Datasheet > MAX987_07

MAX987_07

更新时间： 2022-11-18 00:21:06

品牌	Logo	应用领域
美信 - MAXIM		比较器
页数	文件大小	规格书
13页	321K
描述
High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators

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MAX987_07 数据手册

High-Speed, Micropower, Low-Voltage,

SOT23, Rail-to-Rail I/O Comparators

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

8.2kΩ standard value:

Use the following procedure to calculate resistor

values:

R2 =

⎛

⎞

⎟

1) Select R3 according to the formulas R3 = V

/ 1µA

THR

REF

−

⎜

or R3 = (V

- V ) / 1µA - R4. Use the smaller of

REF

x R1

⎝

⎠

REF

the two resulting resistor values.

R2 =

= 8.03kΩ

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

⎛

⎜

⎞

3.0V

example, choose 50mV.

−

⎟

⎝1.2 x 12kΩ⎠

12kΩ

2.2MΩ

3) Calculate R1 according to the following equation:

6) Verify trip voltages and hysteresis as follows:

R1 = (R3 + R4) x (V / V

)

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.

rising: V

= V

x R1 x

THR

REF

⎜

⎟

⎝

⎠

5) Calculate R2 as follows:

⎛

⎞

R1 x V

falling: V

= V

−

THF

THR

⎜

⎟

⎝

⎠

R2 =

Hysteresis = V

− V

THF

⎛

⎜

⎞

⎟

THR

−

x 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 hys-

teresis 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

⎛

⎞

⎜

⎟

R3 + R4

⎝

⎠

⎛

⎞

R1 x V

R3 + R4

falling: V

= V

−

THF

THR

⎜

⎟

⎝

⎠

Hysteresis = V

− V

THF

THR

0.1µF

Circuit Layout and Bypassing

These comparators’ high-gain bandwidth requires

design precautions to maximize their high-speed capa-

bility. The recommended precautions are:

OUT

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

ground plane.

MAX988

MAX992

MAX996

2) Place a decoupling capacitor (a 0.1µF ceramic

REF

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.

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