AD7265 Analog Devices, AD7265 Datasheet - Page 10

• Manufacturer Part Number: AD7265
• Description: Differential/Single-Ended Input, Dual 1 MSPS, 12-Bit, 3-Channel SAR A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7265

• Resolution (bits): 12bit
• # Chan: 12
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

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