Datasheet

AD7674
Rev. A | Page 13 of 28
POSITIVE DNL (LSB)
120
0
NUMBER OF UNITS
100
60
20
0
40
80
0.5 1.0 1.5
03083-0-011
2.0
Figure 11. Typical Positive DNL Distribution (424 Units)
FREQUENCY (kHz)
0
0 50 100 400
AMPLITUDE (dB of Full Scale)
–40
–60
–100
–180
–80
–120
03083-0-012
–140
–20
–160
150 200 250 300 350
f
S
= 800kSPS
f
IN
= 10kHz
V
REF
= 4.096V
SNR = 98.4dB
THD = 119.1dB
SFDR = 120.4dB
SINAD = 98.4dB
Figure 12. FFT (10 kHz Tone)
FREQUENCY (kHz)
0
0 50 100 400
AMPLITUDE (dB of Full Scale)
–40
–60
–100
–180
–80
–120
03083-0-013
–140
–20
–160
150 200 250 300 350
f
S
= 800kSPS
f
IN
= 100kHz
V
REF
= 4.096V
SNR = 98.8dB
THD = 104.3dB
SFDR = 104.9dB
SINAD = 97.8dB
Figure 13. FFT (100 kHz Tone)
NEGATIVE DNL (LSB)
250
–2.0
NUMBER OF UNITS
200
150
50
0
–1.5 –1.0 –0.5
03083-0-014
100
0
Figure 14. TypicalNegative DNL Distribution (424 Units)
FREQUENCY (kHz)
102
1
SNR AND S/[N+D] (dB)
99
90
78
75
84
96
10 100 1000
03083-0-015
93
81
87
ENOB
S/(N+D)
SNR
16.0
16.5
15.0
15.5
14.0
14.5
13.5
ENOB (Bits)
Figure 15. SNR, S/(N+D), and ENOB vs. Frequency
FREQUENCY (kHz)
–60
1
THD, HARMONICS (dB)
–70
–100
–130
–120
–80
10 100 1000
03083-0-016
–90
–110
THD
THIRD
HARMONIC
SFDR
140
60
20
40
0
SFDR (dB)
120
80
100
SECOND
HARMONIC
Figure 16. THD, SFDR, and Harmonics vs. Frequency