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CS5509 View Datasheet(PDF) - Cirrus Logic

Part Name
Description
MFG CO.
'CS5509' PDF : 30 Pages View PDF
CS5509
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 6. Filter Magnitude Plot to 260 Hz
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 8. Filter Phase Plot to 50 Hz
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 7. Filter Magnitude Plot to 50 Hz
line frequency interference will occur with the
CS5509 running at 32.768kHz.
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
(Hz)
50 ±1%
60 ±1%
100 ±1%
120 ±1%
150 ±1%
180 ±1%
200 ±1%
240 ±1%
Minimum
Attenuation
(dB)
55.5
58.4
62.2
68.4
74.9
87.9
94.0
104.4
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
14
DS125F2
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