MAX999EUK+

更新时间： 2024-02-13 00:14:39

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美信 - MAXIM		/
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MAX999EUK+ 数据手册

Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,

Beyond-the-Rails Comparators

voltage to move quickly past the other, thus taking the

_______________Detailed Description

input out of the region where oscillation occurs. Standard

The MAX961–MAX964/MAX997/MAX999 single-supply

comparators require hysteresis to be added with external

comparators feature internal hysteresis, ultra-high-

resistors. The fixed internal hysteresis eliminates these

speed operation, and low power consumption. Their

resistors.

outputs are guaranteed to pull within 0.52V of either rail

The MAX961/MAX963 include internal latches that allow

storage of comparison results. LE has a high input

impedance. If LE is low, the latch is transparent (i.e.,

the comparator operates as though the latch is not pre-

sent). The comparator’s output state is stored when LE

is pulled high. All timing constraints must be met when

using the latch function (Figure 2).

without external pullup or pulldown circuitry. Beyond-

the-Rails input voltage range and low-voltage, single-

supply operation make these devices ideal for portable

equipment. These comparators all interface directly to

CMOS logic.

Timing

Most high-speed comparators oscillate in the linear

region because of noise or undesirable parasitic feed-

back. This can occur when the voltage on one input is

close to or equal to the voltage on the other input.

These devices have a small amount of internal hystere-

sis to counter parasitic effects and noise.

Input Stage Circuitry

The MAX961–MAX964/MAX997/MAX999 include inter-

nal protection circuitry that prevents damage to the pre-

cision input stage from large differential input voltages.

This protection circuitry consists of two groups of three

front-to-back diodes between IN+ and IN-, as well as

two 200Ω resistors (Figure 3). The diodes limit the dif-

ferential voltage applied to the comparator’s internal

The added hysteresis of the MAX961–MAX964/MAX997/

MAX999 creates two trip points: one for the rising input

voltage and one for the falling input voltage (Figure 1).

The difference between the trip points is the hysteresis.

When the comparator’s input voltages are equal, the

hysteresis effectively causes one comparator input

circuitry to no more than 3V , where V is the diode’s

forward-voltage drop (about 0.7V at +25°C).

TRIP+

IN+

+ V

HYST

TRIP-

TRIP+

TRIP-

= 0V

IN-

Figure 1. Input and Output Waveforms, Noninverting Input Varied

_______________________________________________________________________________________

1...4 5 678 9 10...14

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