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AD8278BRZ-RL Fiches technique(PDF) 1 Page - Analog Devices

No de pièce AD8278BRZ-RL
Description  Low Power, Wide Supply Range, Low Cost Difference Amplifier, G = 쩍, 2
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD8278BRZ-RL Fiches technique(HTML) 1 Page - Analog Devices

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Low Power, Wide Supply Range,
Low Cost Difference Amplifier, G = ½, 2
AD8278
Rev. 0
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
Low power dissipation: 0.5 mW at VS = 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
Wide power supply range:
Single supply: 2 V to 36 V
Dual supplies: ±2 V to ±18 V
8-lead SOIC and MSOP packages
APPLICATIONS
Voltage measurement and monitoring
Current measurement and monitoring
Instrumentation amplifier building block
Portable, battery-powered equipment
Test and measurement
FUNCTIONAL BLOCK DIAGRAM
2
5
3
1
6
7
4
40kΩ
20kΩ
40kΩ
–VS
+VS
–IN
+IN
SENSE
OUT
REF
20kΩ
AD8278
Figure 1.
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)
AD8274
AD8206 (B)
AMP03
AD8216 (B)
1 U = 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 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 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 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.


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