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PDF AD8230 Data sheet ( Hoja de datos )
| Número de pieza | AD8230 | |
| Descripción | Precision Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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16 V Rail-to-Rail, Zero-Drift,
Precision Instrumentation Amplifier
AD8230
FEATURES
Resistor programmable gain range: 101 to 1000
Supply voltage range: ±4 V to ±8 V
Rail-to-rail input and output
Maintains performance over −40°C to +125°C
Excellent ac and dc performance
110 dB minimum CMR @ 60 Hz, G = 10 to 1000
10 μV maximum offset voltage (RTI, ±5 V operation)
50 nV/°C maximum offset drift
20 ppm maximum gain nonlinearity
APPLICATIONS
Pressure measurements
Temperature measurements
Strain measurements
Automotive diagnostics
GENERAL DESCRIPTION
The AD8230 is a low drift, differential sampling, precision
instrumentation amplifier. Auto-zeroing reduces offset voltage
drift to less than 50 nV/°C. The AD8230 is well-suited for
thermocouple and bridge transducer applications. The
AD8230’s high CMR of 110 dB (minimum) rejects line noise in
measurements where the sensor is far from the instrumentation.
The 16 V rail-to-rail, common-mode input range is useful for
noisy environments where ground potentials vary by several
volts. Low frequency noise is kept to a minimal 3 μV p-p,
making the AD8230 perfect for applications requiring the
utmost dc precision. Moreover, the AD8230 maintains its high
performance over the extended industrial temperature range of
−40°C to +125°C.
Two external resistors are used to program the gain. By using
matched external resistors, the gain stability of the AD8230 is
much higher than instrumentation amplifiers that use a single
resistor to set the gain. In addition to allowing users to program
the gain between 101 and 1000, users can adjust the output
offset voltage.
CONNECTION DIAGRAM
–VS 1
+VS 2
8 VOUT
7 RG
VREF1 3
+IN 4
AD8230
6 VREF2
5 –IN
TOP VIEW
(Not to Scale)
Figure 1. 8-Lead SOIC (R-8)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–50 –30 –10
10 30 50 70 90
TEMPERATURE (°C)
110 130 150
Figure 2. Relative Offset Voltage vs. Temperature
+5V
–5V
0.1µF
0.1µF
2
41
TYPE K THERMOCOUPLE AD8230
8
5
6
3
7
34.8kΩ
VOUT
284Ω
Figure 3. Thermocouple Measurement
The AD8230 is versatile yet simple to use. Its auto-zeroing
topology significantly minimizes the input and output
transients typical of commutating or chopper instrumentation
amplifiers. The AD8230 operates on ±4 V to ±8 V (+8 V to +16 V)
supplies and is available in an 8-lead SOIC.
1 The AD8230 can be programmed for a gain as low as 2, but the maximum
input voltage is limited to approximately 750 mV.
Rev. B
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.
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 ©2004–2007 Analog Devices, Inc. All rights reserved.
1 page  
AD8230
VS = ±8 V, VREF = 0 V, RF = 100 kΩ, RG = 1 kΩ (@ TA = 25°C, G = 202, RL = 10 kΩ, unless otherwise noted).
Table 2.
Parameter
VOLTAGE OFFSET
RTI Offset, VOSI
Offset Drift
COMMON-MODE REJECTION (CMR)
CMR to 60 Hz with 1 kΩ Source Imbalance
VOLTAGE OFFSET RTI vs. SUPPLY (PSR)
G=2
G = 202
GAIN
Gain Range
Gain Error2
G=2
G = 10
G = 100
G = 1000
Gain Nonlinearity
Gain Drift
G = 2, 10, 102
G=1002
INPUT
Input Common-Mode Operating Voltage Range
Over Temperature
Input Differential Operating Voltage Range
Average Input Offset Current3
Average Input Bias Current3
OUTPUT
Output Swing
Over Temperature
Short-Circuit Current
REFERENCE INPUT
Voltage Range4
NOISE
Voltage Noise Density, 1 kHz, RTI
Voltage Noise
SLEW RATE
INTERNAL SAMPLE RATE
POWER SUPPLY
Operating Range (Dual Supplies)
Operating Range (Single Supply)
Quiescent Current
TEMPERATURE RANGE
Specified Performance
Conditions
V+IN = V−IN = 0 V
V+IN = V−IN = 0 V,
T = −40°C to +125°C
VCM = −8 V to +8 V
G = 2(1 + RF/RG)
T = −40°C to +125°C
VCM = 0 V
VCM = 0 V
T = −40°C to +125°C
VIN+, VIN−, VREF = 0 V
f = 0.1 Hz to 10 Hz
VIN = 500 mV, G = 10
T = −40°C to +125°C
Min Typ Max Unit
20 μV
50 nV/°C
110
120
120
101
−VS
−VS
−VS + 0.1
−VS + 0.1
−VS + 3.5
±4
8
−40
120
120
140
1000
0.01 0.04
0.01 0.04
0.01 0.04
0.02 0.05
20
14
60
+VS
+VS
750
33 300
0.15 1
+VS − 0.2
+VS − 0.4
15
+VS − 2.5
240
3
2
6
±8
16
3.2 4
+125
dB
dB
dB
V/V
%
%
%
%
ppm
ppm/°C
ppm/°C
V
V
mV
pA
nA
V
V
mA
V
nV/√Hz
μV p-p
V/μs
kHz
V
V
mA
°C
1 The AD8230 can operate as low as G = 2. However, since the differential input range is limited to approximately 750 mV, the AD8230 configured at G < 10 does not
make use of the full output voltage range.
2 Gain drift is determined by the TC match of the external gain setting resistors.
3 Differential source resistance less than 10 kΩ does not result in voltage offset due to input bias current or mismatched series resistors.
4 For G < 10, the reference voltage range is limited to −VS + 4.24 V to +VS − 2.75V.
Rev. B | Page 4 of 16
5 Page 
AD8230
140
120 G = +100
100
80 G = +1000
60 G = +10
G = +2
40
20
0
0.1 1
FREQUENCY (kHz)
Figure 28. Negative PSR vs. Frequency, RTI
10
10
8 VS = ±8V
–40°C
6
4
VS = ±5V
2
0
–40°C
+125°C
+125°C +25°C
+25°C
–2
–4 VS = ±5V
–6
+125°C
–40°C
+125°C
+25°C
+25°C
–8 VS = ±8V
–10
0
2
–40°C
468
OUTPUT CURRENT (mA)
10
12
Figure 29. Output Voltage Swing vs. Output Current,
−40°C, +25°C, +85°C, +125°C
Rev. B | Page 10 of 16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AD8230.PDF ] | |
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