Datasheet

AD7691 Data Sheet
Rev. C | Page 10 of 28
104
86
92
90
88
2.3 5.34.7 5.0
REFERENCE VOLTAGE (V)
SNR, SINAD (dB)
102
100
98
96
94
14
ENOB (Bits)
18
17
16
15
2.6 2.9 3.2 3.5 3.8 4.1 4.4
ENOB
SINAD
06146-032
SNR
Figure 13. SNR, SINAD, and ENOB vs. Reference Voltage
105
100
95
90
85
80
–55 125
TEMPERATURE (°C)
SNR (dB)
–35–155 25456585105
06146-033
V
REF
= 5V
V
REF
= 2.5V
Figure 14. SNR vs. Temperature
105
70
0 125
FREQUENCY (kHz)
SINAD (dB)
100
95
90
85
80
75
25 50 75 100
V
REF
= 5V, –1dB
V
REF
= 2.5V, –10dB
V
REF
= 2.5V, –1dB
V
REF
= 5V, –10dB
06146-037
Figure 15. SINAD vs. Frequency
–
105
–135
–125
–130
2.3 5.3
REFERENCE VOLTAGE (V)
THD, SFDR (dB)
2.6 2.9 3.2 3.5 3.8 4.1 4.4 4.7 5.0
–110
–115
–120
06146-038
THD
SFDR
Figure 16. THD, SFDR vs. Reference Voltage
–
90
–130
–55 125
TEMPERATURE (°C)
THD (dB)
–35–155 25456585105
V
REF
= 5V
V
REF
= 2.5V
–100
–110
–120
06146-039
Figure 17. THD vs. Temperature
–
60
–130
0 125
FREQUENCY (kHz)
THD (dB)
–70
–80
–90
–100
–110
–120
25 50 75 100
V
REF
= 5V, –1dB
V
REF
= 2.5V, –10dB
V
REF
= 2.5V, –1dB
V
REF
= 5V, –10dB
06146-040
Figure 18. THD vs. Frequency