Datasheet

AD7678
Rev. A | Page 13 of 28
FREQUENCY (kHz)
–80
0
THD, HARMONICS (dB)
–90
–120
–150
–140
–100
10 40 50
03084-0-016
–110
–130
THD
THIRD
HARMONIC
SECOND
HARMONIC
20 30
Figure 11. THD and Harmonics vs. Frequency
INPUT LEVEL (dB)
–60
SNR REFERRED TO FULL SCALE (dB)
101
98
100
03084-0-017
99
SNR
–50 0–10–20–30–40
104
102
103
V
REF
= 4.096V
S/(N+D)
Figure 12. SNR and S/(N+D) vs. Input Level
–55
SNR, S/[N+D] (dB)
99
97
03084-0-018
100
98
–35 12585655–15
101
SNR
ENOB
14.5
15.0
15.5
16.5
16.0
S/(N+D)
25 45 105
TEMPERATURE (C)
Figure 13. SNR, S/(N+D), and ENOB vs. Temperature
TEMPERATURE (C)
–55
THD, HARMONICS (dB)
–120
–140
03084-0-019
–110
–130
–35 12585655–15
–100
25 45 105
THIRD
HARMONIC
SECOND
HARMONIC
THD
Figure 14. THD and Harmonics vs. Temperature
SAMPLING RATE (SPS)
10000
OPERATING CURRENT (

A)
0.001
1000
100
0.1
0.01
100k10k1k1001
10
AVDD
03084-0-020
DVDD
OVDD
10
1
Figure 15. Operating Current vs. Sampling Rate
TEMPERATURE (  C)
1000
–55
POWER-DOWN OPERATING CURRENTS (nA)
800
0
400
200
600
125
DVDD
–35–155 25456585105
AVDD
OVDD
03084-0-021
Figure 16. Power-Down Operating Currents vs. Temperature