MAX981

更新时间： 2024-02-05 04:09:43

品牌	Logo	应用领域
美信 - MAXIM		比较器
页数	文件大小	规格书
16页	111K
描述
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators

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技术参数
数据手册

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MAX981 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：	0.150 INCH, SOIC-8	针数：	8
Reach Compliance Code：	not_compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.33
放大器类型：	COMPARATOR	最大输入失调电压：	10000 µV
JESD-30 代码：	R-PDSO-G8	JESD-609代码：	e0
负供电电压上限：		标称负供电电压 (Vsup)：
功能数量：	1	端子数量：	8
最高工作温度：	85 °C	最低工作温度：	-40 °C
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：	SOP8,.25
封装形状：	RECTANGULAR	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：	INDUSTRIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED

MAX981 数据手册

Ult ra -Lo w -P o w e r, Op e n -Dra in ,

S in g le /Du a l-S u p p ly Co m p a ra t o rs

__________Ap p lic a t io n s In fo rm a t io n

V+

Hys t e re s is

Hysteresis increases the comparators’ noise margin by

increasing the upper threshold and decreasing the

lower threshold (Figure 2).

PULL-UP

Hysteresis (MAX9_1/MAX982/MAX9_3)

To add hysteresis to the MAX9_1, MAX982, or MAX9_3,

c onne c t re s is tor R1 b e twe e n REF a nd HYST, a nd

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

V+ OUT

V-

MAX9_4

GND

REF

and lower thresholds, V ) is approximately equal to

twice the voltage between REF and HYST. The HYST

input can be adjusted to a maximum voltage of REF

a nd to a minimum volta g e 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:

Figure 4. External Hysteresis

Bo a rd La yo u t a n d Byp a s s in g

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.

R1 =

2 × I

(

)

REF

1.182 –

R2 =

REF

Win d o w De t e c t o r

The MAX9_3 is id e a l for ma king wind ow d e te c tors

(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

ind ic a tion, a nd OUTB would g ive a n a c tive -low

overvoltage indication. Wired-ORing the two outputs

provides an active-high, power-good signal.

whe re I

(the c urre nt s ourc e d b y the re fe re nc e )

REF

s hould not e xc e e d the REF s ourc e c a p a b ility, a nd

s hould b e s ig nific a ntly la rg e r tha n the HYST inp ut

c urre nt.

usually appropriate. If 2.4MΩ is chosen for R2 (I

0.5µA), the e q ua tion for R1 a nd

approximated as:

va lue s b e twe e n 0.1µA a nd 4µA a re

REF

7/1–MAX984

c a n b e

R1 (kΩ) = V (mV)

Whe n hyste re sis is obta ine d in this ma nne r 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 pull-up 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 (V = V / 2). This means

that the hysteresis apparent at V will be larger

because of the input resistor divider.

10 ______________________________________________________________________________________

1...7 8 91011 12 13...16

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