7

®

DAC716

FIGURE 1. DAC716 Block Diagram.

FIGURE 2. Equivalent Circuit of Digital Inputs.

FIGURE 3. Relationship of Offset and Gain Adjustments.

Gain Adjustment

Apply the digital input that gives the maximum positive

voltage output. Adjust the gain potentiometer or the gain

adjust D/A converter for this positive full scale voltage.

GAIN AND OFFSET ADJUSTMENTS

Figure 3 illustrates the relationship of offset and gain adjust-

ments for a unipolar connected D/A converter. Offset should

be adjusted first to avoid interaction of adjustments. See

Table I for calibration values and codes. These adjustments

have a minimum range of

±0.3%.

Offset Adjustment

Apply the digital input code, 0000, that produces 0V and adjust

the offset potentiometer or the offset adjust D/A converter for

0V.

Shift Register

DAC Latch

14

12

+10V

Reference

8

6

7

DCOM

+V

CC

ACOM

V

REF OUT

Gain Adjust

4

SDI

5

SDO

16

2

A

0

3

A

1

1

16

CLK

CLR

15

– V

CC

Offset

Adjust

13

NC

11

NC

10

9

V

OUT

D/A Switches

–V

CC

+2.5V

15k

Ω

180

Ω

9.75k

Ω

5k

Ω

R

R = 1k

Ω: A

ESD Protection Circuit

6.8V

5pF

Digital

Input

–V

CC

+V

CC

1LSB

Range of

Offset Adjust

Offset Adj.

Translates

the Line

Digital Input

FFFF

H

8000

H

0000

H

Full Scale

Range

Gain Adjust

Rotates the Line

Zero

Range of

Gain Adjust

≈ ±0.3%

≈ ±0.3%

+ Full Scale