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AD7674 Datasheet(PDF) 13 Page - Analog Devices

Part No. AD7674
Description  18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7674 Datasheet(HTML) 13 Page - Analog Devices

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AD7674
Rev. A | Page 13 of 28
POSITIVE DNL (LSB)
120
0
100
60
20
0
40
80
0.5
1.0
1.5
03083-0-011
2.0
Figure 11. Typical Positive DNL Distribution (424 Units)
FREQUENCY (kHz)
0
0
50
100
400
–40
–60
–100
–180
–80
–120
03083-0-012
–140
–20
–160
150
200
250
300
350
fS = 800kSPS
fIN = 10kHz
VREF = 4.096V
SNR = 98.4dB
THD = 119.1dB
SFDR = 120.4dB
SINAD = 98.4dB
Figure 12. FFT (10 kHz Tone)
FREQUENCY (kHz)
0
0
50
100
400
–40
–60
–100
–180
–80
–120
03083-0-013
–140
–20
–160
150
200
250
300
350
fS = 800kSPS
fIN = 100kHz
VREF = 4.096V
SNR = 98.8dB
THD = 104.3dB
SFDR = 104.9dB
SINAD = 97.8dB
Figure 13. FFT (100 kHz Tone)
NEGATIVE DNL (LSB)
250
–2.0
200
150
50
0
–1.5
–1.0
–0.5
03083-0-014
100
0
Figure 14. TypicalNegative DNL Distribution (424 Units)
FREQUENCY (kHz)
102
1
99
90
78
75
84
96
10
100
1000
03083-0-015
93
81
87
ENOB
S/(N+D)
SNR
16.0
16.5
15.0
15.5
14.0
14.5
13.5
Figure 15. SNR, S/(N+D), and ENOB vs. Frequency
FREQUENCY (kHz)
–60
1
–70
–100
–130
–120
–80
10
100
1000
03083-0-016
–90
–110
THD
THIRD
HARMONIC
SFDR
140
60
20
40
0
120
80
100
SECOND
HARMONIC
Figure 16. THD, SFDR, and Harmonics vs. Frequency


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