Datasheet

AD7667
Rev. 0 | Page 13 of 28
03035-0-011
1
344
14654
0
308
113049
15970
116794
0
20000
40000
60000
80000
100000
120000
140000
COUNTS
7FFE 7FFF 8000 8001 8002 8003 8004 8005
CODE IN HEX
Figure 11. Histogram of 261,120 Conversions of a
DC Input at the Code Transition
03035-0-012
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
AMPLITUDE (dB of Full Scale)
0 100 200 300 400 500
FREQUENCY (kHz)
f
S
= 1MSPS
f
IN
= 101.11kHz
SNR = 88.9dB
THD = –94.2dB
SFDR = 94.7dB
S/[N+D] = 88dB
Figure 12. FFT Plot
03035-0-013
SNR
S/[N+D]
ENOB
81
82
83
84
85
86
87
88
89
90
91
SNR, S/[N+D] (dB)
1 10 100 1000
FREQUENCY (kHz)
13.0
13.5
14.0
14.5
15.0
15.5
ENOB (Bits)
Figure 13. SNR, S/(N+D), and ENOB vs. Frequency
03035-0-014
0
35
2602
2958
16 0
51940
56646
146923
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
COUNTS
7FFE 7FFF 8000 8001 8002 8003 8004 8005 8006
CODE IN HEX
Figure 14. Histogram of 261,120 Conversions of a
DC Input at the Code Center
03035-0-015
SFDR
THD
SECOND
HARMONIC
THIRD
HARMONIC
–120
–115
–110
–105
–100
–95
–90
–85
–80
–75
–70
THD, HARMONICS (dB)
1 10 100 1000
FREQUENCY (kHz)
20
30
40
50
60
70
80
90
100
110
120
SFDR (dB)
Figure 15. THD, Harmonics, and SFDR vs. Frequency
03035-0-016
88
89
90
91
–60
–50 –40 –30 –20 –10 0
INPUT LEVEL (dB)
SNR, S/[N+D] REFERRED TO FULL-SCALE (dB)
SNR
S/[N+D]
Figure 16. SNR and S/[N+D] vs. Input Level (Referred to Full Scale)