MAX9912 데이터 시트보기 (PDF) - Maxim Integrated

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MAX9912

200kHz, 4µA, Rail-to-Rail I/O Op Amps with Shutdown

Maxim Integrated 

MAX9910

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200kHz, 4µA, Rail-to-Rail

I/O Op Amps with Shutdown

PIN

MAX9911

MAX9912

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MAX9913

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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 GBW to supply current,

low operating supply voltage, low input bias current,

and rail-to-rail inputs and outputs, the MAX9910–

MAX9913 are an excellent choice for precision or gen-

eral-purpose, low-current, low-voltage, battery-powered

applications. These CMOS devices consume an ultra-

low 4µA (typ) supply current and a 200µV (typ) offset

voltage. For additional power conservation, the

MAX9911/MAX9913 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 200kHz

GBW product, driving capacitive loads up to 30pF. The

capacitive load can be increased to 250pF when the

amplifier is configured for a 10V/V gain.

Rail-to-Rail Inputs and Outputs

All of the MAX9910–MAX9913 amplifiers 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 MAX9910–MAX9913 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 the output

voltage swing of the MAX9910–MAX9913 configured as

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

Low Input Bias Current

The MAX9910–MAX9913 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 MAX9910–MAX9913 amplifiers are unity-gain sta-

ble for loads up to 30pF. However, the capacitive load

can be increased to 250pF when the amplifier is config-

ured for a minimum gain of 10V/V. Applications that

require greater capacitive-drive capability should use

an isolation resistor between the output and the capaci-

tive load (Figure 2). Also, in unity-gain applications with

relatively small RL (approximately 5kΩ), the capacitive

load can be increased up to 200pF.

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