ADS131B04-Q1
ZHCSMK3B –NOVEMBER 2020 –REVISED NOVEMBER 2021
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方程式5 calculates the transfer function of a sinc3 filter in terms of the continuous-time frequency parameter f:
3
Npf
sin
fMOD
H(f)½ =
pf
N ´ sin
fMOD
(5)
where:
• N is the OSR
图 8-5 and 图 8-6 show the digital filter response of the fast-settling filter and the sinc3 filter for OSRs ranging
from 128 to 1024. 图8-7 and 图8-8 compare the digital filter responses of the sinc3 filter at an OSR of 1024 and
sinc3 + sinc1 filter for an OSR of 4096.
0
-20
0
-1.5
-3
-40
-4.5
-6
-60
-80
-7.5
-9
-100
-120
-140
-10.5
-12
Fast-settling filter
Sinc3 filter
Fast-settling filter
Sinc3 filter
0
1
2
Frequency (fIN/fDATA
3
4
5
0
0.1
0.2 0.3
Frequency (fIN/fDATA)
0.4
0.5
)
图8-5. Fast-Settling and Sinc3 Digital Filter
图8-6. Fast-Settling and Sinc3 Digital Filter
Response
Response, Pass-Band Detail
0
0
-2
-4
-6
-8
Sinc3 filter (1024)
Sinc3 + Sinc1 filter
-20
-40
-60
-80
-100
-120
-140
-10
Sinc3 filter (1024)
Sinc3 + Sinc1 filter
-12
0
1
2
3
4
5
6
Frequency (f /fDATA
7
8
)
9
10 11 12
0
0.1
0.2 0.3
Frequency (f /fDATA)
0.4
0.5
IN
IN
图8-7. Digital Filter Response for OSR = 1024 and 图8-8. Digital Filter Response for OSR = 1024 and
OSR = 4096 OSR = 4096, Pass-Band Detail
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