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WM8945ECS/R 数据表(PDF) 34 Page - Wolfson Microelectronics plc

部件名 WM8945ECS/R
功能描述  Mono Low-Power CODEC with Video Buffer and Touch Panel Controller
PDF  169 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8945ECS/R 数据表(HTML) 34 Page - Wolfson Microelectronics plc

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WM8945
Production Data
w
PD, May 2011, Rev 4.1
34
5-NOTCH FILTER
The 5-notch filter is part of the SE1 block. This function allows up to 5 programmable frequency
bands to be attenuated. The frequency and width of each notch is configurable; the depth of the
attenuation may also be adjusted. The default setting is bypass (OFF). The notch filters are enabled
using the SE1_NOTCH_L_ENA register bit defined in Table 13. For the derivation of the other
associated registers, refer to the configuration tools supplied with the WM8945 Evaluation Kit.
Typical applications for the notch filters are filtering of fixed-frequency noise or resonances; these
might arise from a motor (e.g. DSC zoom lens motor) or from characteristics of the application
housing. Example plots of the Notch filter response are shown in Figure 15.
Notch Response - Slave Mode - fc=1kHz, fb=1kHz Depth 0 to 100%
-100
+0
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
V
520
1.5k
550 600 650 700 750 800 850 900
1k
1.2k
Hz
Notch Response - Slave Mode - fc=1kHz, fb=100, 500, 1k, 5k, 10kHz -
Depth=100%
-100
+0
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
V
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
T
T
1kHz notch, bandwidth 1kHz, depth 0% to 100% in 20% steps
1kHz notch, 100% depth, bandwidth 100Hz, 500Hz, 1kHz, 5kHz, 10kH
z
Notch Response - Slave Mode - fc=200, 500, 1k, 2k, 5k, 10kHz, fb=fc/2,
Depth 100%
-100
+0
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
V
100
20k
200
500
1k
2k
5k
10k
Hz
T
T
T
T
T
T
T
T
T
T
T
T
T
5 notches, bandwidth Fcentre/2, depth 100%
Figure 15 Notch Filter Responses



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