Datasheet

AD7621
Rev. 0 | Page 13 of 32
04565-011
FREQUENCY (kHz)
AMPLITUDE (dB of Full-Scale)
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
f
S
= 3MSPS
f
IN
= 20.1kHz
SNR = 90.1dB
THD = –103.2dB
SFDR = 103.8dB
SINAD = 89.9dB
Figure 11. FFT 20 kHz
04565-012
FREQUENCY (kHz)
SNR, SINAD (dB)
ENOB (Bits)
75
77
79
81
83
85
87
89
91
93
95
12.0
12.4
12.8
13.2
13.6
14.0
14.4
14.8
15.2
15.6
16.0
1 10 100 1000
SNR
ENOB
SINAD
Figure 12. SNR, SINAD and ENOB vs. Frequency
04565-013
FREQUENCY (kHz)
THD, HARMONICS (dB)
SFDR (dB)
–120
–115
–110
–105
–100
–95
–90
–85
–80
–75
–70
20
30
40
50
60
70
80
90
100
110
120
1 10 100 1000
THD
SFDR
THIRD
HARMONIC
SECOND
HARMONIC
Figure 13. THD, Harmonics, and SFDR vs. Frequency
04565-014
FREQUENCY (kHz)
AMPLITUDE (dB of Full-Scale)
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
f
S
= 3MSPS
f
IN
= 98.79kHz
SNR = 89.9dB
THD = –104.9dB
SFDR = 106.6dB
SINAD = 89.8dB
Figure 14. FFT 100 kHz
04565-015
TEMPERATURE ( ° C)
SNR, SINAD (dB)
ENOB (Bits)
84
92
91
90
89
88
87
86
85
14.0
16.0
15.5
15.0
14.5
–55 –35 –15 125105856545255
SNR
SINAD
ENOB
Figure 15. SNR, SINAD, and ENOB vs. Temperature
04565-016
TEMPERATURE ( ° C)
THD, HARMONICS (dB)
SFDR (dB)
–130
–80
–85
–90
–95
–100
–105
–110
–115
–120
–125
60
110
105
100
95
90
85
80
75
70
65
–55 –35 –15 125105856545255
THIRD HARMONIC
SECOND HARMONIC
SFDR
THD
Figure 16. THD, Harmonics, and SFDR vs. Temperature