Datasheet

Data Sheet AD7682/AD7689
Rev. D | Page 13 of 32
100
95
90
85
80
75
70
65
60
0 50 100 150 200
SNR (dB)
FREQUENCY (kHz)
V
REF
= VDD = 5V, –0.5dB
V
REF
= VDD = 5V, –10dB
V
REF
= VDD = 2.5V, –0.5dB
V
REF
= VDD = 2.5V, –10dB
07353-041
Figure 12. SNR vs. Frequency
96
94
92
90
88
86
84
82
80
17.0
16.5
16.0
15.5
15.0
14.5
14.0
13.5
13.0
1.0
SNR, SINAD (dB)
ENOB (Bits)
REFERENCE VOLTAGE (V)
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
5.5
SNR @ 2kHz
SINAD @ 2kHz
SNR @ 20kHz
SINAD @ 20kHz
ENOB @ 2kHz
ENOB @ 20kHz
07353-013
Figure 13. SNR, SINAD, and ENOB vs. Reference Voltage
96
94
92
90
88
86
84
–55
SNR (dB)
TEMPERATURE (°C)
–35 –15 5 25 45 65 85 105
125
f
IN
= 20kHz
V
REF
= VDD = 5V
V
REF
= VDD = 2.5V
07353-014
Figure 14. SNR vs. Temperature
100
95
90
85
80
75
70
65
60
0 50 100 150 200
SINAD (dB)
FREQUENCY (kHz)
V
REF
= VDD = 5V, –0.5dB
V
REF
= VDD = 5V, –10dB
V
REF
= VDD = 2.5V, –0.5dB
V
REF
= VDD = 2.5V, –10dB
07353-012
Figure 15. SINAD vs. Frequency
130
125
120
115
110
105
100
95
90
85
80
75
70
1.0
SFDR (dB)
–
60
–65
–70
–75
–80
–85
–90
–95
–100
–105
–110
–115
–120
THD (dB)
REFERENCE VOLTAGE (V)
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SFDR = 2kHz
SFDR = 20kHz
THD = 2kHz
THD = 20kHz
07353-016
Figure 16. SFDR and THD vs. Reference Voltage
–
90
–95
–100
–105
–110
–55
THD (dB)
TEMPERATURE (°C)
–35 –15 5 25 45 65 85 105
125
f
IN
= 20kHz
V
REF
= VDD = 5V
V
REF
= VDD = 2.5V
07353-017
Figure 17. THD vs. Temperature