Data Sheet

MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
All accuracy specifications apply under settled isothermal conditions only.
A version of the MLX90614 with accuracy suited for medical applications is available. The accuracy in the
range Ta 10ºC - 40ºC and To 32ºC - 42ºC is shown in diagram below. The accuracy for the rest of the
temperature ranges is the same as in previous diagram. Medical accuracy specification is only available for
the MLX90614DAA version.
40302010
36
45
32
39
42
± 0.1
o
C
± 0.2
o
C
± 0.2
o
C
± 0.3
o
C ± 0.3
o
C
30
Ta,
o
C
To,
o
C
Figure 18: Preliminary accuracy of MLX90614DAA (Ta,To) for medical applications.
It is very important for the application design to understand that the accuracy specified in Figure 17 and
Figure 18 are only guaranteed when the sensor is in thermal equilibrium and under isothermal conditions
(there are no temperature differences across the sensor package). The accuracy of the thermometer can be
influenced by temperature differences in the package induced by causes like (among others): Hot electronics
behind the sensor, heaters/coolers behind or beside the sensor or when the measured object is so close to
the sensor that it not only radiates on the sensing element in the thermometer but also heats the thermometer
casing.
This effect is especially relevant for thermometers with a small field Of View (FOV) like the -XXC and -XXF as
the energy received by the sensor from the object is reduced. Therefore, Melexis has introduced the -XCX
version of the MLX90614. In these MLX90614-XCC and -XCF, the thermal gradients are measured internally
and the measured temperature is compensated for them. In this way, the MLX90614–XCX is much less
sensitive to thermal gradients induced from outside, but the effect is not totally eliminated. It is therefore
important to avoid introducing strong heat sources close to the sensor or to shield the sensor from them.
3901090614 Page 29 of 42 Data Sheet
Rev 004 30/Jul2008