Figure 31. iir filter stages, Table 16. iir filter characteristics, Are described in figure 31 and table 16 – Cirrus Logic CS5378 User Manual
Page 54: Cs5378, Iir filters
CS5378
DS639F3
54
IIR1 – Single stage, no decimation
1
st
order no decimation, 3 coefficients
Coefficient set 0: high-pass, corner 0.15% f
s
(3 Hz at 2000 SPS)
Coefficient set 1: high-pass, corner 0.30% f
s
(3 Hz at 1000 SPS)
Coefficient set 2: high-pass, corner 0.60% f
s
(3 Hz at 500 SPS)
Coefficient set 3: high-pass, corner 0.90% f
s
(3 Hz at 333 SPS)
Coefficient set 4: high-pass, corner 1.20% f
s
(3 Hz at 250 SPS)
IIR2 – Single stage, no decimation
2
nd
order no decimation, 5 coefficients
Coefficient set 0: high-pass, corner 0.15% f
s
(3 Hz at 2000 SPS)
Coefficient set 1: high-pass, corner 0.30% f
s
(3 Hz at 1000 SPS)
Coefficient set 2: high-pass, corner 0.60% f
s
(3 Hz at 500 SPS)
Coefficient set 3: high-pass, corner 0.90% f
s
(3 Hz at 333 SPS)
Coefficient set 4: high-pass, corner 1.20% f
s
(3 Hz at 250 SPS)
IIR3 – Two stage, no decimation
3
rd
order no decimation, 8 coefficients
(Combined IIR1 and IIR2 filter responses)
Coefficient set 0,0: high-pass, corner 0.20% f
s
(4 Hz at 2000 SPS)
Coefficient set 1,1: high-pass, corner 0.41% f
s
(4 Hz at 1000 SPS)
Coefficient set 2,2: high-pass, corner 0.82% f
s
(4 Hz at 500 SPS)
Coefficient set 3,3: high-pass, corner 1.22% f
s
(4 Hz at 333 SPS)
Coefficient set 4,4: high-pass, corner 1.63% f
s
(4 Hz at 250 SPS)
Figure 31. IIR Filter Stages
IIR filters
IIR1 Coeff
Selection
IIR1
Corner
Frequency
IIR2 Coeff
Selection
IIR2
Corner
Frequency
IIR3 Coeff
Selection
IIR3
Corner
Frequency
0 0.15%
f
s
0 0.15%
f
s
0,0
0.2041%
f
s
1 0.30%
f
s
1 0.30%
f
s
1,1
0.4074%
f
s
2 0.60%
f
s
2 0.60%
f
s
2,2
0.8152%
f
s
3 0.90%
f
s
3 0.90%
f
s
3,3
1.2222%
f
s
4 1.20%
f
s
4 1.20%
f
s
4,4
1.6293%
f
s
Table 16. IIR Filter Characteristics