CS5378 데이터 시트보기 (PDF) - Cirrus Logic
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CS5378 Datasheet PDF : 88 Pages
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CS5378
FIR1 – Single stage, fixed decimate by 4
Coefficient set 0: linear phase decimate by 4, 48 coefficients
Coefficient set 1: minimum phase decimate by 4, 48 coefficients
SINC droop compensation filter
FIR2 – Single stage, fixed decimate by 2
Coefficient set 0: linear phase decimate by 2, 126 coefficients
Coefficient set 1: minimum phase decimate by 2, 126 coefficients
Brick wall low-pass filter, flat to 40% fs
Combined SINC + FIR digital filter specifications
Passband ripple less than +/- 0.01 dB below 40% fs
Transition band -3 dB frequency at 42.89% fs
Stopband attenuation greater than 130 dB above 50% fs
Figure 26. FIR Filter Stages
SINC + FIR filters
FIR2
SINC
FIR1
Output
Deci-
Deci-
Word
mation
mation
Rate
4000
16
4
2000
32
4
1000
64
4
500
128
4
333
192
4
250
256
4
200
320
4
125
512
4
100
640
4
50
1280
4
40
1600
4
25
2560
4
20
3200
4
10
6400
4
5
12800
4
1
64000
4
FIR2
Deci-
mation
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Total
Deci-
mation
128
256
512
1024
1536
2048
2560
4096
5120
10240
12800
20480
25600
51200
102400
512000
Passband
Ripple
(± dB)
0.0042
0.0045
0.0040
0.0041
0.0080
0.0064
0.0043
0.0046
0.0040
0.0040
0.0040
0.0040
0.0036
0.0036
0.0036
0.0029
Stopband
Atten-
uation
(dB)
130.38
130.38
130.42
130.42
130.45
130.43
130.44
130.42
130.43
130.43
130.44
132.98
130.43
130.43
130.43
134.31
Table 14. FIR Filter Characteristics
DS639F2
46
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