REV. B

–4–

AD876

SOIC

TQFP

Symbol

Pin No.

Pin No.

Type

Name and Function

D0 (LSB)

3

1

DO

Least Significant Bit.

D1–D4

4–7

2–5

DO

Data Bits 1 through 4.

D5–D8

8–11

8–11

Data Bits 5 through 8.

D9 (MSB)

12

12

DO

Most Significant Bit.

THREE-

16

23

DI

THREE-STATE = LOW

THREE-STATE = HIGH

STATE

or N/C

Normal Operating Mode

High Impedance Outputs

STBY

17

24

DI

STBY = LOW or N/C

STBY = HIGH

Normal Operating Mode

Standby Mode

CLK

15

22

DI

Clock Input.

CML

26

38

AO

Bypass Pin for an Internal Bias Point.

REFTF

22

30

AI

Reference Top Force.

REFBF

24

34

AI

Reference Bottom Force.

REFTS

21

29

AI

Reference Top Sense.

REFBS

25

35

AI

Reference Bottom Sense.

AIN

27

39

AI

Analog Input.

28

42

P

+5 V Analog Supply.

1

44

P

Analog Ground.

18

26

P

+5 V Digital Supply.

14, 19, 20

17, 27, 28

P

Digital Ground.

2

45

P

+3.3 V/+5 V Digital Supply. Supply for digital

input and output buffers.

13

16

P

+3.3 V/+5 V Digital Ground. Ground for digital

input and output buffers.

Type: AI = Analog Input; AO = Analog Output; DI = Digital Input; DO = Digital Output; P = Power.

PIN CONFIGURATIONS

SOIC/SSOP

TQFP

PIN FUNCTION DESCRIPTIONS

PINS D0 AND D1 ARE LEFT OPEN

FOR THE AD876JR-8

*

AIN

D2

D3

D4

REFBF

REFTF

CML

REFBS

D5

REFTS

D6

D7

D8

D9

STBY

THREE-STATE

CLK

13

18

1

2

28

27

5

6

7

24

23

22

3

4

26

25

8

21

9

20

10

19

11

12

17

16

14

15

TOP VIEW

(Not to Scale)

AD876

NC

NC = NO CONNECT

REFBS

REFTF

REFBF

D0

D1

D4

D5

D6

D2

D3

REFTS

D8

D9

D7

41

42

43

47

45

46

17

20

19

18

14

16

15

36

35

32

31

30

34

33

44

1

2

5

6

7

3

4

37

38

39

21

24

23

22

40

28

27

26

29

9

10

11

8

48

13

25

12

TOP VIEW

(Not to Scale)

AD876