Datasheet

AD7641
Rev. 0 | Page 13 of 28
FREQUENCY (kHz)
AMPLITUDE (dB of Full Scale)
0
–180
01
000
04761-011
–20
–40
–60
–80
–100
–120
–140
–160
100 200 300 400 500 600 700 800 900
f
S
= 2MSPS
f
IN
= 20.1kHz
SNR = 93.6dB
THD = –116dB
SFDR = 112dB
SINAD = 93.5dB
0
–180
01000
FREQUENCY (kHz)
AMPLITUDE (dB of Full Scale)
Figure 11. FFT 20 kHz
95
75
1 1000
FREQUENCY (kHz)
SNR, SINAD (dB)
ENOB (Bits)
04761-012
93
91
89
87
85
83
81
79
77
16.0
12.0
15.6
15.2
14.8
14.4
14.0
13.6
13.2
12.8
12.4
10
ENOB
SINAD
SNR
100
Figure 12. SNR, SINAD, and ENOB vs. Frequency
–
70
–140
1 1000
FREQUENCY (kHz)
THD, HARMONICS (dB)
SFDR (dB)
04761-013
–80
–90
–100
–110
–120
–130
120
20
110
100
90
80
70
60
50
40
30
10 100
SFDR
THD
THIRD
HARMONIC
SECOND
HARMONIC
Figure 13. THD, Harmonics, and SFDR vs. Frequency
04761-014
f
S
= 2MSPS
f
IN
= 100.8kHz
SNR = 93dB
THD = –101dB
SFDR = 101dB
SINAD = 92.5dB
–20
–40
–60
–80
–100
–120
–140
–160
100 200 300 400 500 600 700 800 900
Figure 14. FFT 100 kHz
95
90
–55 125
TEMPERATURE (°C)
SNR, SINAD (dB)
04761-015
94
93
92
91
19
14
ENOB (Bits)
18
17
16
15
–35 –15 5 25 45 65 85 105
SNR
ENOB
SINAD
Figure 15. SNR, SINAD, and ENOB vs. Temperature
–
90
–140
–55 125
TEMPERATURE (°C)
THD, HARMONICS (dB)
04761-016
–95
–100
–105
–110
–115
–120
–125
–130
–135
120
70
SFDR (dB)
115
110
105
100
95
90
85
80
75
–35 –15 5 25 45 65 85 105
SFDR
THD
THIRD
HARMONIC
SECOND
HARMONIC
Figure 16. THD, Harmonics, and SFDR vs. Temperature