AC1226 ,Micropower Thermocouple Cold Junction CompensatorAPPLICATIONS
Thermocouple Cold Junction Compensator
Centigrade Thermometer
Temperature Compe ..
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AC1226
Micropower Thermocouple Cold Junction Compensator
APPLICATIONS
Thermocouple Cold Junction Compensator
Centigrade Thermometer
Temperature Compensation Network
PRODUCT DESCRIPTION
The AC1226 is a micropower thermocouple cold junction com-
pensator for use with type E, J, K, R, S and T thermocouples.
It utilizes wafer level and post-package trimming to achieve' typi-
cal 05°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 AC1226 will operate with a supply voltage from 4V to 36V.
VIN
BOW
CORRECTION
VOLTAG E
10mV/°C
TEMPERATURE
SENSOR
GND Vo 10mVI°C
Micropower Thermocouple
Cold Junction Compensator
g _
E 60.hnfloC
Typical supply current is 80pA, resulting in less than 0.1°C
internal temperature rise for supply voltages under 10V. A
10mWC output is available at low impedance in addition to the
direct thermocouple voltages of 60.9wW'C (E), 51.7wVf'C (J),
40.3wVf'C (K, T) and 5.95wVf'C (R, S). All outputs are essen-
tially independent of power supply voltage.
The AC1226 is available in an 8-pin plastic miniDIP for temper-
atures between 0 and +70°C.
R- COMMON
K, T 40.6pVI°C
J 51.7p.V/°C R, s suvr’c
AC 1226 Block Diagram
Information furnished by Analog Devices is believed to be, accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use; nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way; P.O. Box 9106; Norwood, MA 02062-9106
Tel: 617/329-4700 TWX: 710/394-6577
West Coast Atlantic
714/641-9391 215/643-7790
Central
214/231 -5094
