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PDF AD8225 Data sheet ( Hoja de datos )
| Número de pieza | AD8225 | |
| Descripción | Precision Gain of 5 Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD8225 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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Precision Gain of 5
Instrumentation Amplifier
AD8225
FEATURES
No External Components Required
Highly Stable, Factory Trimmed Gain of 5
Low Power, 1.2 mA Max Supply Current
Wide Power Supply Range (؎1.7 V to ؎18 V)
Single- and Dual-Supply Operation
Excellent Dynamic Performance
High CMRR
86 dB Min @ DC
80 dB Min to 10 kHz
Wide Bandwidth
900 kHz
4 V to 36 V Single Supply
High Slew Rate
5 V/s Min
Outstanding DC Precision
Low Gain Drift
5 ppm/؇C Max
Low Input Offset Voltage
150 V Max
Low Offset Drift
2 V/؇C Max
Low Input Bias Current
1.2 nA Max
APPLICATIONS
Patient Monitors
Current Transmitters
Multiplexed Systems
4 to 20 mA Converters
Bridge Transducers
Sensor Signal Conditioning
FUNCTIONAL BLOCK DIAGRAM
NC 1
–IN 2
+IN 3
–VS 4
AD8225
8 NC
7 +VS
6 VOUT
5 REF
NC = NO CONNECT
140
130
120
110
100
90
80
HIGH PERFORMANCE IN AMP
@ GAIN OF 5
70
AD8225
60
50
40
30
1 10 100 1k 10k 100k
FREQUENCY – Hz
Figure 1. Typical CMRR vs. Frequency
GENERAL DESCRIPTION
The AD8225 is an instrumentation amplifier with a fixed gain
of 5, which sets new standards of performance. The superior
CMRR of the AD8225 enables rejection of high frequency
common-mode voltage (80 dB Min @ 10 kHz). As a result,
higher ambient levels of noise from utility lines, industrial
equipment, and other radiating sources are rejected. Extended
CMV range enables the AD8225 to extract low level differential
signals in the presence of high common-mode dc voltage levels
even at low supply voltages.
Ambient electrical noise from utility lines is present at 60 Hz
and harmonic frequencies. Power systems operating at 400 Hz
create high noise environments in aircraft instrument clusters.
Good CMRR performance over frequency is necessary if power
system generated noise is to be rejected. The dc to 10 kHz
REV. A
CMRR performance of the AD8225 rejects noise from utility
systems, motors, and repair equipment on factory floors, switch-
ing power supplies, and medical equipment.
Low input bias currents combined with a high slew rate of 5 V/µs
make the AD8225 ideally suited for multiplexed applications.
The AD8225 provides excellent dc precision, with maximum
input offset voltage of 150 µV and drift of 2 µV/°C. Gain drift is
5 ppm/°C or less.
Operating on either single or dual supplies, the fixed gain of 5
and wide input common-mode voltage range make the AD8225
well suited for patient monitoring applications.
The AD8225 is packaged in an 8-lead SOIC package and is
specified over the standard industrial temperature range, –40°C
to +85°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. 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 © 2003 Analog Devices, Inc. All rights reserved.
1 page  
AD8225
SPECIFICATIONS (TA = 25؇C, VS = 5 V, RL = 2 k⍀, unless otherwise noted.)
Parameter
Conditions
Min Typ
GAIN
Gain
Gain Error
Nonlinearity
vs. Temperature
5
–0.1 +0.05
2
1
OFFSET VOLTAGE (RTI)
Offset Voltage
vs. Temperature
vs. Supply
150
90 100
INPUT
Input Operating Impedance
Differential
Common Mode
Input Voltage Range
(Common-Mode)
vs. Temperature
Input Bias Current
vs. Temperature
Input Offset Current
vs. Temperature
Common-Mode Rejection Ratio
TA = TMIN to TMAX
f = 10 kHz*
1.6
1.7
86
83
80
10ʈ2
10ʈ2
0.5
3
0.15
1.5
94
OUTPUT
Operating Voltage Range
vs. Temperature
Operating Voltage Range
vs. Temperature
Short Circuit Current
RL = 2 kΩ
RL = 10 kΩ
0.8
0.9
0.8
0.9
18
DYNAMIC RESPONSE
Small Signal –3 dB Bandwidth
Full Power Bandwidth
Settling Time (0.01%)
Settling Time (0.001%)
Slew Rate
VOUT = 3.2 V p-p
2 V Step
2 V Step
5
900
420
3.3
5.1
NOISE (RTI)
Voltage
Current
0.1 Hz to 10 Hz
Spectral Density, 1 kHz
0.1 Hz to 10 Hz
Spectral Density, 1 kHz
1.5
45
4
50
REFERENCE INPUT
RIN
IIN
Voltage Range
Gain to Output
0.4
0.999
18
60
1
POWER SUPPLY
Operating Range
Quiescent Current
3.4
1.05
TEMPERATURE RANGE
For Specified Performance
–40
*Pin 1 connected to Pin 4. See Applications section.
Specifications subject to change without notice.
–4–
Max
+0.1
10
5
375
2
Unit
V/V
%
± ppm
± ppm/°C
±µV
±µV/°C
dB
VS – 1.05
VS – 1.0
1.2
0.5
VS – 1.05
VS – 1.2
VS – 1.0
VS – 1.0
VS – 0.9
1.001
36
1.2
+85
GΩʈpF
GΩʈpF
V
V
nA
pA/°C
nA
pA/°C
dB
dB
dB
V
V
V
V
mA
kHz
kHz
µs
µs
V/µs
µV p-p
nV/√Hz
pA p-p
fA/√Hz
kΩ
µA
V
V
mA
°C
REV. A
5 Page 
AD8225
Test Circuits
G=5
AD8225
G = 100
AD797
G = 100
LPF
SCOPE
Test Circuit 1. 1 Hz to 10 Hz Voltage Noise Test
4k⍀
G=5
AD8225
100⍀
20k⍀
2k⍀
G = 101
AD829
2k⍀
20⍀
Test Circuit 2. Settling Time to 0.01%
–10–
REV. A
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AD8225.PDF ] | |
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