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AD7678ASTZ Datasheet(PDF) 13 Page - Analog Devices

Part # AD7678ASTZ
Description  18-Bit, 2.5 LSB INL, 100 kSPS SAR ADC
PDF  29 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7678ASTZ Datasheet(HTML) 13 Page - Analog Devices

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AD7678
Rev. A | Page 12 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
CODE
2.5
0
65536
131072
196608
262144
1.5
1.0
0
–2.5
0.5
–0.5
03084-0-005
–1.5
2.0
–2.0
–1.0
Figure 5. Integral Nonlinearity vs. Code
CODE IN HEX
70000
20015
60000
40000
20000
0
30000
10000
50000
20016 20017 20018 20019 2001A2001B2001C2001D 2001E
VREF = 5V
03084-0-006
032
5919
60158 59966
3931
42
00
0
Figure 6. Histogram of 131,072 Conversions of a
DC Input at the Code Transition
FREQUENCY (kHz)
0
0
5
10
50
–40
–60
–100
–180
–80
–120
03084-0-012
–140
–20
–160
15
20
25
30
35
40
45
fS = 100kSPS
fIN = 11kHz
VREF = 4.096V
SNR = 99.6dB
THD = –116dB
SFDR = 116.2dB
S/(N+D) = 99.5dB
Figure 7. FFT (11 kHz Tone)
CODE
2.0
0
65536
131072
196608
262144
1.5
1.0
0
–1.0
0.5
–0.5
03084-0-008
Figure 8. Differential Nonlinearity vs. Code
CODE IN HEX
90000
2001B
60000
40000
20000
0
30000
10000
50000
2001C 2001D 2001E 2001F 20020 20021 20022 20023
VREF = 5V
70000
80000
03084-0-009
0
522
21862
83610
23000
1053
1
00
Figure 9. Histogram of 131,072 Conversions of a
DC Input at the Code Center
FREQUENCY (kHz)
102
0
100
98
94
96
10
40
50
03084-0-015
ENOB
S/(N+D)
SNR
16.6
16.4
16.0
16.2
15.8
20
30
Figure 10. SNR, S/(N+D), and ENOB vs. Frequency



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