Figure 24. sinc filter stages, Table 11. sinc filter configurations, Cs5378 – Cirrus Logic CS5378 User Manual
Page 41
CS5378
DS639F3
41
Figure 24. SINC Filter Stages
SINC1 – Single stage, fixed decimate by 8
5
th
order decimate by 8, 36 coefficients
SINC2 – Multi-stage, variable decimation
Stage 1: 4
th
order decimate by 2, 5 coefficients
Stage 2: 4
th
order decimate by 2, 5 coefficients
Stage 3: 5
th
order decimate by 2, 6 coefficients
Stage 4: 6
th
order decimate by 2, 7 coefficients
SINC3 – Multi-stage, variable decimation
Stage 1: 4
th
order decimate by 5, 17 coefficients
Stage 2: 4
th
order decimate by 5, 17 coefficients
Stage 3: 4
th
order decimate by 5, 17 coefficients
Stage 4: 5
th
order decimate by 5, 21 coefficients
Stage 5: 5
th
order decimate by 2, 6 coefficients
Stage 6: 6
th
order decimate by 3, 13 coefficients
Stage 7: 6
th
order decimate by 2, 7 coefficients
Table 11. SINC Filter Configurations
SINC filters
FIR2
Output
Word
Rate
DEC Bit
Setting
SINC1
Deci-
mation
SINC2
Deci-
mation
SINC2
Stages
SINC3
Deci-
mation
SINC3
Stages
4000
0111
8 2 4 - -
2000
0110
8 4 3,4 -
-
1000
0101 8
8 2,3,4 -
-
500 0100 8
16
1,2,3,4 -
-
333
0011 8
8 2,3,4 3
6
250 0010 8
16
1,2,3,4 2
7
200 0001 8
4
3,4 10
4,7
125 0000 8
16
1,2,3,4 4
5,7
100 1111 8
4
3,4 20 3,5,7
50 1110 8
8 2,3,4 20 3,5,7
40 1101 8
4 3,4 50 3,4,7
25 1100
8
16 1,2,3,4 20
3,5,7
20 1011 8
4 3,4 100
2,3,5,7
10 1010 8
8 2,3,4
100
2,3,5,7
5 1001 8
16
1,2,3,4
100
2,3,5,7
1 1000 8
16
1,2,3,4
500
1,2,3,5,7