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參數(shù)資料
| 型號(hào)： | AD7722AS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 195 kSPS CMOS, Sigma-Delta ADC |
| 中文描述： | 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL/PARALLEL ACCESS, PQFP44 |
| 封裝： | MS-022AA, MQFP-44 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大小： | 526K |
| 代理商： | AD7722AS |
(AV
DD
= DV
DD
= 5.0 V, T
A
= +25
8
C; CLKIN = 12.5 MHz, AIN = 20 kHz, Bipolar Mode; V
IN
(+) = 0 V to 2.5 V, V
IN
(–) = 1.25 V unless otherwise noted)
Typical Characteristics–AD7722
INPUT LEVEL – dB
d
110
100
50–40
–30
0
–20
–10
90
80
70
60
SFDR
S/(N+D)
Figure 9. S/(N+D) and SFDR vs.
Analog Input Level
INPUT FREQUENCY – kHz
d
–85
–90
–1150
20
100
40
60
80
–95
–100
–105
–110
THD
SNR
SFDR
V
IN
(+) = V
IN
(–) = 1.25Vpk–pk
V
CM
= 2.5V
Figure 12. SNR, THD, and SFDR vs.
Input Frequency
TEMPERATURE –
°
C
d
–94
–116
–50
–25
100
0
25
50
75
–96
–108
–110
–112
–114
–100
–102
–106
–104
–98
THD
3RD
4TH
2ND
Figure 15. THD vs. Temperature
–11–
REV. 0
OUTPUT DATA RATE – kSPS
d
84
92
85
88
89
90
91
86
87
0
50
300
100
150
200
250
AIN = 1/5
·
BW
Figure 10. S/(N+D) vs. Output
Sample Rate
OUTPUT DATA RATE – kSPS
d
84
92
85
88
89
90
91
86
87
0
50
300
100
150
200
250
AIN = 1/5
·
BW
V
IN
(+) = V
IN
(–) = 1.25Vpk–pk
V
CM
= 2.5V
Figure 13. S/(N+D) vs. Output
Sample Rate
CODES
F
5000
0
n–3
n–2
n+3
n–1
n
n+1
n+2
4500
2000
1500
1000
500
4000
3500
2500
3000
V
IN
(+) = V
IN
(–)
CLKIN = 12.5MHz
8k SAMPLES
Figure 16. Histogram of Output
Codes with DC Input
INPUT FREQUENCY – kHz
d
–85
–90
–1150
20
100
40
60
80
–95
–100
–105
–110
SNR
SFDR
THD
Figure 11. SNR, THD, and SFDR vs.
Input Frequency
TEMPERATURE –
°
C
92.0
91.5
88.0
–50
0
100
50
90.0
89.5
88.5
89.0
91.0
90.5
d
Figure 14. SNR vs. Temperature
CODE
D
1.0
0.8
–1.0
0
20000
65535
40000
–0.4
–0.8
–0.6
0
–0.2
0.6
0.2
0.4
Figure 17. Differential Nonlinearity
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