Product Summary

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 thermocouple 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, 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 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 calibration 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, sidebrazed ceramic DIPs as well as low cost cerdip packages

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
AD595AQ
AD595AQ

IC THERMOCOUPLE A W/COMP 14CDIP
Data Sheet
0-1: $9.25
1-25: $7.78
25-100: $7.15
100-250: $6.52
250-500: $6.10
500-1000: $5.61
Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
AD590
AD590
Other

Data Sheet
Negotiable 
AD590IH
AD590IH
Other

Data Sheet
Negotiable 
AD590JF
AD590JF

IC TEMP TRANSDUCER 2-TERM 2-CQFP
Data Sheet
0-1: $11.12
1-10: $10.29
10-100: $8.79
100-250: $8.06
250-500: $7.68
500-1000: $7.42
AD590JH
AD590JH

IC TEMP TRANSDUCER 2-TERM TO52-3
Data Sheet
0-1: $5.72
1-10: $5.15
10-25: $4.69
25-100: $4.24
100-250: $3.89
250-500: $3.55
500-1000: $3.09
1000-2500: $3.05
AD590JR
AD590JR

IC TEMP TRANSDUCER 2-TERM 8-SOIC
Data Sheet
0-98: $3.89
AD590JR-REEL
AD590JR-REEL
Analog Devices Inc.
IC TEMP TRANSDUCER 2-TERM 8-SOIC
Data Sheet
Negotiable