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AD595CDZ Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD595CDZ Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 8 page FUNCTIONAL BLOCK DIAGRAM 14 13 12 11 10 9 8 OVERLOAD DETECT ICE POINT COMP. +A G G –TC +TC 1 2 345 6 7 AD594/AD595 +IN +C +T COM –T –C V– –IN –ALM +ALM V+ COMP VO FB a Monolithic Thermocouple Amplifiers with Cold Junction Compensation AD594/AD595 FEATURES Pretrimmed for Type J (AD594) or Type K (AD595) Thermocouples Can Be Used with Type T Thermocouple Inputs Low Impedance Voltage Output: 10 mV/ C Built-In Ice Point Compensation Wide Power Supply Range: +5 V to 15 V Low Power: <1 mW typical Thermocouple Failure Alarm Laser Wafer Trimmed to 1 C Calibration Accuracy Setpoint Mode Operation Self-Contained Celsius Thermometer Operation High Impedance Differential Input Side-Brazed DIP or Low Cost Cerdip PRODUCT DESCRIPTION The AD594/AD595 is a complete instrumentation amplifier and thermocouple cold junction compensator on a monolithic chip. It combines an ice point reference with a precalibrated amplifier to produce a high level (10 mV/ °C) output directly from a ther- mocouple signal. Pin-strapping options allow it to be used as a linear amplifier-compensator or as a switched output setpoint controller using either fixed or remote setpoint control. It can be used to amplify its compensation voltage directly, thereby converting it to a stand-alone Celsius transducer with a low impedance voltage output. The AD594/AD595 includes a thermocouple failure alarm that indicates if one or both thermocouple leads become open. The alarm output has a flexible format which includes TTL drive capability. The AD594/AD595 can be powered from a single ended supply (including +5 V) and by including a negative supply, tempera- tures below 0 °C can be measured. To minimize self-heating, an unloaded AD594/AD595 will typically operate with a total sup- ply current 160 µA, but is also capable of delivering in excess of ±5 mA to a load. The AD594 is precalibrated by laser wafer trimming to match the characteristic of type J (iron-constantan) thermocouples and the AD595 is laser trimmed for type K (chromel-alumel) inputs. The temperature transducer voltages and gain control resistors are available at the package pins so that the circuit can be recalibrated for the thermocouple types by the addition of two or three resistors. These terminals also allow more precise cali- bration for both thermocouple and thermometer applications. The AD594/AD595 is available in two performance grades. The C and the A versions have calibration accuracies of ±1°C and ±3°C, respectively. Both are designed to be used from 0°C to +50 °C, and are available in 14-pin, hermetically sealed, side- brazed ceramic DIPs as well as low cost cerdip packages. PRODUCT HIGHLIGHTS 1. The AD594/AD595 provides cold junction compensation, amplification, and an output buffer in a single IC package. 2. Compensation, zero, and scale factor are all precalibrated by laser wafer trimming (LWT) of each IC chip. 3. Flexible pinout provides for operation as a setpoint control- ler or a stand-alone temperature transducer calibrated in degrees Celsius. 4. Operation at remote application sites is facilitated by low quiescent current and a wide supply voltage range +5 V to dual supplies spanning 30 V. 5. Differential input rejects common-mode noise voltage on the thermocouple leads. REV. C 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. 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., 1999 |
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