Datasheet AD8230 (Analog Devices)

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16 V Rail-to-Rail, Zero-Drift, Precision Instrumentation Amplifier AD8230 FEATURES CONNECTION DIAGRAM Resistor programmable gain range: 101 to 1000 –V 1 8 S VOUT Supply voltage range: ±4 V to ±8 V +V 2 7 R S G Rail-to-rail input and output V 3 6 V REF1 REF2 Maintains performance over −40°C to +125°C +IN 4 5 –IN Excellent ac and dc performance AD8230
41
110 dB minimum CMR @ 60 Hz, G = 10 to 1000 TOP VIEW
0 3-
(Not to Scale)
506
10 μV maximum offset voltage (RTI, ±5 V operation)
0 Figure 1. 8-Lead SOIC (R-8)
50 nV/°C maximum offset drift 2.0 20 ppm maximum gain nonlinearity 1.5 APPLICATIONS I) 1.0 T Pressure measurements V R µ 0.5 Temperature measurements E ( G Strain measurements A T 0 L Automotive diagnostics VO –0.5 SET F F –1.0 GENERAL DESCRIPTION O –1.5
1 The AD8230 is a low drift, differential sampling, precision 00 3- 06 instrumentation amplifier. Auto-zeroing reduces offset voltage
–2.0
05
–50 –30 –10 10 30 50 70 90 110 130 150
drift to less than 50 nV/°C. The AD8230 is well-suited for
TEMPERATURE (°C)
thermocouple and bridge transducer applications. The Figure 2. Relative Offset Voltage vs. Temperature AD8230’s high CMR of 110 dB (minimum) rejects line noise in
+5V
measurements where the sensor is far from the instrumentation.
–5V
The 16 V rail-to-rail, common-mode input range is useful for
0.1µF
noisy environments where ground potentials vary by several
0.1µF
volts. Low frequency noise is kept to a minimal 3 μV p-p,
2
making the AD8230 perfect for applications requiring the
4 1
utmost dc precision. Moreover, the AD8230 maintains its high
TYPE K THERMOCOUPLE AD8230 8 VOUT 5 7
performance over the extended industrial temperature range of
6 3 34.8kΩ
−40°C to +125°C.
284Ω
Two external resistors are used to program the gain. By using 2 matched external resistors, the gain stability of the AD8230 is 00 3- much higher than instrumentation amplifiers that use a single 06 05 resistor to set the gain. In addition to allowing users to program Figure 3. Thermocouple Measurement the gain between 101 and 1000, users can adjust the output The AD8230 is versatile yet simple to use. Its auto-zeroing offset voltage. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. 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. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2004–2007 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION CONNECTION DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL CHARACTERISTICS ESD CAUTION TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION SETTING THE GAIN LEVEL-SHIFTING THE OUTPUT SOURCE IMPEDANCE AND INPUT SETTLING TIME INPUT VOLTAGE RANGE INPUT PROTECTION POWER SUPPLY BYPASSING POWER SUPPLY BYPASSING FOR MULTIPLE CHANNEL SYSTEMS LAYOUT APPLICATIONS OUTLINE DIMENSIONS ORDERING GUIDE