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APPLICATION INFORMATION

V

OUT

+

D

32, 768 *

1

V

REF

(2)

10 V

10 kW

10 kW

5 kW

A1

A2

One Channel

DAC8814

Digital Interface Connections Omitted For Clarity.

Cross-Reference

DAC8814

SBAS338 – JANUARY 2005

The DAC8814, 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 59.

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 59. Four-Quadrant Multiplying Application Circuit

The DAC8814 has an industry-standard pinout. Table 4 provides the cross-reference information.

Table 4. Cross-Reference

SPECIFIED

TEMPERATURE

PACKAGE

PACKAGE

CROSS-

PRODUCT

INL (LSB)

DNL (LSB)

RANGE

DESCRIPTION

OPTION

REFERENCE PART

DAC8814ICDB

±1

±1

-40

°C to +85°C

28-Lead MicroSOIC

SSOP-28

N/A

DAC8814IBDB

±4

±1.5

-40

°C to +85°C

28-Lead MicroSOIC

SSOP-28

AD5544RS

28