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Application Note 9783
Measured Performance
The performance of the evaluation board was measured by
TABLE 3. DYNAMIC PERFORMANCE
capturing the ADC data and performing the Fast Fourier
Transform (FFT) to derive Signal-to-Noise and Distortion
Ratio (SINAD), Signal-to-Noise Ratio (SNR), Total Harmonic
Distortion (THD) and Effective Number of Bits (ENOB). This
data is summarized in Table 3 and graphically displayed in
Figures 1 and 2.
Note: Coherent testing is recommended in order to avoid the
f IN (MHz)
0.1
1
5
10
ENOB
7.63
7.51
7.32
7.01
SINAD dB
47.71
49.96
45.81
43.97
SNR dB
48.41
48.14
46.51
46.90
THD dB
-54.91
-53.19
-54.1
-47.06
inaccuracies of windowing.
15
20
6.54
6.18
41.13
38.96
46.9
47
-42.46
-39.65
60
8
40
7
20
0
-20
-40
SINAD dB
SNR dB
THD dB
6
5
4
3
2
1
ENOB
-60
0.1
1
5
10
15
20
0
0.1
1
5
10
15
20
INPUT FREQUENCY (MHz
FIGURE 2. SINAD, SNR AND THD vs f IN
4
INPUT FREQUENCY (MHz)
FIGURE 3. ENOB vs f IN (f CLOCK = 50MHz
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