AD8221

更新时间： 2024-11-20 21:58:07

品牌	Logo	应用领域
亚德诺 - ADI		仪表放大器
页数	文件大小	规格书
20页	1116K
描述
Precision Instrumentation Amplifier

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AD8221 数据手册

Precision Instrumentation Amplifier

AD8221

CONNECTION DIAGRAM

FEATURES

Available in space-saving MSOP package

Gain set with 1 external resistor (gain range 1 to 1000)

Wide power supply range: ±2.3 V to ±18 V

Temperature range for specified performance:

–40°C to +85°C

–IN

OUT

REF

–V

+IN

AD8221

TOP VIEW

Operational up to 125°C¹

EXCELLENT AC SPECIFICATONS

80 dB min CMRR to 10 kHz ( G = 1)

825 kHz –3 dB bandwidth (G = 1)

2 V/µs slew rate

Figure 1. SOIC and MSOP Connection Diagram

LOW NOISE

120

110

100

8 nV/√Hz, @ 1 kHz, max input voltage noise

0.25 µV p-p input noise (0.1 Hz to 10 Hz)

HIGH ACCURACY DC PERFORMANCE (AD8221BR)

90 dB min CMRR (G = 1)

25 µV max input offset voltage

0.3 µV/°C max input offset drift

0.4 nA max input bias current

AD8221

COMPETITOR 1

APPLICATIONS

Weigh scales

COMPETITOR 2

Industrial process controls

Bridge amplifiers

Precision data acquisition systems

Medical instrumentation

Strain gages

100

10k

100k

FREQUENCY (Hz)

Figure 2. Typical CMRR vs. Frequency for G = 1

Transducer interfaces

GENERAL DESCRIPTION

Programmable gain affords the user design flexibility. A single

resistor sets the gain from 1 to 1000. The AD8221 operates on

both single and dual supplies, and is well suited for applications

where 10 V input voltages are encountered.

The AD8221 is a gain programmable, high performance instru-

mentation amplifier that delivers the industry’s highest CMRR

over frequency. The CMRR of instrumentation amplifiers on

the market today falls off at 200 Hz. In contrast, the AD8221

maintains a minimum CMRR of 80 dB to 10 kHz for all grades

at G = 1. High CMRR over frequency allows the AD8221 to

reject wideband interference and line harmonics, greatly

simplifying filter requirements. Possible applications include

precision data acquisition, biomedical analysis, and aerospace

instrumentation.

The AD8221 is available in low cost 8-lead SOIC and MSOP

packages, both of which offer the industry’s best performance.

The MSOP requires half the board space of the SOIC, making it

ideal for multichannel or space-constrained applications.

Performance is specified over the entire industrial temperature

range of –40°C to +85°C for all grades. Furthermore, the

AD8221 is operational from –40°C to +125°C¹.

Low voltage offset, low offset drift, low gain drift, high gain

accuracy, and high CMRR make this part an excellent choice in

applications that demand the best dc performance possible,

such as bridge signal conditioning.

¹See Typical Performance Curves for expected operation from 85°C to 125°C.

Rev. A

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.

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

Tel: 781.329.4700

Fax: 781.326.8703

www.analog.com

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