DAC7741Y Burr-Brown Corporation, DAC7741Y Datasheet - Page 12

• Manufacturer Part Number: DAC7741Y
• Description: 16-Bit/ Single Channel DIGITAL-TO-ANALOG CONVERTER With Internal Reference and Parallel Interface
• Manufacturer: Burr-Brown Corporation

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.
FIGURE 1. DAC7741 Architecture.
FIGURE 2. Basic Operation: V
12
0.1 F
2R
V
DD
Control Bus
2R
1 F
R
2R
0.1 F
OUT
V
CC
V
0.1 F
= 0 to +10V.
SS
2R
DGND
V
RST
LDAC
CS
R/W
RSTSEL
REFEN
REF
REFADJ
REF
NC
DD
1 F
OUT
IN
REF
1 F
+10V Internal
2R
ADJ
Reference
REF
2R
OUT
Data Bus
DAC7741
2R
www.ti.com
REF
IN
2R
Buffer
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
to 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
0000
functions are discussed in more detail in the following sec-
tions.
R/2
H
2R
) or mid-scale (code 8000
V
REF
R/2
R/4
V
AGND
REF
DB6
DB5
DB4
DB3
DB2
DB1
DB0
NC
NC
NC
NC
NC
R/4
R/4
(0V to +10V)
Data Bus
H
). The data I/O and reset
R
RFB2
RFB1
SJ
V
OFFSET
OUT
DAC7741
SBAS248A
12V