ad8420armz-rl Analog Devices, Inc., ad8420armz-rl Datasheet

ad8420armz-rl

Manufacturer Part Number

ad8420armz-rl

Description

Wide Supply Range, Rail-to-rail Output Instrumentation Amplifier

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD8420ARMZ-RL.pdf (10 pages)

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Preliminary Technical Data

FEATURES

Gain set with 2 external resistors

Input voltage goes below ground

Very wide power supply range

Bandwidth (G=100): 2.5 kHz

Input noise: 50 nV/√Hz

Max supply current: 90 µA

Max offset voltage: 200 uV

Max differential input voltage: 1V

Min CMRR: 100 dB

MSOP-8 package

APPLICATIONS

Bridge amplifiers

Pressure Measurement

Medical instrumentation

Portable data acquisition

Multichannel systems

GENERAL DESCRIPTION

The AD8420 is a low cost, wide supply range amplifier that uses

two resistors to set any gain between 1 and 1000. It is optimized

to amplify small differential voltages in the presence of large

common mode signals.

The AD8420 is based on a current mode architecture that gives

it excellent input common mode range. Unlike conventional

instrumentation amplifiers, the AD8420 can easily amplify

signals at or even slightly below ground without requiring dual

supplies. The AD8420 has a full rail to rail output, and the

output voltage is completely independent of the input common

mode voltage.

Rev. PrD

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Gain range: 1 to 1000

Single supply: 2.7V to 36V

Dual supply: +/-2.7V to+/-18V

Wide Supply Range, Rail-to-Rail Output

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

Table 1. Instrumentation Amplifiers by Category

General

Purpose

AD8221/2

AD8220/4

AD8228

AD8295

The AD8420 can operate off both single or dual supplies. It

works well for a portable system with a limited single supply

voltage and equally well for a system using large dual supplies.

Gain is set using the ratio of two resistors. A reference pin

allows the user to offset the output voltage. This feature is useful

when the output signal needs to be centered around a specific

voltage, such as mid-supply.

The AD8420 is available in an 8 pin MSOP package.

Performance is specified over the full temperature range of

−40°C to +85°C. Part is operational from −40°C to +125°C

See

www.analog.com

Instrumentation Amplifier

–V

Zero

Drift

AD8231

AD8290

AD8293

AD8553

AD8556

AD8557

+IN

–IN

PIN CONFIGURATION

for the latest instrumentation amplifiers.

Military

Grade

AD620

AD621

AD524

AD526

AD624

(Not to Scale)

AD8420

TOP VIEW

Figure 1.

Low

Power

AD8420

AD8235/6

AD627

AD8226/7

AD623

AD8223

REF

OUT

AD8420

www.analog.com

Digital

Gain

AD8250

AD8251

AD8253

AD8231

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ad8420armz-rl Summary of contents

Page 1

... OUT 7 FB REF AD8420 TOP VIEW (Not to Scale) Figure 1. 1 Military Low Digital Grade Power Gain AD620 AD8420 AD8250 AD621 AD8235/6 AD8251 AD524 AD627 AD8253 AD526 AD8226/7 AD8231 AD624 AD623 AD8223 www.analog.com ©2011 Analog Devices, Inc. All rights reserved. ...

Page 2

AD8420 SPECIFICATIONS +V = 5V, − =0V REF IN+ otherwise noted Table 2. Parameter COMMON-MODE REJECTION RATIO (CMRR) CMRR CMRR at 1 kHz NOISE Voltage ...

Page 3

Preliminary Technical Data GAIN 2 Gain Range Gain Error Gain vs. Temperature OUTPUT Output Swing kΩ to mid supply 100 kΩ to mid supply L Short-Circuit Current POWER SUPPLY Operating Range Quiescent Current TEMPERATURE ...

Page 4

AD8420 + −V = − REF Table 3. Parameter COMMON-MODE REJECTION RATIO (CMRR) CMRR CMRR at 1 kHz NOISE Voltage Noise Spectral Density Peak ...

Page 5

Preliminary Technical Data GAIN 2 Gain Range Gain Error Gain Nonlinearity 100 G = 1000 Gain vs. Temperature OUTPUT Output Swing kΩ to ground 100 kΩ to ...

Page 6

AD8420 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage Output Short-Circuit Current Maximum Voltage at −IN or +IN Minimum Voltage at −IN or +IN Maximum Voltage at REF Minimum Voltage at REF Storage Temperature Range ESD Human Body Model Charge ...

Page 7

Preliminary Technical Data PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 6. Pin Function Descriptions Pin No. Mnemonic Description 1 NC This pin not connected internally. For best CMRR vs. frequency and leakage performance, connect this pin to negative supply. 2 +IN ...

Page 8

AD8420 THEORY OF OPERATION ESD AND +IN OVERVOLTAGE PROTECTION ESD AND –IN OVERVOLTAGE PROTECTION ARCHITECTURE The AD8420 consists of three amplifiers: two matched transconductance amplifiers that convert voltage to current and one integrator amplifier that converts current to voltage. The ...

Page 9

Preliminary Technical Data INPUT VOLTAGE RANGE Unlike traditional instrumentation amplifier architectures, the allowed input range of the AD8420 is simplicity itself. For the AD8420’s transfer function to be valid, the input voltage should follow two rules: 1) Keep differential input ...

Page 10

... OUTLINE DIMENSIONS ORDERING GUIDE Model 1 Temperature Range AD8420ARMZ −40°C to +125°C AD8420ARMZ-R7 −40°C to +125°C AD8420ARMZ-RL −40°C to +125°C AD8420BRMZ −40°C to +125°C AD8420BRMZ-R7 −40°C to +125°C AD8420BRMZ-RL −40°C to +125° RoHS Compliant Part. ...

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