MLX90247_04 ETC2 [List of Unclassifed Manufacturers], MLX90247_04 Datasheet - Page 6

• Manufacturer Part Number: MLX90247_04
• Description: Discrete Infrared Thermopile Detectors
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

7. Applications information
As shown in the internal schematics drawings in paragraph 5, the MLX90247BAA and BAL use a die with
additional protection diodes for very high ESD performance. The configuration of the protection diodes is
such that the MLX90247BAA and BAL can only be biased around ground potential.
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 common mode 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]
Using the MLX90247DSA or DSL, the ESD performance is lower, but there is the possibility to apply a
non-zero bias voltage Vref to the thermopile. The figure below shows a typical application with the
AD8628 low-offset low-drift differential opamp of Analog Devices. The AD8628 has single voltage supply,
and can only accept positive common mode input signals. This application is not possible with the
M:X90247BAA or BAL, as the BAA and BAL cannot be biased with Vref.
3901090247
Rev. 003
Vref
Vref
MLX90247
MLX90247
MLX90247
MLX90247
MLX90601KZA-CKA
MLX90601KZA-CKA
MLX90601KZA-CKA
MLX90601KZA-CKA
MLX90601KZA-CKA
MLX90601KZA-CKA
MLX90601KZA-CKD
MLX90601KZA-CKD
MLX90601KZA-CKD
MLX90601KZA-CKD
MLX90601KZA-CKD
MLX90601KZA-CKD
MLX90601KZA-CLA
MLX90601KZA-CLA
MLX90601KZA-CLA
MLX90601KZA-CLA
MLX90601KZA-CLA
MLX90601KZA-CLA
Rsens
Rsens
Rsens
Rsens
VSS
VSS
VSS
VSS
IR+
IR+
IR+
IR+
IR-
IR-
IR-
IR-
MLX90247DSA
MLX90247DSA
60kΩ
60kΩ
100Ω
100Ω
IRINP
IRINP
IRINP
IRINP
IRINN
IRINN
IRINN
IRINN
TINP
TINP
TINP
TINP
TINN
TINN
TINN
TINN
CREF
CREF
CREF
CREF
MLX90313
MLX90313
MLX90313
MLX90313
Vthermopile
Vthermopile
R3
R3
R3
R3
VSS
VSS
VSS
VSS
TEMPOUT
TEMPOUT
TEMPOUT
TEMPOUT
VREFP
VREFP
VREFP
VREFP
IROUT
IROUT
IROUT
IROUT
VDD
VDD
VDD
VDD
REL1
REL1
REL1
REL1
SCLK
SCLK
SCLK
SCLK
SDO
SDO
SDO
SDO
SDI
SDI
SDI
SDI
CS
CS
CS
CS
R3 = 100k Ω
R3 = 100k Ω
R3 = 100k Ω
R3 = 100k Ω
C3 = 10 µ F
C3 = 10 µ F
C3 = 10 µ F
C3 = 10 µ F
+
+
-
-
100kΩ
100kΩ
5V
5V
C3
C3
C3
C3
C3
C3
TEMPOUT
TEMPOUT
TEMPOUT
TEMPOUT
VSS/GND
VSS/GND
VSS/GND
VSS/GND
VSS/GND
VSS/GND
5V
5V
5V
5V
CS
CS
CS
CS
SCLK
SCLK
SCLK
SCLK
DIN
DIN
DIN
DIN
DOUT
DOUT
DOUT
DOUT
REL
REL
REL
REL
VREF
VREF
VREF
VREF
IROUT
IROUT
IROUT
IROUT
Discrete Infrared Thermopile Detectors
Page 6 of 10
MLX90247 family
Data Sheet
Jun/04