Datasheet > MAX986EXK+

MAX986EXK+

更新时间： 2024-02-10 11:23:45

品牌	Logo	应用领域
美信 - MAXIM		放大器光电二极管
页数	文件大小	规格书
13页	447K
描述
Comparator, 1 Func, 7000uV Offset-Max, PDSO5, SC-70, 5 PIN

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MAX986EXK+ 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	TSSOP,
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.74
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-G5
JESD-609代码：	e3	长度：	2 mm
湿度敏感等级：	1	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：	OPEN-DRAIN
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	NOT SPECIFIED	座面最大高度：	1.1 mm
子类别：	Comparator	供电电压上限：	6 V
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
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

MAX986EXK+ 数据手册

Micropower, Low-Voltage, UCSP/SC70,

Rail-to-Rail I/O Comparators

_______________Detailed Description

The MAX985/MAX986/MAX989/MAX990/MAX993/

MAX994 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 11µA.

Their common-mode input voltage range extends 0.25V

beyond each rail. Internal hysteresis ensures clean out-

put switching, even with slow-moving input signals.

Large internal output drivers allow rail-to-rail output

swing with up to 8mA loads.

OUT

MAX985

MAX989

MAX993

REF

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 MAX985/MAX989/MAX993 have a

push-pull output structure that sinks as well as sources

current. The MAX986/MAX990/MAX994 have an open-

Figure 1. Additional Hysteresis (MAX985/MAX989/MAX993)

drain output stage that can be pulled beyond V

to an

absolute maximum of 6V above V

__________Applications Information

Input Stage Circuitry

The devices’ input common-mode range extends from

Additional Hysteresis

-0.25V to (V

+ 0.25V). These comparators may oper-

MAX985/MAX989/MAX993

The MAX985/MAX989/MAX993 have 3mV internal

hysteresis. Additional hysteresis can be generated with

three resistors using positive feedback (Figure 1).

Unfortunately, this method also slows hysteresis

response time. Use the following procedure to calcu-

late resistor values for the MAX985/MAX989/MAX993.

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-

rents increase exponentially as the input voltage

exceeds the supply rails.

1) Select R3. Leakage current at IN is under 10nA, so

the current through R3 should be at least 1µA to

minimize errors caused by leakage current. The cur-

Output Stage Circuitry

These comparators contain a unique output stage

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. Another advantage realized in high-

speed, battery-powered applications is a substantial

increase in battery life.

rent through R3 at the trip point is (V

- V

) /

OUT

REF

R3. Considering the two possible output states in

solving for R3 yields two formulas: R3 = V / 1µA

REF

or R3 = (V

- V ) / 1µA. Use the smaller of the

REF

two resulting resistor values. For example, if V

REF

1.2V and V

= 5V, then the two R3 resistor values

are 1.2MΩ and 3.8MΩ. Choose a 1.2MΩ standard

value for R3.

2) Choose the hysteresis band required (V ). For this

example, choose 50mV.

3) Calculate R1 according to the following equation:

R1 = R3 x (V / V

)

For this example, insert the values R1 = 1.2MΩ x

(50mV / 5V) = 12kΩ.

4) Choose the trip point for V rising (V

; V

THF

THR

the trip point for V falling). This is the threshold

voltage at which the comparator switches its output

from low to high as V rises above the trip point. For

this example, choose 3V.

_______________________________________________________________________________________

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