Data Sheet

MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
3901090614 Page 13 of 52 Data Sheet
Rev 008 February 28, 2013
On-chip filtering and settling time:
The MLX90614 features configurable on-chip digital filters. They allow customization for speed or noise.
Factory default configurations and the typical settling time and noise for the MLX90614 family are given below.
Device Settling time, sec Typical noise, °C rms Spike limit
MLX90614AAA, BAA, DAA 0.10 0.05 100%
MLX90614ABA, BBA 0.14 0.07 100%
MLX90614ACC, BCC 0.14 0.18 100%
MLX90614ACF, BCF 1.33 0.10 50%
MLX90614DCH, DCI, BCH, BCI 0.65 0.10 80%
Table 8: factory default IIR and FIR configuration, settling time and typical noise
Details on the filters are given in the application note “Understanding MLX90614 on-chip digital signal
filters” available from www.melexis.com.
The evaluation board, EVB90614 supported by PC SW allows easy configuration of the filters, while not
requiring in-depth understanding of the EEPROM.
The available filter settings and the settling times are listed below. Settling time depends on three
configurations: single / dual zone, IIR filter settings and FIR filter settings. The FIR filter has a straight forward
effect on noise (4 times decreasing of filter strength increases the noise 2 times and vice versa. The IIR filter
provides an additional, spike limiting feature. Spike limit defines the level of magnitude to which the spike would
be limited – for example, 25% denotes that if a 20°C temperature delta spike is measured the temperature
reading by the MLX90614 will spike only 5°C.
Settling time (s) Settling time (s)
90614xAx 90614xBx, 90614xCx
xxx 000…011
100 100 0.04 0.06 100.00%
100 101 0.05 0.07 100.00%
100 110 0.06 0.10 100.00%
100 111 0.10 0.14 100.00%
101 100 0.12 0.20 80.00%
101 101 0.16 0.24 80.00%
101 110 0.22 0.34 80.00%
101 111 0.35 0.54 80.00%
110 100 0.24 0.38 66.70%
110 101 0.30 0.48 66.70%
110 110 0.43 0.67 66.70%
110 111 0.70 1.10 66.70%
111 100 0.26 0.42 57.00%
111 101 0.34 0.53 57.00%
111 110 0.48 0.75 57.00%
111 111 0.78 1.20 57.00%
000 100 0.30 0.47 50.00%
000 101 0.37 0.60 50.00%
000 110 0.54 0.84 50.00%
000 111 0.86 1.33 50.00%
001 100 0.70 1.10 25.00%
001 101 0.88 1.40 25.00%
001 110 1.30 2.00 25.00%
001 111 2.00 3.20 25.00%
010 100 1.10 1.80 16.70%
010 101 1.40 2.20 16.70%
010 110 2.00 3.20 16.70%
010 111 3.30 5.00 16.70%
011 100 1.50 2.40 12.50%
011 101 1.90 3.00 12.50%
011 110 2.80 4.30 12.50%
011 111 4.50 7.00 12.50%
Not recommended
FIR settingIIR setting Spike limit
Table 9: possible IIR and FIR settings
Note: Settling time is in seconds and depends on internal oscillator absolute value.
100% spike limit appears with the IIR filter bypassed, and there is no spike limitation.