Datasheet > MAX987

MAX987

更新时间： 2023-12-20 18:44:29

品牌	Logo	应用领域
亚德诺 - ADI		比较器
页数	文件大小	规格书
13页	1699K
描述
高速、微功耗、低电压、SOT23封装、满摆幅输入/输出比较器

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MAX987 数据手册

MAX987/MAX988/MAX991/

MAX992/MAX995/MAX996

High-Speed, Micropower, Low-Voltage,

Rail-to-Rail I/O Comparators

5) Calculate R2 as shown. For this example, choose an

Use the following procedure to calculate resistor

values:

8.2kΩ standard value:

1) Select R3 according to the formulas R3 = V

/ 1µA

REF

R2 =

or R3 = (V

- V ) / 1µA - R4. Use the smaller of

REF











THR

the two resulting resistor values.

−

x R1 R1 R3

REF



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

example, choose 50mV.

R2 =

= 8.03kΩ

3.0V







3) Calculate R1 according to the following equation:

−





1.2 x 12kΩ 12kΩ 2.2MΩ



R1 = (R3 + R4) x (V

/ V

)

4) Choose the trip point for V rising (V

; V

is the

6) Verify trip voltages and hysteresis as follows:

THR THF

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





at which the comparator switches its output from low

rising: V

= V x R1 x

REF

THR







R1 R2 R3



to high as V rises above the trip point.

R1 x V





5) Calculate R2 as follows:

falling: V

= V

−

THR

THF









R2 =

Hysteresis = V

− V

THF

THR











THR

−

x R1 R1 R3 + R4

REF



MAX988/MAX992/MAX996

The MAX988/MAX992/MAX996 have ±2.5mV internal

hysteresis. They have open-drain outputs and require an

external pullup resistor (Figure 2). Additional hysteresis

can be generated using positive feedback, but the formulas

differ slightly from those of the MAX987/MAX991/MAX995.

6) Verify trip voltages and hysteresis as follows:

rising: V

= V x R1 x

REF

THR













R1 R2 R3 + R4

R1 x V





falling: V

= V

−

THR

THF









R3 + R4

Hysteresis = V

− V

THF

THR

0.1µF

Circuit Layout and Bypassing

These comparators’ high-gain bandwidth requires design

precautions to maximize their high-speed capability. The

recommended precautions are:

OUT

1) Use a PCB with an unbroken, low-inductance ground

plane.

MAX988

MAX992

MAX996

REF

2) Place a decoupling capacitor (a 0.1µF ceramic

capacitor is a good choice) as close to V

possible.

3) On the inputs and outputs, keep lead lengths short

to avoid unwanted parasitic feedback around the

comparators.

Figure 2. Additional Hysteresis (MAX988/MAX992/MAX996)

4) Solder the devices directly to the PCB instead of

using a socket.

Maxim Integrated

│ 9

www.maximintegrated.com

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