MAX4022EEE

更新时间： 2024-01-05 03:44:53

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
12页	121K
描述
Low-Cost, High-Speed, Single-Supply, Gain of +2 Buffers with Rail-to-Rail Outputs in SOT23

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MAX4022EEE 数据手册

Lo w -Co s t , Hig h -S p e e d , S in g le -S u p p ly, Ga in o f +2

Bu ffe rs w it h Ra il-t o -Ra il Ou t p u t s in S OT2 3

719/MAX402

-1

-2

-20

-3

-40

-4

-5

-6

-60

-80

-100

-120

-140

-160

-7

-8

-9

-10

100

200

300

400

500

100

200

300

400

500

V (mV ABOVE V )

Figure 2. Enable Logic-Low Input Current vs. Enable Logic-

Low Threshold

Figure 4. Enable Logic-Low Input Current vs. Enable Logic-

Low Threshold with 10kΩ Series Resistor

the output-drive capability, since the buffers have a

fixed voltage gain of +2 or -1.

ENABLE

10k

For example, a 50Ω load can typically be driven from

40mV above V to 1.6V below V , or 40mV to 3.4V

when operating from a single +5V supply. If the buffer is

operated in the noninverting, gain of +2 configuration

with the inverting input grounded, the effective input

voltage range becomes 20mV to 1.7V, instead of the

-100mV to 2.75V indicated by the Electrical Character-

istics. Beyond the effective input range, the buffer out-

put is a nonlinear function of the input, but it will not

undergo phase reversal or latchup.

IN+

IN-

EN_

MAX40_ _

OUT

500Ω

En a b le

The MAX4019 has an enable feature (EN_) that allows

the buffer to be placed in a low-power state. When the

buffers are disabled, the supply current will not exceed

550µA per buffer.

Figure 3. Circuit to Reduce Enable Logic-Low Input Current

In p u t Vo lt a g e Ra n g e a n d Ou t p u t S w in g

The input range for the MAX4014 family extends from

(V - 100mV) to (V

- 2.25V). Input ground sensing

As the voltage at the EN_ pin approaches the negative

supply rail, the EN_ input current rises. Figure 2 shows

a graph of EN_ input current versus EN_ pin voltage.

Figure 3 shows the addition of an optional resistor in

series with the EN pin, to limit the magnitude of the cur-

rent increase. Figure 4 displays the resulting EN pin

input current to voltage relationship.

increases the dynamic range for single-supply applica-

tions. The outputs drive a 2kΩ load to within 60mV of

the power-suply rails. With heavier loads, the output

swing is reduced as shown in the Electrical Character-

istics and the Typical Operating Characteristics. As the

load increases, the input range is effectively limited by

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