Table 15. sinc + fir group delay, Cs5378 – Cirrus Logic CS5378 User Manual
Page 47
CS5378
DS639F3
47
Table 15. SINC + FIR Group Delay
Individual filter stage group delay (no IIR)
Decimation
Ratios
Number of
Coefficients
Group Delay
(Input Rate)
SINC1
8 36
17.5
SINC2
Stage 4
2
7
3.0
Stages
3,4
2,2 6,7 8.5
Stages 2,3,4
2,2,2
5,6,7
19.0
Stages 1,2,3,4
2,2,2,2
5,5,6,7
40.0
SINC3
Stage 7
2
7
3.0
Stage 6
3
13
6.0
Stages
5,7
2,2 6,7 8.5
Stages 4,7
5,2
21,7
25.0
Stages 3,5,7
5,2,2
17,6,7
50.5
Stages
3,4,7
5,5,2 17,21,7 133.0
Stages 2,3,5,7
5,5,2,2
17,17,6,7
260.5
Stages 1,2,3,5,7
5,5,5,2,2
17,17,17,6,7
1310.5
FIR1
Coefficient Set 0
4
48
23.5
Coefficient Set 1
4
48
See Figure
FIR2
Coefficient Set 0
2
126
62.5
Coefficient Set 1
2
126
See Figure
Cumulative linear phase group delay (no IIR)
FIR2
Output
Word
Rate
SINC Output
Group Delay
(SINC Filter
Input Rate)
FIR1 Output
Group Delay
(SINC Filter
Input Rate)
FIR2 Output
Group Delay
(SINC Filter
Input Rate)
FIR2 Output
Group Delay
(FIR2 Output
Word Rate)
4000 41.5
417.5
4417.5
34.5117
2000 85.5
837.5
8837.5
34.5215
1000 169.5
1673.5
17673.5
34.5186
500 337.5
3345.5
35345.5 34.5171
333 553.5
5065.5
53065.5 34.5479
250 721.5
6737.5
70737.5 34.5398
200 885.5
8405.5
88405.5 34.5334
125 1425.5
13457.5 141457.5 34.5355
100 1701.5
16741.5 176741.5 34.5198
50 3401.5
33481.5 353481.5 34.5197
40 4341.5
41941.5 441941.5 34.5267
25 6801.5
66961.5 706961.5 34.5196
20 8421.5
83621.5 883621.5 34.5165
10 16841.5 167241.5 1767241.5 34.5164
5 33681.5 334481.5 3534481.5 34.5164
1 168081.5 1672081.5
17672081.5 34.5158