5

®

DAC707/708/709

DESCRIPTION OF PIN FUNCTIONS

DAC707

Pin

DAC708/709

DESIGNATOR

DESCRIPTION

#

DESIGNATOR

DESCRIPTION

Voltage output for DAC707 (

±10V)

1

Latch enable for D/A latch (Active low)

Logic supply (+5V)

2

Latch enable for “low byte” input (Active low). When

selected and the serial input is enabled.

DCOM

Digital common

3

Latch enable for “high byte” input (Active low). When

selected and the serial input is enabled.

ACOM

Analog common

4

D7 (D15)

Input for data bit 7 if enabling low byte (LB) latch or

data bit 15 if enabling the high byte (HB) latch.

SJ

Summing junction of the internal output op amp for the

5

D6 (D14)

Input for data bit 6 if enabling LB latch or data bit 14 if

DAC707. Offset adjust circuit is connected to the

enabling the HB latch.

summing junction of the output amplifier. Refer to Block

Diagram.

GA

Gain adjust pin. Refer to Connection Diagram for gain

6

D5 (D13)

Data bit 5 (LB) or data bit 13 (HB)

adjust circuit.

Positive supply voltage (+15V)

7

D4 (D12)

Data bit 4 (LB) or data bit 12 (HB)

Negative supply voltage (–15V)

8

D3 (D11)

Data bit 3 (LB) or data bit 11 (HB)

CLR

Clear line. Sets the input latch to zero and sets the D/A

9

D2 (D10)

Data bit 2 (LB) or data bit 10 (HB)

latch to the input code that gives bipolar zero on the

D/A output (Active low)

WR

Write control line (Active low)

10

D1 (D9)

Data bit 1 (LB) or data bit 9 (HB)

Enable for D/A converter latch (Active low)

11

D0 (D8)/SI

Data bit 0 (LB) or data bit 8 (HB). Serial input when

serial mode is selected.

Enable for input latch (Active low)

12

DCOM

Digital common

D15 (MSB)

Data bit 15 (Most Significant Bit)

13

Feedback resistor for internal or external operational

amplifier. Connect to pin 14 when a 10V output range

is desired. Leave open for a 20V output range.

D14

Data bit 14

14

Voltage output for DAC709 or feedback resistor for

use with an external output op amp for the DAC708.

Refer to Connection Diagram for connection of

external op amp to DAC708.

D13

Data bit 13

15

ACOM

Analog common

D12

Data bit 12

16

SJ (DAC709)

Summing junction of the internal output op amp for the

DAC709, or the current output for the DAC708. Refer

to Connection Diagram for connection of external op

amp to DAC708.

D11

Data bit 11

17

BPO

Bipolar offset. Connect to pin 16 when operating in the

bipolar mode. Leave open for unipolar mode.

D10

Data bit 10

18

GA

Gain adjust pin

D9

Data bit 9

19

Positive supply voltage (+15V)

D8

Data bit 8

20

Negative supply voltage (–15V)

D7

Data bit 7

21

CLR

Clear line. Sets the high and low byte input registers

to zero and, for bipolar operation, sets the D/A register

to the input code that gives bipolar zero on the D/A

output. (In the unipolar mode, invert the MSB prior to

the D/A.)

D6

Data bit 6

22

WR

Write control line

D5

Data bit 5

23

CS

Chip select control line

D4

Data bit 4

24

Logic supply (+5V)

D3

Data bit 3

25

No pin

D2

Data bit 2

26

No pin

(The DAC708 and DAC709 are in 24-pin packages)

D1

Data bit 1

27

No pin

D0 (LSB)

Data bit 0 (Least Significant Bit)

28

No pin