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ADT70GR 数据表(PDF) 1 Page - Analog Devices |
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ADT70GR 数据表(HTML) 1 Page - Analog Devices |
1 / 14 page FUNCTIONAL BLOCK DIAGRAM RGA RGB INIA +INIA INST AMP SHUT- DOWN GND SENSE OUTIA AGND DGND VS SHUTDOWN +INOA INOA OUTOA +VS 2.5V REF IOUTA IOUTB MATCHED CURRENT SOURCES NULLA NULLB BIAS 2.5VREFOUT ADT70 PIN CONFIGURATIONS 20-Lead P-DIP (N Suffix) SHUTDOWN 14 13 12 11 17 16 15 20 19 18 10 9 8 1 2 3 4 7 6 5 –VS +INOA –INOA VOUT OA +VS AGND VREFOUT BIAS VOUT IA DGND NULLA NULLB IOUTA IOUTB –INIA +INIA RGA RGB GND SENSE a ADT70 TOP VIEW (Not to Scale) 20-Lead SOIC (R Suffix) 14 13 12 11 17 16 15 20 19 18 10 9 8 1 2 3 4 7 6 5 –VS +INOA –INOA VOUT OA +VS AGND VREFOUT BIAS VOUT IA DGND SHUTDOWN NULLA NULLB IOUTA IOUTB INIA INIA RGA RGB GND SENSE ADT70 TOP VIEW (Not to Scale) a REV. 0 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a PRTD Conditioning Circuit and Temperature Controller ADT70* FEATURES PRTD Temperature Measurement Range Typical IC Measurement Error 1 C Includes Two Matched Current Sources Rail-to-Rail Output Instrumentation Amp Uncommitted, Rail-to-Rail Output Op Amp On-Board 2.5 V Reference Temperature Coefficient 25 ppm/ C 5 V or 5 V Operation Supply Current 4 mA Max 10 A Max in Shutdown APPLICATIONS Temperature Controllers Portable Instrumentation Temperature Acquisition Cards GENERAL DESCRIPTION The ADT70 provides excitation and signal conditioning for resistance-temperature devices (RTDs). It is ideally suited for 1 k Ω Platinum RTDs (PRTDs), allowing a very wide range of temperature measurement. It can also easily interface to 100 Ω PRTDs. Using a remote, low cost thin-film PRTD, the ADT70 can measure temperature in the range of –50 °C to +500°C. With high performance platinum elements, the temperature change can be extended to 1000 °C. Accuracy of the ADT70 and PRTD system over a –200 °C to +1000°C temperature range heavily depends on the quality of the PRTD. Typically the ADT70 will introduce an error of only ±1°C over the transducer's temperature range, and the error may be trimmed to zero at a single calibration point. The ADT70 consists of two matched 1 mA (nominal) current sources for transducer and reference resistor excitation, a preci- sion rail-to-rail output instrumentation amplifier, a 2.5 V refer- ence and an uncommitted rail-to-rail output op amp. The ADT70 includes a shutdown function for battery powered equipment, which reduces the quiescent current from 4 mA to less than 10 µA. The ADT70 operates from either single +5 V or ±5 V supplies. Gain or full-scale range for the PRTD and ADT70 system is set by a precision external resistor connected to the instrumentation amplifier. The uncommitted op amp may be used for scaling the internal voltage reference, providing a “PRTD open” signal or “over-temperature” warning, a heater switching signal, or other external conditioning determined by the user. The ADT70 is specified for operation from 40 °C to 125°C and is available in 20-lead DIP and SO packages. *Patent pending. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998 |
类似零件编号 - ADT70GR |
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类似说明 - ADT70GR |
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