REV. 0

DAC8043A

–8–

UNIPOLAR 2-QUADRANT MULTIPLYING

The most straightforward application of the DAC8043A is in

the 2-quadrant multiplying configuration shown in Figure 19. If

the reference input signal is replaced with a fixed dc voltage

reference, the DAC output will provide a proportional dc volt-

age output according to the transfer equation:

× V

REF

where D is the decimal data loaded into the DAC register and

GND

OP77

2R

R

2R

DIGITAL INPUTS OMITTED FOR CLARITY

10pF

Figure 19. Unipolar (2-Quadrant) Operation

BIPOLAR 4-QUADRANT MULTIPLYING

Figure 20 shows a suggested circuit to achieve 4-quadrant mul-

2, and offsets the output with the reference voltage so that a

loaded with all zeros. The positive full-scale output will be

the digital coding is offset binary. The voltage output transfer

equation for various input data and reference (or signal) values

follows:

× –V

REF

where D is the decimal data loaded into the DAC register and

Precision resistors will be necessary to avoid ratio errors. Other-

wise trimming will be required to achieve full accuracy specifica-

tions available from the DAC8043A device. See the various

Analog Devices Digital Potentiometer products for automated

trimming solutions (e.g., the AD5204 for low voltage applica-

tions or the AD7376 for high voltage applications).

GND

2R

R

2R

DIGITAL INPUTS OMITTED FOR CLARITY

OP213

10k

OP213

20k

20k

10pF

Figure 20. Bipolar (4-Quadrant) Operation

8-Lead SOIC (SO-8)

0.1968 (5.00)

0.1890 (4.80)

8

5

4

1

0.2440 (6.20)

0.2284 (5.80)

PIN 1

0.1574 (4.00)

0.1497 (3.80)

0.0688 (1.75)

0.0532 (1.35)

SEATING

PLANE

0.0098 (0.25)

0.0040 (0.10)

0.0192 (0.49)

0.0138 (0.35)

0.0500

(1.27)

BSC

0.0098 (0.25)

0.0075 (0.19)

0.0500 (1.27)

0.0160 (0.41)

8°

0°

0.0196 (0.50)

0.0099 (0.25)

x 45°

8-Lead Plastic DIP (N-8)

8

14

5

0.430 (10.92)

0.348 (8.84)

0.280 (7.11)

0.240 (6.10)

PIN 1

SEATING

PLANE

0.022 (0.558)

0.014 (0.356)

0.060 (1.52)

0.015 (0.38)

0.210 (5.33)

MAX

0.130

(3.30)

MIN

0.070 (1.77)

0.045 (1.15)

0.100

(2.54)

BSC

0.160 (4.06)

0.115 (2.93)

0.325 (8.25)

0.300 (7.62)

0.015 (0.381)

0.008 (0.204)

0.195 (4.95)

0.115 (2.93)

8-Lead TSSOP (RU-8)

8

5

4

1

0.122 (3.10)

0.114 (2.90)

PIN 1

0.0256 (0.65)

BSC

SEATING

PLANE

0.006 (0.15)

0.002 (0.05)

0.0118 (0.30)

0.0075 (0.19)

0.0433

(1.10)

MAX

0.0079 (0.20)

0.0035 (0.090)

0.028 (0.70)

0.020 (0.50)

8

0

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).