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AD8276BRMZ 데이터시트(PDF) 1 Page - Analog Devices

부품명 AD8276BRMZ
상세설명  Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifiers
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Low Power, Wide Supply Range, Low Cost
Unity-Gain Difference Amplifiers
AD8276/AD8277
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.
FEATURES
Wide input range beyond supplies
Rugged input overvoltage protection
Low supply current: 200 μA maximum per channel
Low power dissipation: 0.5 mW at VS = 2.5 V
Bandwidth: 550 kHz
CMRR: 86 dB minimum, dc to 10 kHz
Low offset voltage drift: ±2 μV/°C maximum (B Grade)
Low gain drift: 1 ppm/°C maximum (B Grade)
Enhanced slew rate: 1.1 V/μs
Wide power supply range:
Single supply: 2 V to 36 V
Dual supplies: ±2 V to ±18 V
APPLICATIONS
Voltage measurement and monitoring
Current measurement and monitoring
Differential output instrumentation amplifier
Portable, battery-powered equipment
Test and measurement
GENERAL DESCRIPTION
The AD8276/AD8277 are general-purpose, unity-gain difference
amplifiers intended for precision signal conditioning in power
critical applications that require both high performance and low
power. They provide exceptional common-mode rejection ratio
(86 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 common-mode range of the amplifiers extends to almost
double the supply voltage, making these amplifiers 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 amps.
The AD8276/AD8277 are unity-gain stable. While they are
optimized for use as difference amplifiers, they can also be
connected in high precision, single-ended configurations with
G = −1, +1, +2. The AD8276/AD8277 provide an integrated
precision solution that has smaller size, lower cost, and better
performance than a discrete alternative.
The AD8276/AD8277 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 per channel, which is ideal for battery-
operated and portable systems.
FUNCTIONAL BLOCK DIAGRAM
2
5
3
1
6
7
4
40kΩ
40kΩ
40kΩ
–VS
+VS
–IN
+IN
SENSE
OUT
REF
40kΩ
AD8276
Figure 1. AD8276
2
12
3
14
13
11
40kΩ
40kΩ
40kΩ
+VS
–INA
+INA
SENSEA
OUTA
REFA
40kΩ
AD8277
6
10
5
8
9
4
40kΩ
40kΩ
40kΩ
–VS
–INB
+INB
SENSEB
OUTB
REFB
40kΩ
Figure 2. AD8277
Table 1. Difference Amplifiers by Category
Low
Distortion
High
Voltage
Current
Sensing1
Low Power
AD8270
AD628
AD8202 (U)
AD8276
AD8271
AD629
AD8203 (U)
AD8277
AD8273
AD8205 (B)
AD8278
AD8274
AD8206 (B)
AMP03
AD8216 (B)
1 U = unidirectional, B = bidirectional.
The AD8276 is available in the space-saving 8-lead MSOP and
SOIC packages, and the AD8277 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.


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