AD8420

更新时间： 2024-11-21 07:18:51

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	348K
描述
Low Noise, Low Gain Drift, G = 2000

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AD8420 数据手册

Low Noise, Low Gain Drift, G = 2000

Instrumentation Amplifier

Data Sheet

AD8428

FEATURES

FUNCTIONAL BLOCK DIAGRAM

–FIL

Fixed gain of 2000

Access to internal nodes provides flexibility

Low noise: 1.5 nV/√Hz input voltage noise

High accuracy dc performance

Gain drift: 5 ppm/°C

Offset drift: 0.3 μV/°C

Gain accuracy: 0.05%

–IN

6kΩ

120kΩ

3kΩ

30.15Ω

3kΩ

OUT

REF

6kΩ

120kΩ

CMRR: 140 dB min

+IN

Excellent ac specifications

Bandwidth: 3.5 MHz

AD8428

–V

Slew rate: 40 V/μs

+FIL

Power supply range: 4 V to 18 V

8-lead SOIC package

ESD protection: 5000 V (HBM)

Temperature range for specified performance:

−40°C to +85°C

Figure 1.

Table 1. Instrumentation Amplifiers by Category¹

General-

Purpose

Zero

Drift

Military

Grade

Low

Power

Low

Noise

AD8220

AD8221

AD8222

AD8224

AD8228

AD8295

AD8231

AD8290

AD8293

AD8553

AD8556

AD8557

AD620

AD621

AD524

AD526

AD624

AD627

AD623

AD8428

AD8429

Operational up to 125°C

APPLICATIONS

AD8235

AD8236

AD8426

AD8226

AD8227

AD8420

Sensor interface

Medical instrumentation

Patient monitoring

¹See www.analog.com for the latest instrumentation amplifiers.

The AD8428 is one of the fastest instrumentation amplifiers

available. The circuit architecture is designed for high bandwidth

at high gain. The AD8428 uses a current feedback topology for

the initial preamplifier gain stage of 200, followed by a difference

amplifier stage of 10. This architecture results in a 3.5 MHz

bandwidth at a gain of 2000 for an equivalent gain bandwidth

product of 7 GHz.

GENERAL DESCRIPTION

The AD8428 is an ultralow noise instrumentation amplifier

designed to accurately measure tiny, high speed signals. It

delivers industry-leading gain accuracy, noise, and bandwidth.

All gain setting resistors for the AD8428 are internal to the part

and are precisely matched. Care is taken in both the chip pinout

and layout. This results in excellent gain drift and quick settling

to the final gain value after the part is powered on.

The AD8428 pinout allows access to internal nodes between the

first and second stages. This feature can be useful for modifying

the frequency response between the two amplification stages,

thereby preventing unwanted signals from contaminating the

output results.

The high CMRR of the AD8428 prevents unwanted signals

from corrupting the signal of interest. The pinout of the AD8428

is designed to avoid parasitic capacitance mismatches that can

degrade CMRR at high frequencies.

The performance of the AD8428 is specified over the industrial

temperature range of −40°C to +85°C. It is available in an 8-lead

plastic SOIC package.

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 registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

www.analog.com

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与AD8420相关器件

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AD8420_12	ADI	获取价格	Wide Supply Range, Micropower,
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AD8420ARMZ-R7	ADI	获取价格	Wide Supply Range, Micropower,
AD8420ARMZ-RL	ADI	获取价格	Wide Supply Range, Micropower,
AD8420BRMZ	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8420BRMZ-R7	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8420BRMZ-RL	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8421	ADI	获取价格	3 nV/√Hz, Low Power
AD8421ARMZ	ADI	获取价格	3 nV/√Hz, Low Power
AD8421ARMZ-R7	ADI	获取价格	3 nV/√Hz, Low Power

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