Features: `Low Cost`Operates with Type J (AD596) or Type K (AD597) Thermocouples`Built-In Ice Point Compensation`Temperature Proportional Operation 10 mV/8C`Temperature Setpoint Operation ON/OFF`Programmable Switching Hysteresis`High Impedance Differential InputSpecifications AD596AH ...
AD596*: Features: `Low Cost`Operates with Type J (AD596) or Type K (AD597) Thermocouples`Built-In Ice Point Compensation`Temperature Proportional Operation 10 mV/8C`Temperature Setpoint Operation ON/OFF`P...
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AD596AH |
AD597AH |
AD597AR |
||
Ratings |
Units | |||
+VS to VS |
0to36 |
V | ||
Common-Mode Input Voltage |
(VS0.15)to+VS |
V | ||
Differential Input Voltage |
VSto +VS |
V | ||
+ALM |
VSto(VS +36) |
|||
ALM |
VSto+VS |
V | ||
Operating Temperature Range |
55to+125 |
40to+125 |
V | |
Output Short Circuit to Common |
Indefinite |
°C |
The AD596/AD597 is a monolithic temperature setpoint controller 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 thermocouple input to derive an internal signal proportional to temperature.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 standalone 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 mA, 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 thermocouple signals covering the entire 200°C to +760°C temperature 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.