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MLX90247 family
Discrete Infrared Thermopile Detectors
8. Applications information
The output voltage of the thermopile is positive when the object is at higher temperature than the sensor;
it is negative when the object is at lower temperature than the sensor. As the output voltage can become
positive as well as negative, the sensor has to be connected to a differential amplifier that can accept both
positive and negative input signals. The figure below shows a solution using the MLX90313 infrared
sensor interface chip, which accepts common mode input voltages in the range [-0.1V;Vdd-3V]
IR+
IRINP
VDD
C3
5V
IR-
IRINN
Rsens
TINP
TEMPOUT
TEMPOUT
VSS
MLX90247
TINN IROUT
MLX90313
CS
SCLK
SDI
SDO
REL1
IROUT
CS
SCLK
DIN
DOUT
REL
CREF
VSS
VREFP
VREF
VSS/GND
R3
MLX90601KZA-CKA
MLX90601KZA-CKD
MLX90601KZA-CLA
R3 = 100k ?
C3 = 10 μ F
The figure below shows a typical application with the AD8628 low-offset low-drift differential opamp from
Analog Devices. The AD8628 has single voltage supply, and can only accept positive common mode
input signals. Vref sets the output offset (output voltage when To=Ta).
100 ? 100k ?
5V
-
MLX90247DSA
+
Vref
60k ?
Vthermopile
3901090247
Rev. 004
Page 6 of 9
Data Sheet
Oct/07
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