LT1025CN8 Micropower Thermocouple Cold Junction Compensator DIP-8 (LT1025CN8 IC)
The LT1025CN8 is a highly specialized, micropower thermocouple cold junction compensator designed to convert standard thermocouples into accurate centigrade temperature sensors. Housed in an 8-pin DIP package, it supports Type E, J, K, R, S, and T thermocouples. By providing a compensation voltage that precisely matches the thermocouple's characteristics at the cold junction, it eliminates the need for ice baths or complex software compensation, simplifying the design of precise temperature measurement systems.
This IC is a professional-grade solution frequently used in India for industrial process control, high-accuracy digital thermometers, and data acquisition systems. It is particularly valued for its 0.5°C initial accuracy and internal curvature correction circuitry, which ensures linear and accurate compensation across a wide range of ambient temperatures while consuming minimal power.
Key Features
- Multi-Type Support: Provides direct outputs for Type K, J, E, T, R, and S thermocouples.
- High Initial Accuracy: Features a 0.5°C accuracy at room temperature, laser-trimmed at the wafer level.
- Ultra-Low Power: Consumes only 80uA of typical supply current, making it ideal for battery-operated handheld instruments.
- Curvature Correction: Built-in circuitry compensates for the non-linear "bow" found in thermocouple responses.
- Wide Supply Range: Operates reliably on any supply from 4V to 36V.
- Centigrade Output: Includes a 10mV/°C direct temperature output for use as a standalone sensor.
- Standard Package: Available in a breadboard-friendly 8-pin PDIP for easy prototyping and through-hole assembly.
Specifications
- IC Type: Thermocouple Cold Junction Compensator
- Output Sensitivity: 10 mV/°C (Centigrade Output)
- Thermocouple Types: E, J, K, R, S, T
- Initial Accuracy: +/- 0.5°C (at 25°C)
- Supply Voltage: 4V to 36V
- Supply Current: 150 uA (Maximum)
- Package Type: PDIP-8
- Mounting Style: Through-Hole
- Operating Temperature: 0°C to 70°C
Pinout Configuration (8-Pin DIP)
- Pin 1 (E): Output for Type E Thermocouple
- Pin 2 (J): Output for Type J Thermocouple
- Pin 3 (K): Output for Type K Thermocouple
- Pin 4 (GND): Ground
- Pin 5 (T, R, S): Common Output for Type T, R, and S
- Pin 6 (VOUT): 10mV/°C Centigrade Temperature Output
- Pin 7 (V+): Positive Power Supply (4V to 36V)
- Pin 8 (R, S): Specific tap for Type R and S compensation
