Data Sheet

MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
3901090614 Page 13 of 42 Data Sheet
Rev 004 30/Jul2008
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
MLX90614 AAA, BAA, DAA 0.10 0.05 100%
MLX90614 ABA, BBA 0.14 0.07 100%
MLX90614 ACC, BCC 0.14 0.18 100%
MLX90614 ACF, BCF 1.33 0.10 50%
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 they give are listed below. Settling time depends on three
configurations: single/dual zone, IIR filter settings and FIR filter settings. The FIR filter has a straightforward
effect on noise (a 4 times decrease of settling time increases the noise 2 times and vice versa). The IIR filter
provides an additional, spike limiting, feature. Spike limit is also listed and defines to what level the magnitude
of a 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. More details are available in the application
notes from www.melexis.com
IIR setting FIR setting
Settling time (s)
90614xAx
Settling time (s)
90614xBx, 90614xCx
Spike limit
xxx 000…011 Not recommended
100 100 0.04 0.06 100.0%
100 101 0.05 0.07 100.0%
100 110 0.06 0.10 100.0%
100 111 0.10 0.14 100.0%
101 100 0.12 0.20 80.0%
101 101 0.16 0.24 80.0%
101 110 0.22 0.34 80.0%
101 111 0.35 0.54 80.0%
110 100 0.24 0.38 66.7%
110 101 0.30 0.48 66.7%
110 110 0.43 0.67 66.7%
110 111 0.70 1.10 66.7%
111 100 0.26 0.42 57.0%
111 101 0.34 0.53 57.0%
111 110 0.48 0.75 57.0%
111 111 0.78 1.20 57.0%
000 100 0.30 0.47 50.0%
000 101 0.37 0.60 50.0%
000 110 0.54 0.84 50.0%
000 111 0.86 1.33 50.0%
001 100 0.70 1.10 25.0%
001 101 0.88 1.40 25.0%
001 110 1.30 2.00 25.0%
001 111 2.00 3.20 25.0%
010 100 1.10 1.80 16.7%
010 101 1.40 2.20 16.7%
010 110 2.00 3.20 16.7%
010 111 3.30 5.00 16.7%
011 100 1.50 2.40 12.5%
011 101 1.90 3.00 12.5%
011 110 2.80 4.30 12.5%
011 111 4.50 7.00 12.5%
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.