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LT1025MJ8 Datasheet(PDF) 7 Page - Linear Technology |
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LT1025MJ8 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LT1025 1025fb 3. Calibrate output by adding in a true offset term which does not affect gain (by summing, etc.). Calibration may be done at any temperature either by immersing the thermocouple in a calibrated bath or by substituting a precision input voltage. The method which tends to minimize worst-case error over the whole TL to TH range is to calibrate at 1/6 or 5/6 of span. This may be modified if best accuracy is desired at one particular point. Breakpoint correction for nonlinearity is more compli- cated than a simple offset, but a single breakpoint com- bined with offset will reduce errors typically by 4:1 over a simple offset technique. APPLICATIO S I FOR ATIO TYPICAL APPLICATIO S – – + + 4 6 7 2 3 –15V 15V –15V –10mV/ °C 15V 3k 300k GND R– K TYPE K C1 0.1 µF C2 1 µF VIN VO VOUT LT1025 LTKA0x†† †† OR EQUIVALENT. SEE “AMPLIFIER CONSIDERATIONS” Eliminating Amplifier Feedback Resistors (Output Goes Negative with Increasing Temperature) Type K Thermometer with Grounded Thermocouple –15V 10mV/ °C VOUT V + V – V – V – GND R– LT1025 – + V + R5 10k R1 1k 1% R6 9.1k R4* 470k R3 255k 1% R2 100 Ω TYPE K 0.1 µF C2 1 µF *R4 ≤ 30 µA MUST BE DECREASED APPROPRIATELY. R4 IS NOT REQUIRED (OPEN) FOR LT1025 TEMPERATURES ≥ 0°C WHEN SOURCING CURRENT ONLY †† OR EQUIVALENT. SEE “AMPLIFIER CONSIDERATIONS” VIN VO IF OUTPUT MUST SINK CURRENT, R4 LTKA0x †† |
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