Datasheet

AD7767
Rev. C | Page 11 of 24
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0 8k 16k 24k 32k 40k 48k 56k 64k
AMPLITUDE (dB)
FREQUENCY (Hz)
06859-107
Figure 13. AD7767 FFT, 1 kHz, −60 dB Input Tone
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0 4k 8k 12k 16k 20k 24k 28k 32k
AMPLITUDE (dB)
FREQUENCY (Hz)
06859-108
Figure 14. AD7767-1 FFT, 1 kHz, −60 dB Input Tone
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
016k12k8k4k
AMPLITUDE (dB)
FREQUENCY (Hz)
06859-109
Figure 15. AD7767-2 FFT, 1 kHz, −60 dB Input Tone
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0 8k 16k 24k 32k 40k 48k 56k 64k
AMPLITUDE (dB)
FREQUENCY (Hz)
TONE A = 49.7kHz
TONE B = 50.3kHz
SECOND-ORDER IMD = –133.71dB
THIRD-ORDER IMD = –109.05dB
06859-110
Figure 16. AD7767 IMD FFT, 50 kHz Center Frequency
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0 4k 8k 12k 16k 20k 24k 28k 32k
AMPLITUDE (dB)
FREQUENCY (Hz)
TONE A = 24.7kHz
TONE B = 25.3kHz
SECOND-ORDER IMD = –133.33dB
THIRD-ORDER IMD = –108.15dB
06859-111
Figure 17. AD7767-1 IMD FFT, 25 kHz Center Frequency
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0112k8k4k
AMPLITUDE (dB)
FREQUENCY (Hz)
6k
TONE A = 11.7kHz
TONE B = 12.3kHz
SECOND-ORDER IMD = –137.96dB
THIRD-ORDER IMD = –108.1dB
06859-112
Figure 18. AD7767-2 IMD FFT, 12 kHz Center Frequency