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CS5509-ASZ Arkusz danych(PDF) 14 Page - Cirrus Logic

Numer części CS5509-ASZ
Szczegółowy opis  SINGLE SUPPLY 16BIT A/D CONVERTER
PDF  23 Pages
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Producent  CIRRUS [Cirrus Logic]
Strona internetowa  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5509-ASZ Arkusz danych(HTML) 14 Page - Cirrus Logic

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CS5509
14
DS125F2
line frequency interference will occur with the
CS5509 running at 32.768kHz.
Table 2. Filter Notch Attenuation (XIN = 32.768 kHz)
Anti-Alias Considerations for Spectral
Measurement Applications
Input frequencies greater than one half the output
word rate (CONV = 1) may be aliased by the con-
verter. To prevent this, input signals should be lim-
ited in frequency to no greater than one half the
output word rate of the converter (when CONV
=1). Frequencies close to the modulator sample rate
(XIN/2) and multiples thereof may also be aliased.
If the signal source includes spectral components
above one half the output word rate (when CONV
= 1) these components should be removed by
means of low-pass filtering prior to the A/D input
0
0
40
402.83
80
805.66
120
1208.5
160
1611.3
200
2014.2
240
2416.9
Frequency (Hz)
-160
-140
-120
-100
-80
-60
-40
-20
0
XIN = 32.768 kHz
X1
X2
X1 = 32.768kHz
X2 = 330.00kHz
Figure 6. Filter Magnitude Plot to 260 Hz
0
5
10
15
20
25
30
35
40
45
50
Frequency (Hz)
-140
-120
-100
-80
-60
-40
-20
0
Flatness
dB
-0.010
-0.041
-0.093
-0.166
-0.259
-0.510
-0.667
-0.846
-1.047
-3.093
1
2
3
4
5
6
7
8
9
10
17
XIN = 32.768 kHz
Frequency
-0.374
Figure 7. Filter Magnitude Plot to 50 Hz
Frequency
(Hz)
Notch
Depth
(dB)
Frequency
(Hz)
Minimum
Attenuation
(dB)
50
125.6
50 ±1%
55.5
60
126.7
60 ±1%
58.4
100
145.7
100 ±1%
62.2
120
136.0
120 ±1%
68.4
150
118.4
150 ±1%
74.9
180
132.9
180 ±1%
87.9
200
102.5
200 ±1%
94.0
240
108.4
240 ±1%
104.4
05
10
15
20
25
30
35
40
45
50
Frequency (Hz)
-180
-135
-90
-45
0
45
90
135
180
XIN = 32.768 kHz
Figure 8. Filter Phase Plot to 50 Hz



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