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AD7666AST Datasheet(PDF) 14 Page - Analog Devices

Part # AD7666AST
Description  16-Bit 500 kSPS PulSAR Unipolar ADC with Reference
PDF  29 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7666AST Datasheet(HTML) 14 Page - Analog Devices

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AD7666
Rev. 0 | Page 13 of 28
0
20000
40000
60000
80000
100000
120000
7FFE
7FFF
8000
8001
8002
8003
7FFD
8004
CODE IN HEX
7FFC
0
211
623
4
20187
15968
1
112335
111791
0
Figure 11. Histogram of 261,120 Conversions of a
DC Input at the Code Transition
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
0
50
100
150
200
250
FREQUENCY (kHz)
fS = 500kSPS
fIN = 101.361kHz
SNR = 88.6dB
THD = –98.1dB
SFDR = 99.2dB
S/[N+D] = 88.1dB
Figure 12. FFT Plot
SNR
S/[N+D]
ENOB
81
82
83
84
85
86
87
88
89
90
91
1
10
100
1000
FREQUENCY (kHz)
13.0
13.5
14.0
14.5
15.0
15.5
Figure 13. SNR, S/(N+D), and ENOB vs. Frequency
0
11
2789
3300
34
0
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
CODE IN HEX
7FFA 7FFB 7FFC 7FFD 7FFE
7FFF
8000
8001
8002
148481
53814
52691
Figure 14. Histogram of 261,120 Conversions of a
DC Input at the Code Center
SFDR
THD
SECOND
HARMONIC
THIRD
HARMONIC
–120
–115
–110
–105
–100
–95
–90
–85
–80
–75
–70
1
10
100
1000
FREQUENCY (kHz)
20
30
40
50
60
70
80
90
100
110
120
Figure 15. THD, Harmonics, and SFDR vs. Frequency
88
89
90
91
–60
–50
–40
–30
–20
–10
0
INPUT LEVEL (dB)
SNR
S/[N+D]
Figure 16. SNR and S/(N+D) vs. Input Level (Referred to Full Scale)



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