The AD595 series Instrumentation Amplifier with thermocouple cold junction compensator on a monolithic chip. It combines an ice point reference with a pre-calibrated amplifier to produce a high level (10mV/°C) output directly from a thermocouple signal. The 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 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 calibration for both thermocouple and thermometer applications. 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.
Pretrimmed for Type K
Can be used with type T thermocouple inputs
10mV/°C Low impedance voltage output
Built-in ice point compensation
<1mW Typical low power
Laser wafer trimmed to 1°C Calibration accuracy
Self-contained Celsius thermometer operation
High impedance differential input
Differential input rejects common-mode noise voltage on the thermocouple leads
Operation at remote application sites is facilitated by low quiescent current
