AD9481 datasheet(9/28 Pages) AD

Part #	AD9481

Description	8-Bit, 250 MSPS 3.3 V A/D Converter

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AD9481

Rev. 0 | Page 9 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

2

3

4

5

6

7

8

9

10

11

12

CLK–

AVDD

AGND

D7A (MSB)

DRGND

DRVDD

CLK+

D6A

D5A

D4A

D3A

33

32

31

30

29

28

27

26

25

24

23

AGND

AVDD

DRGND

S1

PDWN

SENSE

D7B (MSB)

D6B

D5B

D4B

13 14

15

16 17 18

19

20

21

22

PIN 1

44 43 42

41

40 39 38

37

36

35

34

AD9481

TOP VIEW

(Not to Scale)

Figure 3. Pin Configuration

Table 7. Pin Function Descriptions

No.

Name

Description

1

CLK+

Input Clock—True

2

CLK−

Input Clock—Complement

3

AVDD

3.3 V Analog Supply

4

AGND

Analog Ground

5

DRVDD

3.3 V Digital Output Supply

6

DRGND

Digital Ground

7

D7A

Data Output Bit 7—Channel A (MSB)

8

D6A

Data Output Bit 6—Channel A

9

D5A

Data Output Bit 5—Channel A

10

D4A

Data Output Bit 4—Channel A

11

D3A

Data Output Bit 3—Channel A

12

D2A

Data Output Bit 2—Channel A

13

D1A

Data Output Bit 1—Channel A

14

D0A

Data Output Bit 0—Channel A (LSB)

15

DRGND

Digital Ground

16

DCO−

Data Clock Output—Complement

17

DCO+

Data Clock Output—True

18

DRVDD

3.3 V Digital Output Supply

19

D0B

Data Output Bit 0—Channel B (LSB)

20

D1B

Data Output Bit 1—Channel B

21

D2B

Data Output Bit 2—Channel B

22

D3B

Data Output Bit 3—Channel B

23

D4B

Data Output Bit 4—Channel B

24

D5B

Data Output Bit 5—Channel B

No.

Name

Description

25

D6B

Data Output Bit 6—Channel B

26

D7B

Data Output Bit 7—Channel B (MSB)

27

DRGND

Digital Ground

28

S1

Data Format Select and Duty Cycle Stabilizer

Select

29

PDWN

Power-Down Selection

30

AVDD

3.3 V Analog Supply

31

AVDD

3.3 V Analog Supply

32

AGND

Analog Ground

33

SENSE

Reference Mode Selection

34

VREF

Voltage Reference Input/Output

35

AGND

Analog Ground

36

AVDD

3.3 V Analog Supply

37

AGND

Analog Ground

38

VIN−

Analog Input—Complement

39

VIN+

Analog Input—True

40

AGND

Analog Ground

41

AVDD

3.3 V Analog Supply

42

S3

DCO Enable Select (Tie to AVDD for DCO

Active)

43

DS−

Data Sync Complement (If Unused, Tie to

DRVDD)

44

DS+

Data Sync True (If Unused, Tie to DGND)

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