MLX90316KDC-BDG Datasheet, PDF (25/45 Pages) Melexis Microelectronic Systems – Rotary Position Sensor IC

MLX90316
Rotary Position Sensor IC
14.5.3. IIR Filters
The IIR Filter is enabled with Filter = 6. The diagram of the IIR Filter implemented in the MLX90316 is
given in Figure 12. Only the parameter A1 and A2 are configurable (See Table 2).
b₀ = 1
x(n)
y(n)
Z^-1
b₁ = 2
Z^-1
-a₁
Z^-1
b₂ = 1
Z^-1
-a₂
Figure 12 - IIR Diagram
Filter No
Type
Title
90% Response Time
Efficiency RMS (dB)
Efficiency P2P (dB)
Coefficient A1
Coefficient A2
11
9.9
12.9
26112
10752
16
11.4
14.6
28160
12288
6
2^nd Order Infinite Impulse Response (IIR)
Medium & Strong
26
40
52
13.6
15.3
16.2
17.1
18.8
20
29120
30208
31296
12992
13952
14976
Table 2 - IIR Filter Selection Table
100
>20
>20
31784
15412
The Figure 13 shows the response of the filter to a Gaussian noise with default coefficient A1 and A2.
3901090316
Rev10
Page 25 of 45
Jul/13