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APPLICATION INFORMATION

V

OUT

+

D

8192 *

1

V

REF

(2)

10 V

10 kΩ

10 kΩ

5 kΩ

OPA277

One Channel

DAC8802

Digital interface connections omitted for clarity.

- 10 V <

V

OPA277

Cross-Reference

DAC8802

SBAS351A – AUGUST 2005 – REVISED DECEMBER 2005

The DAC8802, a 2-quadrant multiplying DAC, can be used to generate a unipolar output. The polarity of the

Some applications require full 4-quadrant multiplying capabilities or bipolar output swing, as shown in Figure 35.

An additional external op amp (A2) is added as a summing amp. In this circuit, the first and second amps (A1

and A2) provide a gain of 2X that widens the output span to 20 V. A 4-quadrant multiplying circuit is implemented

by using a 10-V offset of the reference voltage to bias A2. According to the following circuit transfer equation

Figure 35. Four-Quadrant Multiplying Application Circuit

The DAC8802 has an industry-standard pinout. Table 4 provides the cross-reference information.

Table 4. Cross-Reference

SPECIFIED

INL

DNL

TEMPERATURE

PACKAGE

PACKAGE

CROSS-REFERENCE

PRODUCT

(LSB)

(LSB)

RANGE

DESCRIPTION

OPTION

PART NUMBER

16-Lead Thin Shrink

DAC8802IPW

±1

±1

-40°C to +85°C

TSSOP-16

AD5555CRU

Small-Outline Package

15