AD7691 Analog Devices, AD7691 Datasheet - Page 10

• Manufacturer Part Number: AD7691
• Manufacturer: Analog Devices

Specifications of AD7691

• Resolution (bits): 18bit
• # Chan: 1
• Sample Rate: 250kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: CSP,SOP

AD7691
104
102
100
98
96
94
92
90
88
86
2.3
105
100
105
100
95
90
85
80
95
90
85
80
75
70
–55
Figure 13. SNR, SINAD, and ENOB vs. Reference Voltage
0
2.6
–35
2.9
25
–15
Figure 14. SNR vs. Temperature
Figure 15. SINAD vs. Frequency
V
3.2
REFERENCE VOLTAGE (V)
REF
V
REF
= 5V, –10dB
3.5
5
TEMPERATURE (°C)
FREQUENCY (kHz)
= 2.5V, –1dB
50
V
V
3.8
25
REF
REF
= 5V
= 2.5V
4.1
45
75
4.4
65
V
REF
4.7
V
REF
85
SNR
ENOB
= 2.5V, –10dB
100
SINAD
= 5V, –1dB
5.0
105
5.3
18
17
16
15
14
125
125
Rev. B | Page 10 of 28
–100
–120
–130
–100
–120
–130
–105
–110
–115
–120
–125
–130
–135
–110
–110
–90
–60
–70
–80
–90
–55
2.3
0
2.6
–35
Figure 16. THD, SFDR vs. Reference Voltage
2.9
25
Figure 17. THD vs. Temperature
–15
Figure 18. THD vs. Frequency
V
V
REF
REF
3.2
REFERENCE VOLTAGE (V)
5
= 2.5V, –1dB
= 5V, –10dB
TEMPERATURE (°C)
FREQUENCY (kHz)
3.5
50
V
25
V
REF
SFDR
REF
THD
3.8
= 2.5V
= 5V
45
4.1
75
65
4.4
V
REF
V
REF
85
= 2.5V, –10dB
4.7
100
= 5V, –1dB
105
5.0
125
125
5.3