MAX9914 데이터 시트보기 (PDF) - Maxim Integrated

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MAX9914

1MHz, 20µA, Rail-to-Rail I/O Op Amps with Shutdown

Maxim Integrated 

1MHz, 20µA, Rail-to-Rail I/O Op Amps

with Shutdown

MAX9914

1

2

3

4

5

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—

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—

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PIN

MAX9915

MAX9916

1

—

2

4

3

—

4

—

6

8

5

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1

—

2

—

3

—

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5

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6

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7

MAX9917

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4

—

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10

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1

2

3

5

6

7

8

9

NAME

IN+

VSS

IN-

OUT

VDD

SHDN

OUTA

INA-

INA+

SHDNA

SHDNB

INB+

INB-

OUTB

Pin Description

FUNCTION

Noninverting Amplifier Input

Negative Supply Voltage

Inverting Amplifier Input

Amplifier Output

Positive Supply Voltage

Shutdown

Amplifier Output Channel A

Inverting Amplifier Input Channel A

Noninverting Amplifier Input Channel A

Shutdown Channel A

Shutdown Channel B

Noninverting Amplifier Input Channel B

Inverting Amplifier Input Channel B

Amplifier Output Channel B

Detailed Description

Featuring a maximized ratio of gain bandwidth to

supply current, low operating supply voltage, low input

bias current, and rail-to-rail inputs and outputs, the

MAX9914–MAX9917 are an excellent choice for preci-

sion or general-purpose low-current, low-voltage, bat-

tery-powered applications. These CMOS devices

consume an ultra-low 20µA (typ) supply current and a

200µV (typ) offset voltage. For additional power

conservation, the MAX9914/MAX9917 feature a low-

power shutdown mode that reduces supply current to

1nA (typ), and puts the amplifiers’ output in a high-

impedance state. These devices are unity-gain stable

with a 1MHz gain-bandwidth product driving capacitive

loads up to 30pF. The capacitive load can be

increased to 100pF when the amplifier is configured for

a 10V/V gain.

Rail-to-Rail Inputs and Outputs

The MAX9914–MAX9917 amplifiers all have a parallel-

connected n- and p-channel differential input stage that

allows an input common-mode voltage range that

extends 100mV beyond the positive and negative sup-

ply rails, with excellent common-mode rejection.

The MAX9914–MAX9917 are capable of driving the out-

put to within 5mV of both supply rails with a 100kΩ load.

These devices can drive a 5kΩ load with swings to within

60mV of the rails. Figure 1 shows no clipping at the out-

put voltage swing of the MAX9914–MAX9917 configured

as a unity-gain buffer powered from a single 3V supply.

Low Input Bias Current

The MAX9914–MAX9917 feature ultra-low 1pA (typ)

input bias current. The variation in the input bias

current is minimal with changes in the input voltage due

to very high input impedance (in the order of 1GΩ).

Applications Information

Driving Capacitive Loads

The MAX9914–MAX9917 amplifiers are unity-gain

stable for loads up to 30pF. However, the capacitive

load can be increased to 100pF when the amplifier is

configured for a minimum gain of 10V/V.

Applications that require greater capacitive drive

capability should use an isolation resistor between the

output and the capacitive load (Figure 2). Also, in

unity-gain applications with relatively small RL (about

5kΩ), the capacitive load can be increased up to 100pF.

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