Datasheet

AD7643
Rev. 0 | Page 13 of 28
FREQUENCY (kHz)
AMPLITUDE (dB of Full Scale)
0
–180
06
00
0
–180
0600
FREQUENCY (kHz)
AMPLITUDE (dB of Full Scale)
06024-011
–20
–40
–60
–80
–100
–120
–140
–160
100 200 300 400 500
f
S
= 1.25MSPS
f
IN
= 20.03kHz
SNR = 93.4dB
THD = –113dB
SFDR = 108dB
SINAD = 93.4dB
06024-014
–20
–40
–60
–80
–100
–120
–140
–160
100 200 300 400 500
f
S
= 1.25MSPS
f
IN
= 100.03kHz
SNR = 93dB
THD = –106dB
SFDR = 109dB
SINAD = 92.8dB
Figure 11. FFT 20 kHz
95
75
1 1000
FREQUENCY (kHz)
SNR, SINAD (dB)
SINAD
ENOB
SNR
06024-012
93
91
89
87
85
83
81
79
77
16.0
12.0
ENOB (Bits)
15.6
15.2
14.8
14.4
14.0
13.6
13.2
12.8
12.4
10 100
Figure 12. SNR, SINAD, and ENOB vs. Frequency
–
70
–140
1 1000
FREQUENCY (kHz)
THD, HARMONICS (dB)
SFDR
THD
06024-013
120
20
SFDR (dB)
110
100
90
80
70
60
50
40
30
10 100
–80
–90
–100
–110
–120
–130
THIRD HARMONIC
SECOND HARMONIC
Figure 13. THD, Harmonics, and SFDR vs. Frequency
Figure 14. FFT 100 kHz
95
94
93
92
91
90
19
18
17
16
15
14
–55 125105
SNR
856545255–15–35
TEMPERATURE (°C)
SNR, SINAD (dB)
ENOB (Bits)
06024-015
ENOB
SINAD
Figure 15. SNR, SINAD, and ENOB vs. Temperature
–
85
–90
–95
–100
–105
–110
–115
–120
–125
–130
–135
–140
–145
120
60
70
80
90
100
110
–55 125105856545255–15–35
TEMPERATURE (°C)
THD, HARMONICS (dB)
SFDR (dB)
06024-016
SFDR
THD
SECOND
HARMONIC
THIRD
HARMONIC
Figure 16. THD, Harmonics, and SFDR vs. Temperature