AD7661 Analog Devices, AD7661 Datasheet - Page 13

• Manufacturer Part Number: AD7661
• Manufacturer: Analog Devices

Specifications of AD7661

• Resolution (bits): 16bit
• # Chan: 1
• Sample Rate: 100kSPS
• Interface: Par,Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (Vref) p-p,2.5V p-p,Uni (Vref),Uni 2.5V
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

91
90
89
88
87
86
85
84
83
82
81
140000
120000
100000
80000
60000
40000
20000
–100
–120
–140
–160
–180
1
–20
–40
–60
–80
0
0
0
7FFD 7FFE 7FFF 8000 8001 8002 8003 8004 8005 8006
Figure 11. Histogram of 261,120 Conversions of a
Figure 13. SNR, S/(N+D), and ENOB vs. Frequency
f
f
SNR = 89.2dB
THD = –102dB
SFDR = 103.1dB
S/[N+D] = 88.9dB
0
S
IN
= 100kSPS
= 45kHz
0
DC Input at the Code Transition
10
370
10
FREQUENCY (kHz)
Figure 12. FFT Plot
16406
CODE IN HEX
FREQUENCY (kHz)
116740
20
ENOB
117518
100
30
10005
81
SNR
S/[N+D ]
40
0
1000
0
15.5
15.0
14.5
14.0
13.5
13.0
50
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–100
–105
–110
–115
–120
–70
–75
–80
–85
–90
–95
180000
160000
140000
120000
100000
Figure 16. SNR and S/(N+D) vs. Input Level (Referred to Full Scale)
80000
60000
40000
20000
92
91
90
89
88
87
1
–60
0
Figure 15. THD, Harmonics, and SFDR vs. Frequency
S/[N+D]
SNR
7FFC
Figure 14. Histogram of 261,120 Conversions of a
0
THIRD
HARMONIC
–50
7FFD 7FFE 7FFF 8000
59
10
DC Input at the Code Center
5181
–40
FREQUENCY (kHz)
THD
INPUT LEVEL (dB)
61586
CODE IN HEX
–30
134409
SFDR
SECOND
HARMONIC
56132
8001
–20
100
3745
8002
–10
8003
8
AD7661
1000
8004
0
120
110
100
90
80
70
60
50
40
30
20
0