16 V Rail-to-Rail, Zero-Drift,
Precision Instrumentation Amplifier
AD8230
CONNECTION DIAGRAM
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
1
2
3
4
8
7
6
5
–V
+V
V
OUT
S
R
G
S
1
V
V
2
REF
REF
+IN
–IN
AD8230
TOP VIEW
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
(Not to Scale)
Figure 1. 8-Lead SOIC (R-8)
2.0
1.5
20 ppm maximum gain nonlinearity
APPLICATIONS
1.0
Pressure measurements
Temperature measurements
Strain measurements
0.5
0
Automotive diagnostics
–0.5
–1.0
–1.5
–2.0
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.
–50 –30 –10
10
30
50
70
90
110 130 150
TEMPERATURE (°C)
Figure 2. Relative Offset Voltage vs. Temperature
+5V
–5V
0.1µF
0.1µF
2
4
5
1
V
8
TYPE K THERMOCOUPLE
AD8230
OUT
7
6
34.8kΩ
284Ω
3
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.
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
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.
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