AD7690 Analog Devices, AD7690 Datasheet - Page 9

• Manufacturer Part Number: AD7690
• Manufacturer: Analog Devices

Specifications of AD7690

• Resolution (bits): 18bit
• # Chan: 1
• Sample Rate: 400kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: CSP,SOP

TYPICAL PERFORMANCE CHARACTERISTICS
–0.5
–1.0
–1.5
–100
–120
–140
–160
–180
1.5
1.0
0.5
80k
70k
60k
50k
40k
30k
20k
10k
–20
–40
–60
–80
0
0
0
0
0
Figure 8. Histogram of a DC Input at the Code Center
55
0
20
57
Figure 7. Integral Nonlinearity vs. Code
0
Figure 9. Fast Fourier Transform Plot
40
65536
39
58
2614
60
59
FREQUENCY (kHz)
31666
80
5A
CODE IN HEX
131072
CODE
67198
100
5B
27546
POSITIVE INL = +0.42LSB
NEGATIVE INL = –0.6LSB
5C
120
1991
5D
140
196608
f
f
SNR = 101.4dB
THD = –122dB
SFDR = 130dB
SINAD = 101.3dB
VDD = REF = 5V
S
IN
5E
18
= 400kSPS
= 1.99kHz
160
5F
0
180
262144
60
0
200
Rev. B | Page 9 of 24
105
104
103
102
101
100
99
98
97
96
95
–0.5
–1.0
1.0
0.5
–10
60k
50k
40k
30k
20k
10k
0
Figure 11. Histogram of a DC Input at the Code Transition
0
0
31
0
Figure 10. Differential Nonlinearity vs. Code
32
0
–8
Figure 12. SNR, THD vs. Input Level
65536
33
2
533
34
INPUT LEVEL (dB)
12623
–6
35
CODE IN HEX
SNR
THD
52500
131072
CODE
36
53936
37
–4
11212
38
196608
263
39
VDD = REF = 5V
–2
3A
3
3B
0
AD7690
262144
3C
0
0
–110
–112
–114
–116
–118
–120
–122
–124
–126
–128
–130