Datasheet > AD8271

AD8271

更新时间： 2025-07-29 12:35:39

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
24页	513K
描述
Low Power, Wide Supply Range, Low Cost Difference Amplifiers,

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AD8271 数据手册

Low Power, Wide Supply Range,

Low Cost Difference Amplifiers, G = ½, 2

AD8278/AD8279

FEATURES

FUNCTIONAL BLOCK DIAGRAMS

+VS

Wide input range beyond supplies

Rugged input overvoltage protection

Low supply current: 200 μA maximum (per amplifier)

Low power dissipation: 0.5 mW at V_S= 2.5 V

Bandwidth: 1 MHz (G = ½)

CMRR: 80 dB minimum, dc to 20 kHz (G = ½, B Grade)

Low offset voltage drift: 1 ꢀV/°C maximum (B Grade)

Low gain drift: 1 ppm/°C maximum (B Grade)

Enhanced slew rate: 1.4 V/μs

AD8278

20kΩ

40kΩ

–IN

+IN

SENSE

OUT

20kΩ

REF

Wide power supply range

–VS

Single supply: 2 V to 36 V

Dual supplies: 2 V to 18 V

8-lead SOIC, 14-lead SOIC, and 8-lead MSOP packages

Figure 1. AD8278

+VS

AD8279

20kΩ

APPLICATIONS

40kΩ

–INA

SENSEA

OUTA

Voltage measurement and monitoring

Current measurement and monitoring

Instrumentation amplifier building block

Portable, battery-powered equipment

Test and measurement

+INA

–INB

REFA

40kΩ

20kΩ

SENSEB

OUTB

GENERAL DESCRIPTION

The AD8278 and AD8279 are general-purpose difference

amplifiers intended for precision signal conditioning in power

critical applications that require both high performance and low

power. The AD8278 and AD8279 provide exceptional common-

mode rejection ratio (80 dB) and high bandwidth while amplifying

input signals that are well beyond the supply rails. The on-chip

resistors are laser trimmed for excellent gain accuracy and high

CMRR. They also have extremely low gain drift vs. temperature.

+INB

REFB

40kΩ

20kΩ

–VS

Figure 2. AD8279

Table 1. Difference Amplifiers by Category

Low

Distortion

AD8270

AD8271

AD8273

AD8274

AMP03

High Voltage

AD628

AD629

Current Sensing¹

AD8202 (U)

AD8203 (U)

AD8205 (B)

AD8206 (B)

AD8216 (B)

Low Power

AD8276

AD8277

The common-mode range of the amplifier extends to almost

triple the supply voltage (for G = ½), making the amplifer ideal

for single-supply applications that require a high common-

mode voltage range. The internal resistors and ESD circuitry at

the inputs also provide overvoltage protection to the op amp.

The AD8278 and AD8279 can be used as difference amplifiers with

G = ½ or G = 2. They can also be connected in a high precision,

single-ended configuration for non inverting and inverting gains of

−½, −2, +3, +2, +1½, +1, or +½. The AD8278 and AD8279

provide an integrated precision solution that has a smaller size,

lower cost, and better performance than a discrete alternative.

¹U = unidirectional, B = bidirectional.

The AD8278 is available in the space-saving 8-lead MSOP and

SOIC packages, and the AD8279 is offered in a 14-lead SOIC

package. Both are specified for performance over the industrial

temperature range of −40°C to +85°C and are fully RoHS

compliant.

The AD8278 and AD8279 operate on single supplies (2.0 V to 36 V)

or dual supplies ( 2 V to 18 V). The maximum quiescent supply

current is 200 μA, which is ideal for battery-operated and portable

systems. For unity-gain difference amplifiers with similar

performance, refer to the AD8276 and AD8277 data sheets.

Rev. C

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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