AD9020
62
56
50
10.0
9.0
62
56
50
44
10.0
ENCODE RATE = 40MSPS
9.0
ANALOG INPUT = 2.3MHz
25؇C
8.0
7.0
6.0
5.0
4.0
8.0
44
38
32
26
20
7.0
6.0
55؇C & 125؇C
38
32
26
20
5.0
4.0
1
10
100
200
1
10
100
INPUT FREQUENCY – MHz
CONVERSION RATE – MSPS
Figure 10. SNR and ENOB vs. Input Frequency
Figure 12. SNR and ENOB vs. Conversion Rate
70
30
35
50
60
49
48
RESISTANCE
40
45
50
55
60
125؇C
50
40
30
20
47
–55؇C
25؇C
46
45
CAPACITANCE
10
0
44
43
65
70
–1.8
–1.2
–0.6
0
1.2
1.8
0.6
10
INPUT FREQUENCY – MHz
100
1
ANALOG INPUT (AIN) – Volts
Figure 11. Harmonics vs. Input Frequency
Figure 13. Input Capacitance/Resistance vs. Input Voltage
Table I. Truth Table
Offset Binary
Two’s Complement
Range
True
Inverted
True
Inverted
0
= –1.75 V
MSB INV = “0”
LSBs INV = “0”
MSB INV = “1”
LSBs INV = “1”
MSB INV = “1”
LSBs INV = “0”
MSB INV = “0”
LSBs INV = “1”
Step
FS = +1.75 V
1024
1023
1022
•
•
•
512
511
510
•
> +1.7500
(1)1111111111
(1)0000000000
(1)0111111111
(1)1000000000
+1.7466
1111111111
0000000000
0111111111
1000000000
+1.7432
1111111110
0000000001
0111111110
1000000001
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
+0.0034
0.000
–0.0034
•
1000000000
0111111111
0111111110
•
0111111111
1000000000
1000000001
•
0000000000
1111111111
1111111110
•
1111111111
0000000000
0000000001
•
•
•
•
•
•
•
•
•
•
•
•
•
02
01
00
–1.7432
–1.7466
<–1.7466
0000000010
0000000001
0000000000
1111111101
1111111110
1111111111
1000000010
1000000001
1000000000
0111111101
0111111110
0111111111
The overflow bit is always 0 except where noted in parentheses ( ). MSB INVERT and LSBs INVERT are considered dc controls.
REV. C
–11–
ADI [ ADI ]
