7

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DAC7613

THEORY OF OPERATION

The DAC7613 is a 12-bit, voltage output Digital-to-Analog

Converter (DAC). The architecture is a classic R-2R ladder

configuration followed by an operational amplifier that serves

as a buffer. The minimum voltage output (“zero-scale”) and

maximum voltage output (“full-scale”) are set by the exter-

digital input is a 12-bit parallel word and the DAC input

register offers a readback capability. The converter can be

powered from a single +5V supply or a dual

±5V supply.

The device offers a reset function which immediately sets

the DAC output voltage and DAC register to mid-scale

status of the reset selection. See Figures 1 and 2 for the basic

operation of the DAC7613.

FIGURE 1. Basic Single-Supply Operation of the DAC7613.

FIGURE 2. Basic Dual-Supply Operation of the DAC7613.

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

DB11

DB10

DB9

DB8

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

R/W

CS

RESETSEL

RESET

LOADDAC

V

OUT

V

DD

GND

V

SS

V

REFH

NIC

V

REFL

Read/Write

Chip Select

Reset Select

Reset DAC

Load DAC Register

0V to +2.5V

DAC7613E

+5V

Data Bus

+2.5V

0.1

µF1µF

0.1

µF

+

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

DB11

DB10

DB9

DB8

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

R/W

CS

RESETSEL

RESET

LOADDAC

V

OUT

V

DD

GND

V

SS

V

REFH

NIC

V

REFL

Read/Write

Chip Select

Reset Select

Reset DAC

Load DAC Register

–2.5V to +2.5V

DAC7613E

+5V

Data Bus

–5V

0.1

µF1µF

1

µF

0.1

µF

+2.5V

0.1

µF

–2.5V

0.1

µF

+

+