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CS5014-KL14 データシート(PDF) 27 Page - Cirrus Logic

部品番号 CS5014-KL14
部品情報  16, 14 & 12-Bit, Self-Calibrating A/D Converters
PDF  46 Pages
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メーカー  CIRRUS [Cirrus Logic]
ホームページ  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5014-KL14 データシート(HTML) 27 Page - Cirrus Logic

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analysis with the Discrete Fourier Transform",
Proc. IEEE, Vol. 66, No. 1, Jan 1978, pp.51-83.
This is available on request from Crystal Semi-
conductor.
Figures 19, 22, and 24 show the performance of
the CS5012A/14/16 with 1kHz full scale inputs.
Figure 20 shows CS5012A performance with
12kHz full scale inputs. Notice that the perform-
ance CS5012A/14/16 closely approaches that of
the corresponding ideal ADC.
CS5012A High Frequency Performance
The CS5012A performs very well over a wide
range of input frequencies as shown in Figure 25.
The figure depicts the CS5012A-KP7 tested un-
der four different conditions. The conditions
include tests with the voltage reference set at 4.5
and at 2.5 volts with input signals at 0.5 dB down
from full scale and 6.0 dB down from full scale.
The sample rate is at 100 kHz for all cases. The
plots indicate that the part performs very well
even with input frequencies above the Nyquist
rate. Best performance at the higher frequencies
is achieved with a 2.5 volt reference.
0
20
40
60
80
100
120
140
160
180
200
55
60
65
70
75
Signal to
Noise +
Distortion
Input Frequency (kHz)
/2
f s
fs
CS5012A-KP7
fs=100 kHz
2
1
3
4
4.5
2.5
4.5
2.5
FS-0.5dB
FS-0.5dB
FS-6.0dB
FS-6.0dB
1.
2.
3.
4.
VREF
Signal
(dB)
Figure 25. CS5012A High Frequency Input Performance
Signal
Amplitude
Relative to
Full Scale
dc
Input Frequency
S/(N+D): 97.5 dB
0dB
-20dB
-40dB
-60dB
-80dB
-100dB
-120dB
f /2
s
Figure 23. Plot of Ideal 16-bit ADC
Signal
Amplitude
Relative to
Full Scale
dc
Input Frequency
0dB
-20dB
-40dB
-60dB
-80dB
-100dB
-120dB
25 kHz
Sampling Rate: 50 kHz
Full Scale: 9V p-p
S/(N+D): 92.4 dB
1 kHz
Figure 24. CS5016 FFT plot with 1 kHz
Full Scale Input
CS5012A, CS5014, CS5016
DS14F6
2-33



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