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AD596 데이터시트(PDF) 1 Page - Analog Devices |
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AD596 데이터시트(HTML) 1 Page - Analog Devices |
1 / 8 page FUNCTIONAL BLOCK DIAGRAM 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Thermocouple Conditioner and Setpoint Controller AD596*/AD597* FEATURES Low Cost Operates with Type J (AD596) or Type K (AD597) Thermocouples Built-In Ice Point Compensation Temperature Proportional Operation – 10 mV/ C Temperature Setpoint Operation – ON/OFF Programmable Switching Hysteresis High Impedance Differential Input GENERAL DESCRIPTION The AD596/AD597 is a monolithic temperature setpoint con- troller that has been optimized for use at elevated temperatures such as those found in oven control applications. The device cold junction compensates and amplifies a type J or K thermo- couple input to derive an internal signal proportional to tem- perature. The internal signal is then compared with an externally applied setpoint voltage to yield a low impedance switched output voltage. Dead-Band or switching hysteresis can be programmed using a single external resistor. Alternately, the AD596/AD597 can be configured to provide a voltage output (10 mV/ °C) directly from a type J or K thermocouple signal. It can also be used as a stand- alone voltage output temperature sensor. The AD596/AD597 can be powered with a single supply from +5 V to +30 V, or dual supplies up to a total span of 36 V. Typical quiescent supply current is 160 µA, which minimizes self-heating errors. The AD596/AD597 H package option includes a thermocouple failure alarm that indicates an open thermocouple lead when operated in the temperature proportional measurement mode. The alarm output has a flexible format which can be used to drive relays, LEDs or TTL logic. The device is packaged in a reliability qualified, cost effective 10-pin metal can or SOIC and is trimmed to operate over an ambient temperature range from +25 °C to +100°C. Operation over an extended ambient temperature range is possible with slightly reduced accuracy. The AD596 will amplify thermo- couple signals covering the entire –200 °C to +760°C tempera- ture range recommended for type J thermocouples while the AD597 can accommodate –200 °C to +1250°C type K inputs. The AD596/AD597 has a calibration accuracy of ±4°C at an ambient temperature of 60 °C and an ambient temperature stability specification of 0.05 °C/°C from +25°C to +100°C. If higher accuracy, or a lower ambient operating temperature is required, either the AD594 (J thermocouple) or AD595 (K thermocouple) should be considered. *Protected by U.S. Patent No. 4,029,974. PRODUCT HIGHLIGHTS 1. The AD596/AD597 provides cold junction compensation and a high gain amplifier which can be used as a setpoint comparator. 2. The input stage of the AD596/AD597 is a high quality in- strumentation amplifier that allows the thermocouple to float over most of the supply voltage range. 3. Linearization not required for thermocouple temperatures close to 175 °C (+100°C to +540°C for AD596). 4. Cold junction compensation is optimized for ambient tem- peratures ranging from +25 °C to +100°C. 5. In the stand-alone mode, the AD596/AD597 produces an output voltage that indicates its own temperature. 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 TO-100 + – G FB VOUT +ALM +IN V– V+ A + ICE POINT COMP + AD596/ AD597 –ALM –IN HYS GND + – G SOIC +IN –IN TOP VIEW (Not to Scale) AD597 G – + + G – + A + ICE POINT COMP HYS V+ GND VOUT V– FB 1 2 3 45 6 7 8 |
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