AD9002

–4–

REV. D

FUNCTIONAL DESCRIPTION

Pin #

Name

Description

1

DIGITAL GROUND

One of four digital ground pins. All digital ground pins should be connected together.

2

OVERFLOW INH

OVERFLOW INHIBIT controls the data output polarity for overvoltage inputs.

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a

n

A

d

e

l

b

a

n

E

w

o

l

f

r

e

v

O

)

V

2

.

5

–

r

o

g

n

i

t

a

o

l

F

(

D

f

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D

–

1

w

o

l

f

r

e

v

O)

D

N

G

(

d

e

t

i

b

i

h

n

I

D

f

o8

D

–

1

I

V

+

>

F

E

R

0

0

0

0

0

0

0

0

11

1

1

1

1

1

1

1

0

I

≤ V

+

F

E

R

X

X

X

X

X

X

X

X

0X

X

X

X

X

X

X

X

0

3

HYSTERESIS

The Hysteresis control voltage varies the comparator hysteresis from 0 mV to 10 mV, for a change

from –5.2 V to –2.2 V at the Hysteresis control pin. Normally converted to –5.2 V.

The most positive reference voltage for the internal resistor ladder.

5

ANALOG INPUT

One of two analog input pins. Both analog input pins should be connected together.

6

ANALOG GROUND

One of two analog ground pins. Both analog ground pins should be connected together.

7

ENCODE

Noninverted input of the differential encode input. This pin is driven in conjunction with

ENCODE. Data is latched on the rising edge of the ENCODE signal.

8

ENCODE

Inverted input of the differential encode input. This pin is driven in conjunction with ENCODE.

9

ANALOG GROUND

One of two analog ground pins. Both analog ground pins should be connected together.

10

ANALOG INPUT

One of two analog input pins. Both analog inputs should be connected together.

11

The most negative reference voltage for the internal resistor ladder.

12

The midpoint tap on the internal resistor ladder.

13

DIGITAL GROUND

One of four digital ground pins. All digital ground pins should be connected together.

14

One of two negative digital supply pins (nominally –5.2 V). Both digital supply pins should be con-

nected together.

15

D1 (LSB)

Digital data output.

16–19

D2–D5

Digital data output.

20

DIGITAL GROUND

One of four digital ground pins. All digital ground pins should be connected together.

21, 22

One of two negative analog supply pins (nominally –5.2 V). Both analog supply pins should be con-

nected together.

23

DIGITAL GROUND

One of four digital ground pins. All digital ground pins should be connected together.

24, 25

D6, D7

Digital data output.

26

D8 (MSB)

Digital data output.

27

OVERFLOW

INHIBIT is enabled (overflow enabled, –5.2 V). See OVERFLOW INHIBIT.

28

One of two negative digital supply pins (nominally –5.2 V). Both digital supply pins should be

connected together.

DIP

TOP VIEW

(Not to Scale)

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

AD9002

DIGITAL

GROUND

ANALOG INPUT

ANALOG

GROUND

ENCODE

DIGITAL

GROUND

OVERFLOW INH

HYSTERESIS

ENCODE

ANALOG

GROUND

ANALOG INPUT

D1(LSB)

D2

D3

D4

D5

DIGITAL

GROUND

OVERFLOW

D8(MSB)

D7

DIGITAL

GROUND

D6

LCC

28

27

1

2

3

426

25

21

22

23

24

19

20

5

6

7

8

9

10

11

12 13 14 15 16 17 18

TOP VIEW

(Not to Scale)

D7

D6

DIGITAL

GROUND

D5

ANALOG INPUT

ANALOG

GROUND

ENCODE

ENCODE

ANALOG INPUT

AD9002

DIGITAL

GROUND

ANALOG

GROUND

JLCC

TOP VIEW

(Not to Scale)

TOP VIEW

(Not to Scale)

25 24

23 22

21 20 19

5

6

7

8

9

10

11

18

17

16

15

14

13

12

26

27

28

1

2

3

4

D3

D2

D1(LSB)

D8(MSB)

OVERFLOW

DIGITAL

GROUND

OVERFLOW INH

HYSTERESIS

D4

AD9002

DIGITAL

GROUND

PIN DESIGNATIONS