AD9020
62
10.0
ENCODE RATE = 40MSPS
56
9.0
50
8.0
+25°C
44
7.0
+55°C & +125°C
38
6.0
32
5.0
26
4.0
20
1
2 4 6 8 10 20 40 60 100 200
INPUT FREQUENCY – MHz
AD9020 SNR and ENOB vs. Input Frequency
62
10.0
56
9.0
ANALOG INPUT = 2.3MHz
50
8.0
44
7.0
38
6.0
32
5.0
26
4.0
20
1
2
4 6 8 10
20 40 60 100
CONVERSION RATE – MSPS
AD9020 SNR and ENOB vs. Conversion Rate
30
35
40
+125 C
45
50
–55 C
55
+25 C
60
65
70
1
2
4 6 8 10
20
40 60 100
INPUT FREQUENCY – MHz
AD9020 Harmonics vs. Input Frequency
48
RESISTANCE
47
46
45
44
70
60
50
40
CAPACITANCE
30
20
10
–1.8 –1.2 –0.6
0
+0.6 +1.2 +1.8
ANALOG INPUT (AIN ) – Volts
Input Capacitance/Resistance vs. Input Voltage
AD9020 Truth Table
Step
Range
0 = –1.75 V
FS = +1.75 V
Offset Binary
True
Inverted
MSB INV = “0”
MSB INV = “1”
LSBs INV = “0”
LSBs INV = “1”
Twos Complement
True
Inverted
MSB INV = “1”
MSB INV = “0”
LSBs INV = “0” LSBs INV = “1”
1024
1023
1022
•
•
•
512
511
510
•
•
•
02
01
00
> +1.7500
+1.7466
+1.7432
•
•
•
+0.0034
0.000
–0.0034
•
•
•
–1.7432
–1.7466
<–1.7466
(1)1111111111
1111111111
1111111110
•
•
•
1000000000
0111111111
0111111110
•
•
•
0000000010
0000000001
0000000000
(1)0000000000
0000000000
0000000001
•
•
•
0111111111
1000000000
1000000001
•
•
•
1111111101
1111111110
1111111111
(1)0111111111
0111111111
0111111110
•
•
•
0000000000
1111111111
1111111110
•
•
•
1000000010
1000000001
1000000000
(1)1000000000
1000000000
1000000001
•
•
•
1111111111
0000000000
0000000001
•
•
•
0111111101
0111111110
0111111111
The overflow bit is always 0 except where noted in parentheses ( ). MSB INVERT and LSBs INVERT are considered dc controls.
REV. A
–11–