MAX4040ESA 查看數據表（PDF） - Maxim Integrated

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MAX4040ESA

Single/Dual/Quad, Low-Cost, SOT23, Micropower Rail-to-Rail I/O Op Amps

Maxim Integrated 

Single/Dual/Quad, Low-Cost, SOT23,

Micropower, Rail-to-Rail I/O Op Amps

______________________________________________________________Pin Description

MAX4040

SOT23-5 SO/µMAX

PIN

MAX4041 MAX4042

MAX4043

µMAX SO

1

6

6

—

—

—

NAME

MAX4044

—

OUT

2

4

4

3

3

3

4

2

2

5

7

7

—

1, 5, 8

1, 5

4

4

4

11

VEE

—

—

—

—

IN+

—

—

—

—

IN-

8

10

14

4

VCC

—

—

5, 7,

8, 10

—

N.C.

—

—

8

—

—

—

—

SHDN

FUNCTION

Amplifier Output. High impedance

when in shutdown mode.

Negative Supply. Tie to ground for

single-supply operation.

Noninverting Input

Inverting Input

Positive Supply

No Connection. Not internally con-

nected.

Shutdown Input. Drive high, or tie to

VCC for normal operation. Drive to VEE

to place device in shutdown mode.

—

—

—

1, 7

1, 9 1, 13

1, 7

OUTA, Outputs for Amplifiers A and B. High

OUTB impedance when in shutdown mode.

—

—

—

2, 6

2, 8 2, 12

2, 6

INA-,

INB-

Inverting Inputs to Amplifiers A and B

—

—

—

3, 5

3, 7 3, 11

3, 5

INA+,

INB+

Noninverting Inputs to Amplifiers A

and B

Shutdown Inputs for Amplifiers A

—

—

—

—

5, 6 6, 9

—

SHDNA, and B. Drive high, or tie to VCC for

SHDNB normal operation. Drive to VEE to

place device in shutdown mode.

—

—

—

—

—

—

8, 14

OUTC,

OUTD

Outputs for Amplifiers C and D

—

—

—

—

—

—

9, 13

INC-,

IND-

Inverting Inputs to Amplifiers C and D

—

—

—

—

—

—

10, 12

INC+,

IND+

Noninverting Inputs to Amplifiers C

and D

_______________Detailed Description

Rail-to-Rail Input Stage

The MAX4040–MAX4044 have rail-to-rail inputs and

rail-to-rail output stages that are specifically designed

for low-voltage, single-supply operation. The input

stage consists of separate NPN and PNP differential

stages, which operate together to provide a common-

mode range extending to both supply rails. The

crossover region of these two pairs occurs halfway

between VCC and VEE. The input offset voltage is typi-

cally 200µV. Low operating supply voltage, low supply

current, rail-to-rail common-mode input range, and rail-

to-rail outputs make this family of operational amplifiers

an excellent choice for precision or general-purpose,

low-voltage battery-powered systems.

Since the input stage consists of NPN and PNP pairs,

the input bias current changes polarity as the common-

mode voltage passes through the crossover region.

Match the effective impedance seen by each input to

reduce the offset error caused by input bias currents

flowing through external source impedances (Figures

1a and 1b). The combination of high source impedance

plus input capacitance (amplifier input capacitance

plus stray capacitance) creates a parasitic pole that

produces an underdamped signal response. Reducing

input capacitance or placing a small capacitor across

the feedback resistor improves response in this case.

8 _______________________________________________________________________________________

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