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AD7678ASTZ

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AD7678
Rev. A | Page 12 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
CODE
2.5
0 65536 131072 196608 262144
INL-LSB (18-Bit)
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
COUNTS
60000
40000
20000
0
30000
10000
50000
20016 20017 20018 20019 2001A2001B2001C2001D2001E
V
REF
= 5V
03084-0-006
032
5919
60158
59966
3931
42
000
Figure 6. Histogram of 131,072 Conversions of a
DC Input at the Code Transition
FREQUENCY (kHz)
0
0 5 10 50
AMPLITUDE (dB of Full Scale)
–40
–60
–100
–180
–80
–120
03084-0-012
–140
–20
–160
15 20 25 30 35
40 45
f
S
= 100kSPS
f
IN
= 11kHz
V
REF
= 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 26214
4
DNL-LSB (18-Bit)
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
COUNTS
60000
40000
20000
0
30000
10000
50000
2001C 2001D 2001E 2001F 20020 20021 20022 20023
V
REF
= 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
SNR AND S/[N+D] (dB)
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
ENOB (Bits)
20 30
Figure 10. SNR, S/(N+D), and ENOB vs. Frequency
AD7678
Rev. A | Page 13 of 28
FREQUENCY (kHz)
–80
0
THD, HARMONICS (dB)
–90
–120
–150
–140
–100
10 40 50
03084-0-016
–110
–130
THD
THIRD
HARMONIC
SECOND
HARMONIC
20 30
Figure 11. THD and Harmonics vs. Frequency
INPUT LEVEL (dB)
–60
SNR REFERRED TO FULL SCALE (dB)
101
98
100
03084-0-017
99
SNR
–50 0–10–20–30–40
104
102
103
V
REF
= 4.096V
S/(N+D)
Figure 12. SNR and S/(N+D) vs. Input Level
–55
SNR, S/[N+D] (dB)
99
97
03084-0-018
100
98
–35 12585655–15
101
SNR
ENOB
14.5
15.0
15.5
16.5
16.0
S/(N+D)
25 45 105
TEMPERATURE (C)
Figure 13. SNR, S/(N+D), and ENOB vs. Temperature
TEMPERATURE (C)
–55
THD, HARMONICS (dB)
–120
–140
03084-0-019
–110
–130
–35 12585655–15
–100
25 45 105
THIRD
HARMONIC
SECOND
HARMONIC
THD
Figure 14. THD and Harmonics vs. Temperature
SAMPLING RATE (SPS)
10000
OPERATING CURRENT (
A)
0.001
1000
100
0.1
0.01
100k10k1k1001
10
AVDD
03084-0-020
DVDD
OVDD
10
1
Figure 15. Operating Current vs. Sampling Rate
TEMPERATURE (
C)
1000
–55
POWER-DOWN OPERATING CURRENTS (nA)
800
0
400
200
600
125
DVDD
–35–155 25456585105
AVDD
OVDD
03084-0-021
Figure 16. Power-Down Operating Currents vs. Temperature
AD7678
Rev. A | Page 14 of 28
TEMPERATURE (
C)
–55
ZERO ERROR, GAIN ERROR (LSB)
–30
–50
03083-0-022
–40
–35 12585655–15
50
25 45 105
–10
10
–20
0
20
30
40
GAIN ERROR
ZERO ERROR
Figure 17. Zero Error and Gain Error vs. Temperature
C
L
(pF)
0
t
12
DELAY (ns)
10
0
03084-0-024
20015050
50
100
30
20
40
OVDD = 2.7V @ 85°C
OVDD = 5V @ 85°C
OVDD = 5V @ 25°C
OVDD = 2.7V @ 25°C
Figure 18. Typical Delay vs. Load Capacitance C
L
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AD7678ASTZ

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Analog to Digital Converters - ADC IC 18-Bit 100 kSPS
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