®

DAC2813

4

TIMING DIAGRAMS

PIN

NAME

FUNCTION

1

DB11

DATA, MSB, positive true.

2

DB10

DATA

3

DB9

DATA

4

DB8

DATA

5

DB7

DATA

6

DB6

DATA

7

DB5

DATA

8

DB4

DATA

9

DB3

DATA

10

DB2

DATA

11

DB1

DATA

12

DB0

DATA, LSB.

13

RESET

Resets output of all D/As to bipolar-zero. The D/A remains in this state until overwritten an LDAC-WR command. RESET does not

reset the input latch. After power–up and reset, input latches will be in an indeterminant state.

14

WR

Write strobe. Must be low for data transfer to any latch (except RESET).

15

EN2

Enable for 12-bit input data latch of D/A 2. NOTE: This logic path is slower than the WR\ path.

16

EN1

Enable for 12-bit input data latch of D/A 1. NOTE: This logic path is slower than the WR\ path.

17

LDAC

Load DAC enable. Must be low with WR for data transfer to the D/A latch and simultaneous update of both D/A converters.

18

DCOM

Digital common, logic currents return.

19

Analog supply input, nominally –12V or –15V referred to ACOM.

20

Analog supply input, nominally +12V or +15V referred to ACOM.

21

+10V reference output.

22

ACOM

23

BPO2

24

BPO1

25

26

27

D/A 2 analog output.

28

D/A 1 analog output.

PIN DESCRIPTIONS

TRUTH TABLE

WR

EN1

EN2

LDAC RESET OPERATION

XXXX

0

Reset both D/A Latches. Does

not reset input latches.

1

X

X

X

1

No Operation

X

1

1

1

1

No Operation

0101

1

Load Data into First Rank for D/A 2

0011

1

Load Data into First Rank for D/A 1

0110

1

Load Second Rank from First

Rank, both D/As

0000

1

All Latches Transparent

“X” = Don’t Care

> 5ns

> 50ns

> 50ns

(Load first rank from Data Bus: LDAC = 1)

DB11–DB0

WR

> 50ns

WRITE CYCLE #1

EN

X

±1/2LSB

Reset

> 50ns

+10V

–10V

0V

t

SETTLING

V

OUT

RESET COMMAND (Bipolar Mode)

EN

±1/2LSB

LDAC

WR

> 50ns

> 50ns

WRITE CYCLE #2

(Load second rank from first rank: EN

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes

no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change

without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant

any BURR-BROWN product for use in life support devices and/or systems.