AD9020

–11–

REV. A

1

2

4

6 8 10

20

60

100

200

40

INPUT FREQUENCY – MHz

20

26

32

38

44

50

56

62

10.0

9.0

8.0

7.0

6.0

5.0

4.0

ENCODE RATE = 40MSPS

+25

°C

+55

°C & +125°C

AD9020 SNR and ENOB vs. Input Frequency

1

2

4

6

8 10

20

60

100

40

40

45

50

55

60

65

70

INPUT FREQUENCY – MHz

35

30

+125 C

–55 C

+25 C

AD9020 Harmonics vs. Input Frequency

20

26

32

38

44

50

56

62

10.0

9.0

8.0

7.0

6.0

5.0

4.0

1

2

4

6

8 10

20

40

100

CONVERSION RATE – MSPS

60

ANALOG INPUT = 2.3MHz

AD9020 SNR and ENOB vs. Conversion Rate

ANALOG INPUT

– Volts

(A

)

IN

48

47

45

44

–1.8

–1.2

–0.6

0

10

70

60

50

40

30

20

0.6

+

1.2

+

1.8

+

46

RESISTANCE

CAPACITANCE

Input Capacitance/Resistance vs. Input Voltage

AD9020 Truth Table

Offset Binary

Twos Complement

Step

Range

True

Inverted

True

Inverted

0

= –1.75 V

MSB INV = “0”

MSB INV = “1”

MSB INV = “1”

MSB INV = “0”

FS = +1.75 V

LSBs INV = “0”

LSBs INV = “1”

LSBs INV = “0”

LSBs INV = “1”

1024

> +1.7500

(1)1111111111

(1)0000000000

(1)0111111111

(1)1000000000

1023

+1.7466

1111111111

0000000000

0111111111

1000000000

1022

+1.7432

1111111110

0000000001

0111111110

1000000001

••

•

•

•

•

••

•

•

•

•

••

•

•

•

•

512

+0.0034

1000000000

0111111111

0000000000

1111111111

511

0.000

0111111111

1000000000

1111111111

0000000000

510

–0.0034

0111111110

1000000001

1111111110

0000000001

••

•

•

•

•

••

•

•

•

•

••

•

•

•

•

02

–1.7432

0000000010

1111111101

1000000010

0111111101

01

–1.7466

0000000001

1111111110

1000000001

0111111110

00

<–1.7466

0000000000

1111111111

1000000000

0111111111

The overflow bit is always 0 except where noted in parentheses ( ). MSB INVERT and LSBs INVERT are considered dc controls.