DAC7741YCSLASH2K datasheet(12/23 Pages) TI1

12 / 23 page

DAC7741

SBAS248B

www.ti.com

THEORY OF OPERATION

The DAC7741 is a voltage output, 16-bit DAC with a +10V

built-in internal reference. The architecture is an R-2R ladder

configuration with the three MSBs segmented, followed by

an operational amplifier that serves as a buffer. The output

buffer is designed to allow user-configurable output adjust-

ments, giving the DAC7741 output voltage ranges of 0V to

+10V, –5V to +5V, or –10V to +10V. Please refer to

Figures 2, 3, and 4 for pin configuration information.

The digital input is a parallel word made up of the 16-bit DAC

code, which is then loaded into the DAC register using the

LDAC input pin. The converter can be powered from

±12V

±15V dual analog supplies and a +5V logic supply. The

device offers a reset function, which immediately sets the

DAC output voltage and DAC register to min-scale (code

0000H) or mid-scale (code 8000H). The data I/O and reset

functions are discussed in more detail in the following sec-

tions.

FIGURE 1. DAC7741 Architecture.

FIGURE 2. Basic Operation: VOUT = 0 to +10V.

R/4

R/2

R/4

OFFSET

RFB2

RFB1

OUT

REF

AGND

REF

ADJ

REF

OUT

+10V Internal

Reference

Buffer

µF

0.1

µF

0.1

µF

0.1

µF

Control Bus

Data Bus

DGND

RST

LDAC

R/W

RSTSEL

REFEN

REF

OUT

REFADJ

REF

DB6

DB5

DB4

DB3

DB2

DB1

DB0

DAC7741

(0V to +10V)

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