Data Sheet

MLX90640 32x24 IR array
Datasheet
Page 55 of 60
REVISION 11 – 3 AUGUST 2018
Power dissipation within the package may affect performance in two ways: by heating the “ambient” sensitive element
significantly beyond the actual ambient temperature, as well as by causing gradients over the package that will inherently
cause thermal gradient over the cap
Power supply decoupling capacitor is needed as with most integrated circuits. MLX90640Bxx is a mixed-signal device with
sensors, small signal analog part, digital part and I/O circuitry. In order to keep the noise low power supply switching noise
needs to be decoupled. High noise from external circuitry can also affect noise performance of the device. In many
applications a 100nF SMD plus 1µF ceramic capacitors close to the Vdd and Vss pins would be a good choice. It should be
noted that not only the trace to the Vdd pin needs to be short, but also the one to the Vss pin. Using MLX90640Bxx with
short pins improves the effect of the power supply decoupling.
Check www.melexis.com for most recent application notes about MLX90640Bxx.