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AD8251 Scheda tecnica(PDF) 1 Page - Analog Devices

Il numero della parte AD8251
Spiegazioni elettronici  12MHz 20V/us G=1,2,4,8 Programmable Gain iCMOS Instrumentation Amplifier
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD8251 Scheda tecnica(HTML) 1 Page - Analog Devices

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12MHz 20V/μs G=1,2,4,8 Programmable
Gain iCMOS™ Instrumentation Amplifier
Preliminary Technical Data
AD8251
Rev.PrB
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
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2006 Analog Devices, Inc. All rights reserved.
FEATURES
Easy to Use
Programmable Gains: 1, 2, 4, 8
Digital or Pin Programmable Gain Setting
Temp Range -40
°C to 85°C
EXCELLENT DC PERFORMANCE
High CMRR 98dB G=8
Low Gain Drift: 10ppm/
°C
Low Offset Drift: 1uV/
°C
Low Offset: 75uV G=8
EXCELLENT AC PERFORMANCE
Fast Settle Time: 0.5us to 0.01%
High Slew Rate: 20V/μs
High CMRR over Frequency: 80dB to 50kHz
Low Noise: 13nV
√Hz, G=8
Low Power: 3.5 mA (typ)
Supply:
±5V to ±12V
Applications
Data Acquisition
Bio-Medical Analysis
Test and Measurement
High Performance System Monitoring
A1
A0
DGD
WR
Logic
AD8251
OUT
+VS
-VS
REF
+IN
-IN
Figure 1. Functional Block Diagram
GENERAL DESCRIPTION
The AD8251 is a digitally gain programmable
instrumentation amplifier that has high GΩ input
impedance and low distortion making it suitable for sensor
interfacing and driving high sample rate analog to digital
converters. It has high bandwidth of 12MHz, low distortion
and settle time of 0.5us to 0.01%. Offset drift and gain drift
are limited to 1uV/°C and 10ppm/°C respectively. In
addition to its wide input common-voltage range, it boasts a
high common-mode rejection of 80dB at G=1 from DC to
50kHz. The combination of precision DC performance
coupled with high speed capabilities make the AD8251 an
excellent candidate for data acquisition and medical
applications. Furthermore, this monolithic solution
simplifies design, manufacturing and boosts performance of
instrumentation by maintaining tight match of internal
resistors and amplifiers.
The AD8251’s user interface comprises of a parallel port that
allows users to set the gain in one of three different ways. A
two bit word sent to A1 and A2, via a bus may be latched
using the WR input. An alternative is to set the gain within
1μs by using the gain port in transparent mode where the
state of A0 and A1 directly set the gain. The last method is
to strap A1 and A2 to a high or low voltage potential,
permanently setting the gain.
The AD8251 is available in a 10 pin MSOP package and
specified over -40°C to 85°C, making it an excellent solution
for applications where size and packing density are
important considerations.


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