LT1025 - Micropower Thermocouple Cold Junction Compensator
Features
- 80µA Supply Current
- 4V to 36V Operation
- 0.5°C Initial Accuracy (A Version)
- Compatible with Standard Thermocouples (E, J, K, R, S, T)
- Auxiliary 10mV/°C Output
- Available in 8-Lead PDIP and SO Packages
Typical Application
Description
The LT™1025 is a micropower thermocouple cold junction compensator for use with type E, J, K, R, S, and T thermocouples. It utilizes wafer level and post-package trimming to achieve 0.5°C initial accuracy. Special curvature correction circuitry is used to match the �bow� found in all thermocouples so that accurate cold junction compensation is maintained over a wider temperature range.
The LT1025 will operate with a supply voltage from 4V to 36V. Typical supply current is 80µA, resulting in less than 0.1°C internal temperature rise for supply voltages under 10V. A 10mV/°C output is available at low impedance, in addition to the direct thermocouple voltages of 60.9µV/°C (E), 51.7µV/°C (J), 40.3µV/°C (K, T) and 5.95µV/°C (R, S). All outputs are essentially independent of power supply voltage.
A special kit is available (LTK001) which contains an LT1025 and a custom tailored thermocouple amplifier. The amplifier and compensator are matched to allow a much tighter specification of temperature error than would be obtained by adding the compensator and amplifier errors on a worst-case basis. The amplifier from this kit is available separately as LTKA0x.
The LT1025 is available in either an 8-pin PDIP or 8-pin SO package for temperatures between 0°C and 70°C.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
SO-8, DIP-8
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LT1025ACN8 | PDIP | 8 | C | $5.75 | $4.60 | View |
| LT1025ACN8#PBF | PDIP | 8 | C | $5.75 | $4.60 | View |
| LT1025CN8 | PDIP | 8 | C | $3.08 | $2.55 | View |
| LT1025CN8#PBF | PDIP | 8 | C | $3.08 | $2.55 | View |
| LT1025CS8 | SO | 8 | C | $4.21 | $2.95 | View |
| LT1025CS8#PBF | SO | 8 | C | $4.21 | $2.95 | View |
| LT1025CS8#TR | SO | 8 | C | $3.01 | View | |
| LT1025CS8#TRPBF | SO | 8 | C | $3.01 | View | |
| LT1025MJ8 | CERDIP | 8 | M | $30.30 | View | |
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Demo Boards
Linear Technology demo boards are offered free of charge to qualified customers. Contact your local sales office or distributor to request a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.Click here to view our complete list of demo boards
Applications
- Thermocouple Cold Junction Compensator
- Centigrade Thermometer
- Temperature Compensation Network
Simulate
LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.