Datasheet

DAC7734
20
SBAS138A
www.ti.com
FIGURE 9. Single-Supply Buffered Reference with a Reference Low of 50mV and Reference High of +5V.
V
OUT
A Sense
V
OUT
A
AGND
V
SS
V
REF
L AB Sense
V
REF
L AB
V
REF
H AB
V
REF
H AB Sense
V
OUT
B Sense
V
OUT
B
48
47
46
45
44
43
42
41
40
39
DAC7734
V
OUT
V
OUT
99kΩ
0.05V
1kΩ
+5V
+V
1000pF
2200pF
+V
OPA350
OPA227
100Ω
1000pF
2200pF
100Ω
NOTE: V
REF
L has been chosen to be 50mV to allow for current sinking voltage drops across the 100Ω resistor and the output stage of the buffer op amp.
50Ω
FIGURE 10. Integral Linearity and Differential Linearity Error Curves for Figure 9.
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
LE (LSB)
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(DAC A, 25°C)
0000
H
2000
H
4000
H
6000
H
8000
H
Digital Input Code
A000
H
C000
H
E000
H
FFFF
H
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
DLE (LSB)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
LE (LSB)
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(DAC B, 25°C)
0000
H
2000
H
4000
H
6000
H
8000
H
Digital Input Code
A000
H
C000
H
E000
H
FFFF
H
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
DLE (LSB)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
LE (LSB)
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(DAC C, 25°C)
0000
H
2000
H
4000
H
6000
H
8000
H
Digital Input Code
A000
H
C000
H
E000
H
FFFF
H
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
DLE (LSB)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
LE (LSB)
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(DAC D, 25°C)
0000
H
2000
H
4000
H
6000
H
8000
H
Digital Input Code
A000
H
C000
H
E000
H
FFFF
H
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
DLE (LSB)