Datasheet

AD7679
Rev. A | Page 14 of 28
–55
SNR, S/[N+D] (dB)
98
96
03085-0-018
99
97
–35 12585655–15
100
SNR
ENOB
14.5
15.0
15.5
16.5
16.0
S/(N+D)
25 45 105
TEMPERATURE (°C)
TEMPERATURE ( ° C)
1000
–55
POWER-DOWN OPERATING CURRENTS (nA)
700
400
200
0
300
100
500
125
DVDD
–35–155 25456585105
AVDD
OVDD
03085-0-021
500
800
900
Figure 17. SNR, S/(N+D), and ENOB vs. Temperature Figure 20. Power-Down Operating Currents vs. Temperature
TEMPERATURE (°C)
–55
ZERO ERROR,POSITIVE AND
NEGATIVE FULL SCALE (LSB)
–15
–25
03085-0-022
–20
–35 12585655–15
25
25 45 105
–5
5
–10
0
10
15
20
POSITIVE
FULL SCALE
NEGATIVE
FULL SCALE
ZERO ERROR
TEMPERATURE (°C)
–55
THD, HARMONICS (dB)
–120
–140
03085-0-019
–110
–130
–35 12585655–15
–100
25 45 105
THIRD
HARMONIC
SECOND
HARMONIC
THD
Figure 18. THD and Harmonics vs. Temperature Figure 21. Zero Error Positive and Negative Full Scale vs. Temperature
SAMPLING RATE (SPS)
100000
OPERATING CURRENTS (μA)
0.001
1M
10000
1000
100
10
1
0.1
0.01
100k10k1k1001
AV D D
10
DVDD
OVDD
PDBUF HIGH
03085-0-020
C
L
(pF)
0
t
12
DELAY (ns)
10
0
03085-0-024
20015050
50
100
30
20
40
OVDD = 2.7V @ 85°C
OVDD = 5V @ 85°C
OVDD = 5V @ 25°C
OVDD = 2.7V @ 25°C
Figure 19. Operating Current vs. Sampling Rate
Figure 22. Typical Delay vs. Load Capacitance C
L