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AD7266 Datasheet(PDF) 11 Page - Analog Devices

Part # AD7266
Description  Differential/Single-Ended Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7266 Datasheet(HTML) 11 Page - Analog Devices

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AD7266
Rev. B | Page 10 of 28
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. VREF
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
Figure 11. Effective Number of Bits vs. VREF
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
Figure 12. VREF vs. Reference Output Current Drive
CODE
2046
2047
2049
2048
2050
10000
8000
9000
6000
7000
4000
5000
2000
1000
3000
0
10000
CODES
DIFFERENTIAL
MODE
INTERNAL
REFERENCE
Figure 13. Histogram of Codes for 10k Samples in Differential 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 14. Histogram of Codes for 10k Samples in Single-Ended Mode
RIPPLE FREQUENCY (kHz)
1200
0
200
400
600
800
1000
–60
–65
–70
–75
–80
–85
–95
–90
–100
DIFFERENTIAL MODE
VDD = 3V/5V
Figure 15. CMRR vs. Common-Mode Ripple Frequency


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