AD9268
0
120
100
80
125MSPS
SFDR (dBFS)
70.1MHz @ –6dBFS
SNR = 72.2dB (78.2dBFS)
SFDR = 97dBc
–20
–40
–60
–80
SNR (dBFS)
60
SFDR (dBc)
SECOND HARMONIC
THIRD HARMONIC
40
20
0
–100
–120
–140
SNR (dBc)
0
10
20
30
40
50
60
–100 –90 –80 –70 –60 –50 –40 –30 –20 –10
0
FREQUENCY (MHz)
INPUT AMPLITUDE (dBFS)
Figure 41. AD9268-125 Single-Tone SNR/SFDR vs. Input Amplitude (AIN
)
Figure 38. AD9268-125 Single-Tone FFT with fIN = 70.1 MHz @ −6 dBFS
with Dither Enabled
with fIN = 2.4 MHz
120
0
SFDR (dBFS)
125MSPS
–15 70.1MHz @ –23dBFS
SNR = 56.8dB (79.8dBFS)
100
SFDR = 67.7dBc
–30
–45
–60
SNR (dBFS)
80
THIRD HARMONIC
60
–75
–90
SECOND HARMONIC
SFDR (dBc)
40
–105
–120
–135
–150
SNR (dBc)
20
0
–100 –90 –80 –70 –60 –50 –40 –30 –20 –10
0
0
6
12
18
24
30
36
42
48
54
60
INPUT AMPLITUDE (dBFS)
FREQUENCY (MHz)
Figure 42. AD9268-125 Single-Tone SNR/SFDR vs. Input Amplitude (AIN
)
Figure 39. AD9268-125 Single-Tone FFT with fIN = 70.1 MHz @ −23 dBFS
with Dither Disabled, 1M Sample
with fIN = 98.12 MHz
120
0
125MSPS
–15 70.1MHz @ –23dBFS
SNR = 56.2dB (57.2dBFS)
SFDR (DITHER ON)
110
SFDR = 86.6dBc
–30
–45
–60
100
–75
–90
SECOND HARMONIC
THIRD HARMONIC
SFDR (DITHER OFF)
90
–105
–120
–135
–150
SNR (DITHER OFF)
80
SNR (DITHER ON)
70
–100 –90 –80 –70 –60 –50 –40 –30 –20 –10
0
0
6
12
18
24
30
36
42
48
54
60
INPUT AMPLITUDE (dBFS)
FREQUENCY (MHz)
Figure 43. AD9268-125 Single Tone SNR/SFDR vs. Input Amplitude (AIN)
with fIN = 30 MHz with and without Dither Enabled
Figure 40. AD9268-125 Single-Tone FFT with fIN = 70.1 MHz @ −23 dBFS
with Dither Enabled, 1M Sample
Rev. A | Page 22 of 44
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