MAX4490AUK-T 查看數據表（PDF） - Maxim Integrated

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MAX4490AUK-T

Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70

Maxim Integrated 

Low-Cost, High-Slew-Rate,

Rail-to-Rail I/O Op Amps in SC70

Pin Description

MAX4490

1

2

3

4

5

–

–

–

–

–

–

–

–

–

PIN

MAX4491

–

4

–

–

8

3

2

1

5

6

7

–

–

–

MAX4492

–

11

–

–

4

3

2

1

5

6

7

10, 12

9, 13

8, 14

NAME

IN+

VSS

IN-

OUT

VDD

INA+

INA-

OUTA

INB+

INB-

OUTB

INC+, IND+

INC-, IND-

OUTC, OUTD

FUNCTION

Noninverting Input

Negative Supply Input. Connect to ground for single-supply operation.

Inverting Input

Amplifier Output

Positive Supply Input

Noninverting Input to Amplifier A

Inverting Input to Amplifier A

Amplifier A Output

Noninverting Input to Amplifier B

Inverting Input to Amplifier B

Amplifier B Output

Noninverting Inputs to Amplifiers C and D

Inverting Inputs to Amplifiers C and D

Amplifiers C and D Outputs

Detailed Description

Rail-to-Rail Input Stage

The MAX4490/MAX4491/MAX4492 CMOS operational

amplifiers have parallel-connected N- and P-channel

differential input stages that combine to accept a com-

mon-mode range extending to both supply rails. The N-

channel stage is active for common-mode input

voltages typically greater than (VSS + 1.2V), and the P-

channel stage is active for common-mode input volt-

ages typically less than (VDD - 1.2V).

Rail-to-Rail Output Stage

The MAX4490/MAX4491/MAX4492 CMOS operational

amplifiers feature class-AB push-pull output stages that

can drive a 100kΩ load to within 1.5mV of either supply

rail. Short-circuit output current is typically ±50mA.

Figures 1a and 1b show the typical temperature depen-

dence of output source and sink currents, respectively,

for three fixed values of (VDD - VOH) and (VOL - VSS).

For example, at VDD = +5.0V, the load currents that

maintain (VDD - VOH) = 100mV and (VOL - VSS) = 100mV

at TA = +25°C are 2.2mA and 3.3mA, respectively,

when the load is connected to VDD/2. Consistent resis-

tive drive capability is (2.5 - 0.1) / 2.2 = 1.1kΩ. For the

same application, resistive drive capability is 2.2kΩ

when the load is connected to VDD or VSS.

Applications Information

Power-Supply Considerations

The MAX4490/MAX4491/MAX4492 operate from a sin-

gle +2.7V to +5.5V supply or from dual ±1.35V to

±2.75V supplies with typically 800µA supply current

per amplifier. A high power-supply rejection ratio of

100dB allows for extended operation from a decaying

battery voltage, thereby simplifying designs for

portable applications. For single-supply operation,

bypass the power supply with a 0.1µF ceramic capaci-

tor placed close to the VDD pin. For dual-supply opera-

tion, bypass each supply to ground.

Input Capacitance

One consequence of the parallel-connected differential

input stages for rail-to-rail operation is a relatively large

input capacitance CIN (typically 5pF). This introduces a

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