure 2. Additional Hysteresis  
2) Choose the hysteresis band required (V ). For this  
HB  
example, choose 100mV.  
2) Choose the overvoltage threshold (V  
) when V  
IN  
OTH  
is rising, and calculate R2 and R3 with the following  
formula:  
3) Calculate R1. R1 = R3 x (V / V ). Plugging in the  
HB  
CC  
values for this example,  
R
= R2 + R3 = R1 x [V  
/ (V  
+ V ) - 1]  
REF H  
R1 = 1.2MΩ x (100mV / 5.0V) = 24kΩ  
SUM  
OTH  
where V = 1/2V  
.
4) Choose the trip point for V rising. This is the  
IN  
HYST  
H
threshold voltage at which the comparator switches  
3) Choose the undervoltage threshold (V  
) when V  
IN  
UTH  
from low to high as V rises above the trip point. In  
IN  
this example, choose 3.0V.  
is falling, and calculate R2 with the following formula:  
R2 = (R1 + R ) x [(V - V ) / V ] - R1  
SUM  
REF  
H
UTH  
5) Calculate R2 as follows:  
where V = 1/2V  
.
H
HYST  
1
4) Calculate R3 with the following formula:  
R3 = (R ) - R2  
R2 =  
⎛
⎞
⎟
V
1
R1  
1
R3  
THR  
x R1  
SUM  
−
−
⎜
V
⎝
⎠
REF  
5) Verify the resistor values. The equations are as follows:  
1
V
V
= (V  
= (V  
+ V ) x (R1 + R2 + R3) / R1  
H
OTH  
UTH  
REF  
REF  
R2 =  
= 16.2kΩ  
⎛
⎜
⎞
3.0V  
1
1
1.2M  
- V ) x (R1 + R2 + R3) / (R1 + R2)  
H
−
−
⎟
⎝1.2 x 24kΩ⎠  
24kΩ  
R3  
82.1kΩ  
1%  
V
CC  
Choose a standard value for R2 of 16kΩ.  
6) Verify the trip voltage and hysteresis as follows:  
1
2
0.1μF  
V
IN  
8
1/2  
UNDERVOLTAGE  
R2  
24.9kΩ  
1%  
⎛
⎞
1
1
1
MAX976  
7
V
rising: V  
= V  
x R1 x  
+
+
IN  
THR  
REF  
⎜
⎝
⎟
⎠
5
V
CC  
R1  
R2  
R3  
1
⎛
⎞
R1 x V  
POWER GOOD  
CC  
V
falling: V  
= V  
−
IN  
THF  
THR  
⎜
⎝
⎟
⎠
R3  
3
4
2
MAX6120  
Hysteresis = V  
− V  
THF  
THR  
1/2  
6
OVERVOLTAGE  
MAX976  
IR Receiver  
3
The Typical Operating Circuit shows an application using  
the MAX998 as an infrared receiver. The infrared photo-  
diode creates a current relative to the amount of infrared  
R1  
100kΩ  
1%  
light present. This current creates a voltage across R .  
D
When this voltage level crosses the voltage applied by the  
voltage divider to the inverting input, the output transitions.  
Figure 3. Window Comparator  
_______________________________________________________________________________________  
7
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