December 1998

1

MIC7201

MIC7201

Micrel

MIC7201

GainBlock™ Difference Amplifier

Preliminary Information

General Description

The MIC7201 difference amplifier is an analog gain block

designed to convert a differential signal to a signal-ended

signal. It features an extended common-mode range that

includes rail-to-rail input/output capabilities. The part is pack-

aged in the SOT-23-5 IttyBitty™ package.

The MIC7201 is designed using the MIC7101 operational

amplifier plus well-matched monolithic resistors to provide a

unity-gain stable differential input to signal-ended output

amplifier that requires a minimum of external components.

Performance is guaranteed from 2.2V through 10V.

Features

• Operates from 2.2V to 10V

•

±1% typical gain error

• 0.6mA typical supply current at 2.2V

• 400kHz bandwidth

• Small SOT-23-5 package

• Suitable for driving capacitive loads

Applications

• Cellular telephones

• Digital audio systems

• Mobile communications

• Portable computers and PDAs

Ordering Information

Part Number

Temperature Range

Package

MIC7201BM5

–40

°C to +85°C

SOT-23-5

Other voltages available. Contact Micrel for details.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

GainBlock is a trademark of Micrel, Inc.

Block Diagram

IN+

OUT

50k

100k

V+

50k

50k

100k

IN–

V–

MIC7201

1

2

3

4

5

Difference Amplifier Behavior

The desired 100mV, 400Hz differential sinusoidal signal is shown applied to

inputs V

imposed on both V

These signals demonstrate the noise cancellation ability of the MIC7201.

The output (V

400Hz sine wave.

V

IN–

V

IN+

V

OUT