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AD7265 数据表(PDF) 11 Page - Analog Devices

部件名 AD7265
功能描述  Differential/Single-Ended Input, Dual 1 MSPS, 12-Bit, 3-Channel SAR ADC
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7265 数据表(HTML) 11 Page - Analog Devices

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AD7265
Rev. A | Page 10 of 28
CODE
2046
2047
2049
2048
2050
10000
8000
9000
6000
7000
4000
5000
2000
1000
3000
0
10000
CODES
DIFFERENTIAL
MODE
INTERNAL
REFERENCE
VREF (V)
2.5
0
0.5
1.0
1.5
2.0
1.0
0.6
0.8
0.2
0.4
–0.2
0
–0.6
–0.4
–1.0
–0.8
VDD = 3V/5V
DIFFERENTIAL MODE
POSITIVE INL
POSITIVE DNL
NEGATIVE DNL
NEGATIVE INL
Figure 10. Linearity Error vs. V
Figure 13. Histogram of Codes for 10k Samples in Differential Mode
REF
VREF (V)
5.0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
12.0
11.0
11.5
10.0
10.5
9.0
9.5
8.0
7.5
8.5
7.0
VDD = 5V
DIFFERENTIAL MODE
VDD = 3V
DIFFERENTIAL MODE
VDD = 3V
SINGLE-ENDED MODE
VDD = 5V
SINGLE-ENDED MODE
CODE
2046
2047
2048
2049
2050
10000
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
9984
CODES
SINGLE-ENDED
MODE
INTERNAL
REFERENCE
5 CODES
11 CODES
Figure 11. Effective Number of Bits vs. VREF
Figure 14. Histogram of Codes for 10k Samples in Single-Ended Mode
CURRENT LOAD (
μA)
200
0
20
40
60
80
100
120
140
160
180
2.5010
2.5000
2.5005
2.4995
2.4990
2.4985
2.4980
RIPPLE FREQUENCY (kHz)
1200
0
200
400
600
800
1000
–60
–65
–70
–75
–80
–85
–95
–90
–100
DIFFERENTIAL MODE
VDD = 3V/5V
vs. Reference Output Current Drive
Figure 12. VREF
Figure 15. CMRR vs. Common-Mode Ripple Frequency


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