FUNCTIONAL BLOCK DIAGRAM

R

B

R

F

DAC A

DAC A

LATCH

INPUT

LATCH A

INPUT

LATCH B

INPUT

LATCH C

INPUT

LATCH D

INPUT

LATCH E

INPUT

LATCH F

INPUT

LATCH G

DAC B

LATCH

DAC C

LATCH

DAC D

LATCH

DAC E

LATCH

DAC F

LATCH

DAC G

LATCH

DAC B

DAC C

DAC D

DAC E

DAC F

DAC G

V

B

REF

V

D

REF

R

G

FB

V

G

REF

V

F

REF

V

E

REF

FB

FB

R

E

R

D

R

C

FB

FB

R

A

FB

REF

V

A

V

C

REF

V

DD

DGND

LDAC

CLR

AD7568

12

12

12

12

12

12

12

12

12

12

12

12

12

12

V

H

REF

A0

CONTROL LOGIC

+

INPUT SHIFT

REGISTER

CLKIN

SDIN

SDOUT

INPUT

LATCH H

DAC H

LATCH

DAC H

R

H

FB

12

12

FSIN

I

A

I

A

I

B

I

B

I

C

I

D

I

C

I

D

I

E

I

F

I

E

I

F

I

G

I

H

I

G

I

H

AGND

12

OUT1

OUT2

OUT1

OUT2

OUT1

OUT2

FB

OUT1

OUT2

OUT1

OUT2

OUT1

OUT2

OUT1

OUT2

OUT1

OUT2

a

Octal 12-Bit DAC

AD7568

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

FEATURES

Eight 12-Bit DACs in One Package

4-Quadrant Multiplication

Separate References

Single +5 V Supply

Low Power: 1 mW

Versatile Serial Interface

Simultaneous Update Capability

Reset Function

44-Pin PQFP and PLCC

APPLICATIONS

Process Control

Automatic Test Equipment

General Purpose Instrumentation

PIN CONFIGURATIONS

Plastic Quad Flatpack

Plastic Leaded Chip Carrier

AD7568

TOP VIEW

(Not to Scale)

33

32

31

30

29

28

27

26

25

24

23

1

2

3

4

5

6

7

8

9

10

11

PIN 1 IDENTIFIER

NC

V

B

REF

R

G

FB

V

G

REF

V

F

REF

FB

R

F

R

C

FB

FB

R

B

R

A

FB

REF

V

A

V

C

REF

V

H

REF

R

H

FB

I

C

I

F

NC

NC = NO CONNECT

OUT1

I

C

OUT2

I

B

OUT1

I

B

OUT2

OUT1

I

F

OUT2

I

G

OUT1

I

G

OUT2

AD7568 PQFP

TOP VIEW

Not to Scale

NC = NO CONNECT

NC

NC

44

1

2

64

5

21

24

23

22

18

20

19

39

38

35

34

33

37

36

3

7

8

11

12

13

9

10

40

41

42

25

28

27

26

43

31

30

29

32

15

16

17

14

TOP VIEW

(Not to Scale)

AD7568 PLCC

GENERAL DESCRIPTION

The AD7568 contains eight 12-bit DACs in one monolithic de-

The AD7568 is a serial input device. Data is loaded using

FSIN

, CLKIN and SDIN. One address pin, A0, sets up a de-

vice address, and this feature may be used to simplify device

loading in a multi-DAC environment.

All DACs can be simultaneously updated using the asynchro-

nous LDAC input and they can be cleared by asserting the

asynchronous CLR input.

The AD7568 is housed in a space-saving 44-pin plastic quad

flatpack and 44-lead PLCC.

REV. B

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.