AD9732

–4–

REV. A

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the AD9732 features proprietary ESD protection circuitry, permanent damage may

occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

Analog Output Current . . . . . . . . . . . . . . . . . . . . . . . . 30 mA

Internal Reference Output Current . . . . . . . . . . . . . . . 500

µA

Control Amplifier Output Current . . . . . . . . . . . . . .

±2.5 mA

Operating Temperature . . . . . . . . . . . . . . . . . –40

°C to +85°C

Storage Temperature . . . . . . . . . . . . . . . . . . –65

°C to +150°C

Maximum Junction Temperature . . . . . . . . . . . . . . . +175

°C

Lead Temperature (10 sec) Soldering . . . . . . . . . . . . +300

°C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions outside of those indicated in the operation

sections of this specification is not implied. Exposure to absolute maximum ratings

for extended periods may affect device reliability.

PIN FUNCTION DESCRIPTIONS

Pin Number

Name

Function

1

D9 (MSB)

Most significant data bit of digital input word.

2–9

D8–D1

Eight bits of 10-bit digital input word.

10

D0 (LSB)

Least significant data bit of digital input word.

11

CLOCK

TTL-compatible edge-triggered latch enable signal for on-board registers.

12, 13

NC

No internal connection to this pin. Recommend tie to ground.

14, 15, 28

+5 V supply voltage for digital circuitry.

16, 22, 27

GND

Converter Ground.

18

+5 V supply voltage for analog circuitry.

17

Connection for external reference set resistor; nominal 1.96 k

Ω. Full-scale output

19

ANALOG RETURN

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

20

Analog current output; full-scale current occurs with a digital word input of all “1s”

nominally 240

Ω.

21

Complementary analog current output; full-scale current occurs with a digital word

input of all “0s.”

23

REF IN

Normally connected to CONTROL AMP OUT (Pin 24). Direct line to DAC current

source network. Voltage changes (noise) at this point have a direct effect on the full-

scale output current of the DAC. Full-scale current output = 32 (CONTROL AMP IN/

24

CONTROL AMP OUT

Normally connected to REF IN (Pin 23). Output of internal control amplifier, which

provides a reference for the current switch network.

25

REF OUT

Normally connected to CONTROL AMP IN (Pin 26). Internal voltage reference,

nominally 3.75 V.

26

CONTROL AMP IN

Normally connected to REF OUT (Pin 25) if not connected to external reference.

PIN CONFIGURATION

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

AD9732

NC = NO CONNECT

NC

NC

CLOCK

D0 (LSB)

D1

D2

D9 (MSB)

D8

D7

D6

D3

D4

D5

GND

ANALOG RETURN

GND

CONTROL AMP IN

REF OUT

GND

REF IN

CONTROL AMP OUT