DAC7641Y Burr-Brown Corporation, DAC7641Y Datasheet - Page 16

• Manufacturer Part Number: DAC7641Y
• Description: 16-Bit/ Voltage Output DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: Burr-Brown Corporation

FIGURE 12. Low Cost Single-Supply Configuration.
DIGITAL INTERFACE
Table I shows the basic control logic for the DAC7641. Note
that the internal register is edge triggered and not level
triggered. When the LDAC signal is transitioned to HIGH,
the digital word currently in the register is latched.
The double-buffered architecture is designed so that the
DAC input register can be written to at any time.
TABLE I. DAC7641 Logic Truth Table.
R/W
H
X
X
X
X
L
CS
H
H
X
X
L
L
RST RSTSEL LDAC REGISTER
H
H
H
H
®
DAC7641
X
X
X
X
H
L
DAC7641
X
X
H
X
X
V
OUT
Write
Read
Hold
Hold
Sense
V
OUT
24
23
22
Reset to Midscale Reset to Midscale
Reset to Zero
REGISTER
V
Write
Hold
Hold
Hold
SS
+V
Reset to Zero
Read Input
Write Input
+2.5V
Update
INPUT
MODE
V
Hold
OUT
16
FIGURE 13. Linearity and Differential Linearity Error Curves
DIGITAL TIMING
Figure 14 and Table II provide detailed timing for the digital
interface of the DAC7641.
DIGITAL INPUT CODING
The DAC7641 input data is in Straight Binary format. The
output voltage is given by Equation 1.
where N is the digital input code. This equation does not
include the effects of offset (zero-scale) or gain (full-scale)
errors.
–0.5
–1.0
–1.5
–0.5
–1.0
–1.5
–2.0
2.5
2.0
1.5
1.0
0.5
2.0
1.5
1.0
0.5
0
0
0000
V
H
OUT
for Figure 12.
2000
DIFFERENTIAL LINEARITY ERROR vs CODE
H
V
4000
REF
LINEARITY ERROR AND
H
L
6000
Digital Input Code
H
V
(+25 C)
REF
8000
H V
H
65 536
–
A000
,
REF
H
C000
L
•
H
N
E000
H
FFFF
(1)
H