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AD8231 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD8231 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 20 page Zero Drift, Digitally Programmable Instrumentation Amplifier AD8231 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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 ©2007 Analog Devices, Inc. All rights reserved. FEATURES Digitally/pin programmable gain G = 1, 2, 4, 8, 16, 32, 64, 128 Specified from −40°C to +125°C 50 nV/°C maximum input offset drift 10 ppm/°C maximum gain drift Excellent dc performance 80 dB minimum CMR, G = 1 15 μV maximum input offset voltage 500 pA maximum bias current 0.7 μV p-p noise (0.1 Hz to 10 Hz) Good ac performance 2.7 MHz bandwidth, G = 1 1.1 V/μs slew rate Rail-to-rail input and output Shutdown/multiplex Extra op amp Single supply range: 3 V to 6 V Dual supply range: ±1.5 V to ±3 V APPLICATIONS Pressure and strain transducers Thermocouples and RTDs Programmable instrumentation Industrial controls Weigh scales FUNCTIONAL BLOCK DIAGRAM IN-AMP LOGIC NC 1 –INA 2 +INA 3 NC 4 +VS 12 –VS 11 OUTA 10 REF 9 OP AMP AD8231 Figure 1. Table 1. Instrumentation/Difference Amplifiers by Category High Performance Low Cost High Voltage Mil Grade Low Power Digital Gain AD8221 AD6231 AD628 AD620 AD6271 AD82311 AD82201 AD85531 AD629 AD621 AD8250 AD8222 AD524 AD8251 AD82241 AD526 AD85551 AD624 AD85561 AD85571 1 Rail-to-rail output. GENERAL DESCRIPTION The AD8231 is a low drift, rail-to-rail, instrumentation ampli- fier with software programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128. The gains are programmed via digital logic or pin strapping. The AD8231 is ideal for applications that require precision performance over a wide temperature range, such as industrial temperature sensing and data logging. Because the gain setting resistors are internal, maximum gain drift is only 10 ppm/°C. Because of the auto-zero input stage, maximum input offset is 15 μV and maximum input offset drift is just 50 nV/°C. CMRR is also guaranteed over temperature at 80 dB for G = 1, increas- ing to 110 dB at higher gains. The AD8231 also includes an uncommitted op amp that can be used for additional gain, differential signal driving or filtering. Like the in-amp, the op amp has an auto-zero architecture, rail- to-rail input, and rail-to-rail output. The AD8231 includes a shutdown feature that reduces current to a maximum of 1 μA. In shutdown, both amplifiers also have a high output impedance. This allows easy multiplexing of multiple amplifiers without additional switches. The AD8231 is specified over the extended industrial tempera- ture range of −40°C to +125°C. It is available in a 4 mm × 4 mm 16-lead LFCSP (chip scale). |
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