User Manual
801
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
10-Bit Analog Digital Converter (ADC1)
(24.7)
Figure 198 IIR filter transfer function for different filter length fl (1MHz corresponds to 1/2*channel
sampling frequency)
24.7.1.1 Step Response
The IIR filter’s step response time is shown in the figure below:
Figure 199 IIR Step Response Time
H
IIR
(z)
=
(1 – a
*
z
-1
)
1 – a
0
1
2
3
4
5
6
x 10
4
-80
-60
-40
-20
0
Frequency (Hz)
P
h
a
s
e (degrees
)
Phase response of 1st order IIR
0
1
2
3
4
5
6
x 10
4
-30
-20
-10
0
Frequency (Hz)
M
agni
tude (
d
B
)
Frequency response of 1st order IIR
a = - 0.9375
a = - 0.5
-2
0
2
4
6
8
x 10
-4
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
Step response of 1st order IIR filter
a = - 0.5
a = - 0.9375