cs5378 Cirrus Logic, Inc., cs5378 Datasheet - Page 41

• Manufacturer Part Number: cs5378
• Description: Low-power Single-channel Decimation Filter
• Manufacturer: Cirrus Logic, Inc.

DS639F1
SINC filters
FIR2
Output
Word
Rate
4000
2000
1000
500
333
250
200
125
100
50
40
25
20
10
5
1
SINC1 – Single stage, fixed decimate by 8
SINC2 – Multi-stage, variable decimation
SINC3 – Multi-stage, variable decimation
5
Stage 1: 4
Stage 2: 4
Stage 3: 5
Stage 4: 6
Stage 1: 4
Stage 2: 4
Stage 3: 4
Stage 4: 5
Stage 5: 5
Stage 6: 6
Stage 7: 6
DEC Bit
Setting
th
0111
0110
0101
0100
0011
0010
0001
0000
1111
1110
1101
1100
1011
1010
1001
1000
order decimate by 8, 36 coefficients
th
th
th
th
th
th
th
th
th
th
th
SINC1
Deci-
mation
order decimate by 2, 5 coefficients
order decimate by 2, 5 coefficients
order decimate by 2, 6 coefficients
order decimate by 2, 7 coefficients
order decimate by 5, 17 coefficients
order decimate by 5, 17 coefficients
order decimate by 5, 17 coefficients
order decimate by 5, 21 coefficients
order decimate by 2,
order decimate by 3, 13 coefficients
order decimate by 2,
Figure 24. SINC Filter Stages
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Table 11. SINC Filter Configurations
SINC2
Deci-
mation
16
16
16
16
16
16
2
4
8
8
4
4
8
4
4
8
SINC2
Stages
1,2,3,4
1,2,3,4
1,2,3,4
1,2,3,4
1,2,3,4
1,2,3,4
2,3,4
2,3,4
2,3,4
2,3,4
3,4
3,4
3,4
3,4
3,4
6 coefficients
7 coefficients
4
SINC3
Deci-
mation
100
100
100
500
10
20
20
50
20
-
-
-
-
3
2
4
SINC3
Stages
1,2,3,5,7
2,3,5,7
2,3,5,7
2,3,5,7
3,5,7
3,5,7
3,4,7
3,5,7
4,7
5,7
-
-
-
-
6
7
CS5378
41