AD9712B/AD9713B

REV. B

–4–

PIN DESCRIPTIONS

Pin #

Name

Function

1–10

Ten bits of twelve-bit digital input word.

11

Least Significant Bit (LSB) of digital input word.

Input Coding vs. Current Output

1111111111

–20.475

0

0000000000

0

–20.475

12

One of two negative digital supply pins; nominally –5.2 V.

13

ANALOG RETURN

Analog ground return. This point and the reference side of the DAC load resistors should be

connected to the same potential (nominally ground).

14

Analog current output; full-scale output occurs with digital inputs at all “1.”

15

One of two negative analog supply pins; nominally –5.2 V.

16

Complementary analog current output; zero scale output occurs with digital inputs at all “1.”

17

REFERENCE IN

Normally connected to CONTROL AMP OUT (Pin 18). Direct line to DAC current source

network. Voltage changes at this point have a direct effect on the full-scale output value of

18

CONTROL AMP OUT

Normally connected to REFERENCE INPUT (Pin 17). Output of internal control amplifier,

which provides a temperature-compensated drive level to the current switch network.

19

CONTROL AMP IN

Normally connected to REFERENCE OUT (Pin 20) if not connected to external reference.

20

REFERENCE OUT

Normally connected to CONTROL AMP IN (Pin 19). Internal voltage reference, nominally

–1.18 V.

21

One of two negative digital supply pins; nominally –5.2 V.

22

REFERENCE GROUND

Ground return for the internal voltage reference and amplifier.

23

Positive digital supply pin, used only on the AD9713B; nominally +5 V. No connection to this

pin on AD9712B.

24

Connection for external resistance reference. Full-scale current out = 128 (Reference voltage/

Ω.

25

One of two negative analog supply pins; nominally –5.2 V.

26

LATCH ENABLE

Transparent latch control line. Register is transparent when LATCH ENABLE is LOW.

27

DIGITAL GROUND

Digital ground return.

28

Most Significant Bit (MSB) of digital input word.

PIN CONFIGURATIONS

PLCC/LCC

REFERENCE

GROUND

REFERENCE

OUT

CONTROL

AMP IN

AD9712B

AD9713B

(Not to Scale)

TOP VIEW

5

6

7

8

9

10

11

28

27

26

1

2

3

4

25

24

23

22

21

20

19

12

13

14 15 16

17

18

D

(LSB)

12

DIP

ANALOG RETURN

DIGITAL GROUND

LATCH ENABLE

REFERENCE GROUND

REFERENCE OUT

CONTROL AMP IN

I OUT

REFERENCE IN

CONTROL AMP OUT

1

2

3

7

28

27

26

22

8

9

10

21

20

19

11

12

18

17

4

5

25

24

6

23

TOP VIEW

(Not to Scale)

13

14

16

15

AD9712B

AD9713B