Datasheet

AD7985
Rev. A | Page 9 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = DVDD = VIO = 2.5 V, BVDD = 5.0 V, V
REF
= 5.0 V, external reference (PDREF is high, REFIN is low), unless otherwise noted.
1.25
–1.25
–1.00
–0.75
–0.50
–0.25
0
0.25
0.50
0.75
1.00
0 16,384 32,768 49,152 65,536
INL (LSB)
CODE
POSITIVE INL = +0.38LSB
NEGATIVE INL = –0.46LSB
07947-105
Figure 5. Integral Nonlinearity vs. Code
60,000
50,000
40,000
30,000
20,000
10,000
0
COUNTS
CODE IN HEX
7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004
0
122
6150
38,843
57,138
26,249
2537
33
0
07947-106
Figure 6. Histogram of DC Input at Code Center (External Reference)
60,000
50,000
40,000
30,000
20,000
10,000
0
COUNTS
CODE IN HEX
7FFD7FFC7FFB 7FFE 7FFF 8000 8001 8002 8003 8004 8005
0
11
565
33,064
49,585
31,957
7024
403
8
0
8455
07947-107
Figure 7. Histogram of DC Input at Code Center (Internal Reference)
1.00
–1.00
–0.75
–0.50
–0.25
0
0.25
0.50
0.75
0 16,384 32,768 49,152 65,536
DNL (LSB)
CODE
POSITIVE DNL = +0.19LSB
NEGATIVE DNL = –0.20LSB
07947-108
Figure 8. Differential Nonlinearity vs. Code
60,000
50,000
40,000
30,000
20,000
10,000
0
COUNTS
CODE IN HEX
7FFD7FFC7FFB 7FFE 7FFF 8000 8001 8002 8003 8004
0 2
479
11,888
48,730
53,522
15,645
800
6
0
07947-109
Figure 9. Histogram of DC Input at Code Transition (External Reference)
50,000
45,000
40,000
35,000
30,000
25,000
20,000
15,000
10,000
5000
0
COUNTS
CODE IN HEX
7FFE7FFD7FFC 7FFF 8000 8001 8002 8003 8004 8005
0
90
2947
20,474
46,649
43,622
15,598
1662
30
0
07947-110
Figure 10. Histogram of DC Input at Code Transition (Internal Reference)