AD8497CRMZ Ver la hoja de datos (PDF) - Analog Devices

Número de pieza

componentes Descripción

Fabricante

AD8497CRMZ

Precision Thermocouple Amplifiers with Cold Junction Compensation

Analog Devices 

AD8494/AD8495/AD8496/AD8497

A Grade

C Grade

Parameter

Test Conditions/Comments Min

Typ Max

Min

Typ Max

Unit

TEMPERATURE RANGE (TA)

Specified Performance

AD8494/AD8495

0

50

0

50

°C

AD8496/AD8497

25

100

25

100

°C

Operational

−40

+125

−40

+125

°C

1 Ambient temperature rejection specifies the change in the output measurement (in °C) for a given change in temperature of the cold junction. For the AD8494 and

AD8495, ambient temperature rejection is defined as the slope of the line connecting errors calculated at 0°C and 50°C ambient temperature. For the AD8496 and

AD8497, ambient temperature rejection is defined as the slope of the line connecting errors calculated at 25°C and 100°C ambient temperature.

2 Error does not include thermocouple gain error or thermocouple nonlinearity.

3 With a 100 kΩ load, measurement junction temperatures beyond approximately 880°C for the AD8494 and AD8496 and beyond approximately 960°C for the AD8495

and AD8497 require supply voltages larger than 5 V or a negative voltage applied to the reference pin. Measurement junction temperatures below 5°C require either a

positive offset voltage applied to the reference pin or a negative supply.

4 Input stage uses PNP transistors, so bias current always flows out of the part.

5 Large output currents can increase the internal temperature rise of the part and contribute to cold junction compensation (CJC) error.

6 Unbalanced supplies can also be used. Care should be taken that the common-mode voltage of the thermocouple stays within the input voltage range of the part.

Rev. 0 | Page 4 of 16

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