AD595 Datasheet | Analog Devices

FEATURES Pretrimmed for Type J (AD594) or Type K (AD595) Thermocouples Can Be Used with Type T Thermocouple Inputs Low Impedance Voltage Output: 10 m V/؇ C Built-In Ice Point pensation Wide Power Supply Range: +5 V to ؎15 V Low Power: <1 m W 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 Monolithic Thermocouple Amplifiers with Cold Junction pensation AD594/AD595 FUNCTIONAL BLOCK DIAGRAM - IN 14 - ALM 13 +ALM 12 V+ 11 P 10 VO 9 FB 8 OVERLOAD DETECT AD594/AD595 +A G +TC ICE POINT P. - TC 1 +IN 2 +C 3 +T - T - C 7 V- PRODUCT DESCRIPTION The AD594/AD595 is a plete instrumentation amplifier and thermocouple cold junction pensator on a monolithic chip. It bines an ice point reference with a precalibrated amplifier to produce a high level (10 m V/°C) output directly from a thermocouple signal. Pin-strapping options allow it to be used as a linear amplifier-pensator or as a switched output setpoint controller using either fixed or remote setpoint control. It can be used to amplify its pensation 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 bee 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, temperatures below 0°C can be measured. To minimize self-heating, an unloaded AD594/AD595 will typically operate with a total supply current 160 µA, but is also capable of delivering in excess of ± 5 m A 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)...