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MAX987

更新时间： 2024-02-05 03:16:25
品牌 Logo 应用领域
美信 - MAXIM 比较器
页数 文件大小 规格书
12页 143K
描述
High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators

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MAX987 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：SC-70, 5 PIN针数：5
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.56
Is Samacsys：N放大器类型：COMPARATOR
最大平均偏置电流 (IIB)：0.01 µA最大输入失调电压：7000 µV
JESD-30 代码：R-PDSO-G5JESD-609代码：e0
长度：2 mm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：1端子数量：5
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：TSSOP封装等效代码：TSSOP5/6,.08
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：245电源：+-1.5/+-2.5/3/5 V
认证状态：Not Qualified标称响应时间：210 ns
座面最大高度：1.1 mm子类别：Comparator
最大压摆率：0.096 mA供电电压上限：6 V
标称供电电压 (Vsup)：2.7 V表面贴装：YES
技术：BIPOLAR温度等级：INDUSTRIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：1.25 mm
Base Number Matches：1

MAX987 数据手册

 浏览型号MAX987的Datasheet PDF文件第5页浏览型号MAX987的Datasheet PDF文件第6页浏览型号MAX987的Datasheet PDF文件第7页浏览型号MAX987的Datasheet PDF文件第9页浏览型号MAX987的Datasheet PDF文件第10页浏览型号MAX987的Datasheet PDF文件第11页 
Hig h -S p e e d , Mic ro p o w e r, Lo w -Vo lt a g e ,  
S OT2 3 , Ra il-t o -Ra il I/O Co m p a ra t o rs  
_______________De t a ile d De s c rip t io n  
__________Ap p lic a t io n s In fo rm a t io n  
The MAX987/MAX988/MAX991/MAX992/MAX995/  
MAX996 are single/dual/quad low-power, low-voltage  
comparators. They have an operating supply voltage  
range between +2.5V and +5.5V and consume only  
48µA per comparator, while achieving 120ns propaga-  
tion delay. Their common-mode input voltage range  
extends 0.25V beyond each rail. Internal hysteresis  
ensures clean output switching, even with slow-moving  
input signals. Large internal output drivers allow rail-to-  
rail output swing with up to 8mA loads.  
Ad d it io n a l Hys t e re s is  
MAX987/MAX991/MAX995  
The MAX987/MAX991/MAX995 have ±2.5mV internal  
hysteresis. Additional hysteresis can be generated with  
thre e re s is tors us ing p os itive fe e d b a c k (Fig ure 1).  
Unfortuna te ly, this me thod a ls o s lows hys te re s is  
response time. Use the following procedure to calcu-  
late resistor values for the MAX987/MAX991/MAX995.  
1) Select R3. Leakage current at IN is under 10nA;  
therefore, the current through R3 should be at least  
1µA to minimize errors caused by leakage current.  
The output stage employs a unique design that mini-  
mizes supply-current surges while switching, virtually  
eliminating the supply glitches typical of many other  
comparators. The MAX987/MAX991/MAX995 have a  
push/pull output structure that sinks as well as sources  
current. The MAX988/MAX992/MAX996 have an open-  
The current through R3 at the trip point is (V  
-
REF  
V
) / R3. Considering the two possible output  
OUT  
states and solving for R3 yields two formulas: R3 =  
/ 1µA or R3 = (V - V ) / 1µA. Use the  
V
REF  
REF  
CC  
s ma lle r of the two re s ulting re s is tor va lue s . For  
example, if V = 1.2V and V = 5V, then the two  
drain output stage that can be pulled beyond V to an  
CC  
REF  
CC  
absolute maximum of 6V above V  
.
EE  
R3 resistor values are 1.2MΩ and 3.8MΩ. Choose a  
1.2MΩ standard value for R3.  
In p u t S t a g e Circ u it ry  
The devices’ input common-mode range extends from  
2) Choose the hysteresis band required (V ). For this  
HB  
-0.25V to (V + 0.25V). These comparators may oper-  
CC  
example, choose 50mV.  
ate at any differential input voltage within these limits.  
Input bias current is typically 1.0pA if the input voltage  
is between the supply rails. Comparator inputs are pro-  
tected from overvoltage by internal body diodes con-  
nected to the supply rails. As the input voltage exceeds  
the supply rails, these body diodes become forward  
biased and begin to conduct. Consequently, bias cur-  
re nts inc re a s e e xp one ntia lly a s the inp ut volta g e  
exceeds the supply rails.  
3) Calculate R1 according to the following equation:  
R1 = R3 x (V / V  
)
HB  
CC  
For this example, insert the values R1 = 1.2MΩ x  
(50mV / 5V) = 12kΩ.  
4) Choose the trip point for V rising (V  
; V  
is  
IN  
THR  
THF  
the trip point for V falling). This is the threshold  
IN  
voltage at which the comparator switches its output  
from low to high as V rises above the trip point. For  
IN  
Ou t p u t S t a g e Circ u it ry  
The s e c omp a ra tors c onta in a uniq ue outp ut s ta g e  
capable of rail-to-rail operation with up to 8mA loads.  
Many comparators consume orders of magnitude more  
current during switching than during steady-state oper-  
ation. However, with this family of comparators, the  
supply-current change during an output transition is  
extremely small. The Typical Operating Characteristics  
graph Supply Current vs. Output Transition Frequency  
shows the minimal supply-current increase as the out-  
put switching frequency approaches 1MHz. This char-  
acteristic eliminates the need for power-supply filter  
capacitors to reduce glitches created by comparator  
switching currents. Battery life increases substantially  
in high-speed, battery-powered applications.  
this example, choose 3V.  
V
CC  
R3  
R1  
0.1µF  
V
IN  
V
CC  
OUT  
R2  
V
EE  
MAX987  
MAX991  
MAX995  
V
REF  
78125/MAX96  
Figure 1. Additional Hysteresis (MAX987/MAX991/MAX995)  
8
_______________________________________________________________________________________  
1...56789101112

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