Cirrus Logic CS5378 - Manual (Page 42)

CS5378
DS639F3 42
Filter Type
System Function Filter Coefficients
SINC2 (Stage 1)
SINC2 (Stage 2)
4
th order decimate by 2
5 coefficients
4
1
2
1
1
) ( 





−
−
=
−
−
z
z
z H
h
0
= 1
h
1
= 4
h
2
= 6
h
3
= 4
h
4
= 1
SINC2 (Stage 3)
5
th order decimate by 2
6 coefficients
5
1
2
1
1
) ( 





−
−
=
−
−
z
z
z H
h
0
= 1
h
1
= 5
h
2
= 10
h
3
= 10
h
4
= 5
h
5
= 1
SINC2 (Stage 4)
6
th order decimate by 2
7 coefficients
6
1
2
1
1
) ( 





−
−
=
−
−
z
z
z H
h
0
= 1
h
1
= 6
h
2
= 15
h
3
= 20
h
4
= 15
h
5
= 6
h
6
= 1
Filter Type
System Function Filter Coefficients
SINC1
5
th order decimate by 8
36 coefficients
5
1
8
1
1
) ( 





−
−
=
−
−
z
z
z H
h
0
= 1 h
18
= 2460
h
1
= 5 h
19
= 2380
h
2
= 15 h
20
= 2226
h
3
= 35 h
21
= 2010
h
4
= 70 h
22
= 1750
h
5
= 126 h
23
= 1470
h
6
= 210 h
24
= 1190
h
7
= 330 h
25
= 926
h
8
= 490 h
26
= 690
h
9
= 690 h
27
= 490
h
10
= 926 h
28
= 330
h
11
= 1190 h
29
= 210
h
12
= 1470 h
30
= 126
h
13
= 1750 h
31
= 70
h
14
= 2010 h
32
= 35
h
15
= 2226 h
33
= 15
h
16
= 2380 h
34
= 5
h
17
= 2460 h
35
= 1
Table 12. SINC1 and SINC2 Filter Coefficients