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www.fairchildsemi.com

KM4111/KM4121

0.2mA, Low Cost, +2.7V & +5V, 35MHz Rail-to-Rail Amplifiers

Features

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General Description

The KM4111 (single) and KM4121 (single with disable)

are ultra-low power, low cost, voltage feedback

amplifiers. These amplifiers use only 208碌A(chǔ) of supply

current and are designed to operate on +2.7V, +5V,

or 鹵2.5V supplies. The input voltage range extends

300mV below the negative rail and 1.2V below the

positive rail.

The KM4111 offers high bipolar performance at a

low CMOS price. The KM4111 offers superior dynamic

performance with a 35MHz small signal bandwidth

and 27V/碌s slew rate. The combination of lowpower,

high bandwidth, and rail-to-rail performance make

the KM4111 well suited for battery-powered commu-

nication/computing systems.

208碌A(chǔ) supply current

35MHz bandwidth

Power down to I

s

= 35碌A(chǔ) (KM4121)

Fully specified at +2.7V and +5V supplies

Output voltage range: 0.08V to 4.88V; V

s

= +5

Input voltage range: -0.3V to +3.8V; V

s

= +5

27V/碌s slew rate

鹵8.5mA linear output current

鹵13mA short circuit output current

21nV/鈭欻z input voltage noise

Directly replaces MAX4281

Small package options (SOT23-5 and SOT23-6)

Applications

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Normalized Magnitude (2dB/div)

0.1

Portable/battery-powered applications

A/D buffer

Active filters

Signal conditioning

Portable test instruments

Non-Inverting Freq. Response V

s

= +5V

G=

2

KM4111/KM4121 Packages

SOT23-5 (KM4111)

Out

-V

s

+In

1

2

+

5

+V

s

-

1

10

100

Frequency (MHz)

3

4

-In

SOT23-6 (KM4121)

Out

-V

s

+In

1

2

+

6

5

4

+V

s

DIS

-In

-

3

REV. 1B June 2001

next

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