AD8278

更新时间： 2024-11-07 06:36:11

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	601K
描述
Low Power, Wide Supply Range, Low Cost Difference Amplifier, G = ½, 2

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AD8278 数据手册

Low Power, Wide Supply Range,

Low Cost Difference Amplifier, G = ½, 2

AD8278

FUNCTIONAL BLOCK DIAGRAM

FEATURES

+VS

Wide input range beyond supplies

Rugged input overvoltage protection

Low supply current: 200 μA maximum

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)

Low offset voltage drift: 2 μV/°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

Figure 1.

8-lead SOIC and MSOP packages

Table 1. Difference Amplifiers by Category

Low

Distortion

High

Voltage

Current

APPLICATIONS

Sensing¹

Low Power

AD8276

AD8277

Voltage measurement and monitoring

Current measurement and monitoring

Instrumentation amplifier building block

Portable, battery-powered equipment

Test and measurement

AD8270

AD8271

AD8273

AD8274

AMP03

AD628

AD629

AD8202 (U)

AD8203 (U)

AD8205 (B)

AD8206 (B)

AD8216 (B)

¹U = unidirectional, B = bidirectional.

GENERAL DESCRIPTION

The AD8278 is a general-purpose difference amplifier intended

for precision signal conditioning in power critical applications

that require both high performance and low power. The AD8278

provides exceptional common-mode rejection ratio (80 dB) and

high bandwidth while amplifying signals 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.

The AD8278 can be used as a difference amplifier with G = ½

or G = 2. It 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 provides an

integrated precision solution that has a smaller size, lower cost,

and better performance than a discrete alternative.

The AD8278 operates 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 makes it ideal for battery-operated and portable

systems.

The common-mode range of the amplifier extends to almost

triple the supply voltage (for G = ½), making it 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 is available in the space-saving 8-lead MSOP

and SOIC packages. It is specified for performance over the

industrial temperature range of −40°C to +85°C and is fully

RoHS compliant.

Rev. 0

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

Fax: 781.461.3113

www.analog.com

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