CS5012A, CS5014, CS5016
0.0
-20.0
0.0
-20.0
-40.0
-60.0
-80.0
-100.0
-120.0
Sampling Rate: 100kHz
Full Scale: 9Vp-p
S/N+D: 73.6dB
S/N+D: 73.9 dB
-40.0
Signal
Signal
Amplitude
Relative to
Full Scale
(dB)
Amplitude
Relative to
Full Scale
(dB)
-60.0
-80.0
-100.0
-120.0
dc
f /2
s
dc 1.0
50.0
Input Frequency
Input Frequency (kHz)
Figure 18. Plot of Ideal 12-bit ADC
Figure 19. Plot of CS5012A with 1 kHz
Full Scale Input
0.0
-20.0
ures 21 and 23 show FFT plots computed from
an ideal 14 and 16-bit sinewave multiplied by a
Blackman-Harris window. Artifacts of window-
ing are discarded from the signal-to-noise
calculation using the assumption that quantization
noise is white. All FFT plots in this data sheet
were derived by averaging the FFT results from
ten 1024 point time records. This filters the spec-
tral variability that can arise from capturing finite
time records without disturbing the total energy
outside the fundamental. All harmonics which ex-
ist above the noise floor and the -92 dB
side-lobes from the Blackman-Harris window are
therefore clearly visible in the plots. For more in-
formation on FFT’s and windowing refer to: F.J.
HARRIS, "On the use of windows for harmonic
Sampling Rate: 100kHz
Full Scale: 9Vp-p
S/N+D: 72.9dB
-40.0
Signal
Amplitude
Relative to
Full Scale
(dB)
-60.0
-80.0
-100.0
-120.0
12.0
dc
50.0
Input Frequency (kHz)
Figure 20. FFT Plot of CS5012A with 12 kHz
Full-Scale Input
0dB
0dB
Sampling Rate: 56 kHz
S/(N+D): 86.1 dB
Full Scale: 9V p-p
-20dB
-20dB
S/(N+D): 85.3 dB
-40dB
-40dB
-60dB
-60dB
Signal
Signal
Amplitude
Relative to
Full Scale
Amplitude
Relative to
Full Scale
-80dB
-80dB
-100dB
-120dB
-100dB
-120dB
1 kHz
28 kHz
f /2
s
dc
dc
Input Frequency
Input Frequency
Figure 22. CS5014 FFT plot with 1 kHz
Full Scale Input
Figure 21. Plot of Ideal 14-bit ADC
2-32
DS14F6
CIRRUS [ CIRRUS LOGIC ]
