Datasheet

Data Sheet AD7626
Rev. B | Page 11 of 28
0
–20
–40
–60
SECOND
HARMONIC
THIRD
HARMONIC
–80
–100
–120
–140
–160
–180
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
AMPLITUDE (dB)
FREQUENCY (MHz)
INPUT FREQUENCY = 5.00656128MHz
–0.5dB INPUT AMPLITUDE
SNR = 86.7dBFS
SINAD = 83.2dBFS
THD = –85.3dB
SFDR = 86.1dB
64k SAMPLES
07648-406
FOURTH
HARMONIC
FIFTH
HARMONIC
Figure 11. FFT, 5 MHz, −0.5 dB Input Tone, Wide View
0
–20
–40
–60
FUNDAMENTAL
–80
–100
–120
–140
–160
–180
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
AMPLITUDE (dB)
FREQUENCY (MHz)
INPUT FREQUENCY = 5.00656128MHz
–6dB INPUT AMPLITUDE
SNR = 88.4dBFS
SINAD = 88.0dBFS
THD = –92.4dB
SFDR = 92.8dB
64k SAMPLES
07648-413
THIRD
HARMONIC
FIFTH
HARMONIC
SECOND
HARMONIC
FOURTH
HARMONIC
Figure 12. FFT, 5 MHz, −6 dB Input Tone, Wide View
–75
–80
–85
–90
–95
–100
–105
–110
–115
–18 0–15 –12 –9 –6 –3
THD (dB)
INPUT AMPLITUDE (dBFS)
07648-211
1MHz
2MHz
3MHz
5MHz
9.7MHz
Figure 13. THD vs. Input Amplitudes at Input Frequency Tones of
10 kHz to 9.7 MHz
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
4.50 4.55 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00
AMPLITUDE (dB)
FREQUENCY (MHz)
INPUT FREQUENCY = 5.00656128MHz
–0.5dB INPUT AMPLITUDE
SNR = 86.7dBFS
SINAD = 83.2dBFS
THD = –85.3dB
SFDR = 86.1dB
64k SAMPLES
07648-412
FUNDAMENTAL
THIRD
HARMONIC
FIFTH
HARMONIC
Figure 14. FFT, 5 MHz, −0.5 dB Input Tone Zoomed View
0
–20
–40
–60
FUNDAMENTAL
–80
–100
–120
–140
–160
–180
4.50 4.55 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00
AMPLITUDE (dB)
FREQUENCY (MHz)
INPUT FREQUENCY = 5.00656128MHz
–6dB INPUT AMPLITUDE
SNR = 88.4dBFS
SINAD = 88.0dBFS
THD = –92.4dB
SFDR = 92.8dB
64k SAMPLES
07648-407
THIRD
HARMONIC
FIFTH HARMONIC
Figure 15. FFT, 5 MHz, −0.5 dB Input Tone Zoomed View
SNR
THD
–50
–60
–70
–80
–90
–100
–110
10k 10M100k 1M
THD (dB)
INPUT FREQUENCY (Hz)
07648-401
94
92
90
88
86
84
82
80
SNR (dBFS)
Figure 16. THD and SNR vs. Input Frequency (−0.5 dB Input Tone)