CS5504 データシートの表示（PDF） - Cirrus Logic
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CS5504 Datasheet PDF : 24 Pages
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CS5504
CS5504
0
-20
X1 = 32.768kHz
X2 = 330.00kHz
-40
-60
-80
-100
-120
-140
-160
X1 0
X2 0
XIN = 32.768 kHz
40 80 120 160 200 240
402.83 805.66 1208.5 1611.3 2014.2 2416.9
Frequency (Hz)
Figure 5. Filter Magnitude Plot to 260 Hz
Frequency
(Hz)
50
60
100
120
150
180
200
240
Notch
Depth
(dB)
125.6
126.7
145.7
136.0
118.4
132.9
102.5
108.4
Frequency Minimum
Attenuation
(Hz)
(dB)
50±1%
55.5
60±1%
58.4
100±1%
62.2
120±1%
68.4
150±1%
74.9
180±1%
87.9
200±1%
94.0
240±1%
104.4
Table 3. Filter Notch Attenuation (XIN = 32.768 kHz)
0
-20
-40
-60
-80
-100
-120
Flatness
Frequency dB
1
-0.010
2
-0.041
3
-0.093
4
-0.166
5
-0.259
6
-0.374
7
-0.510
8
-0.667
9
-0.846
10 -1.047
17 -3.093
XIN = 32.768 kHz
-140
0
5 10 15 20 25 30 35 40 45 50
Frequency (Hz)
Figure 6. Filter Magnitude Plot to 50 Hz
32.768 kHz. Figures 5, 6 and 7 illustrate the
magnitude and phase characteristics of the filter.
Figure 5 illustrates the filter attenuation from dc
to 260 Hz. At exactly 50, 60, 100, and 120 Hz
the filter provides over 120 dB of rejection. Ta-
ble 3 indicates the filter attenuation for each of
the potential line interference frequencies when
the converter is operating with a 32.768 kHz
clock. The converter yields excellent attenuation
180
135
90
45
0
-45
-90
-135
XIN = 32.768 kHz
-180
0
5 10 15 20 25 30 35 40 45 50
Frequency (Hz)
Figure 7. Filter Phase Plot to 50 Hz
of these interference frequencies even if the fun-
damental line frequency should vary ± 1% from
its specified frequency. The -3dB corner fre-
quency of the filter when operating from a
32.768 kHz clock is 17 Hz. Figure 7 illustrates
that the phase characteristics of the filter are pre-
cisely linear phase.
14
DS126F21
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