AD594/595 is monolithic thermocouple amplifierswith cold junction compensation for J type thermocouple. Could it be used with N type thermocouple?
AD594 and AD595 are Pretrimmed for Type J (AD594) or Type K (AD595) Thermocouples. But they can be used with other type after calibration. Below is an application note AN639 about the thermocouple signal conditioning, FYI. http://www.analog.com/media/en/technical-documentation/application-notes/AN-369.pdf