Datasheet

DAC7642, DAC7643
15
SBAS233
www.ti.com
FIGURE 6. Single-Supply Buffered Reference with V
REF
L of 50mV.
V
OUT
A
V
OUT
A Sense
V
REF
L Sense
V
REF
L
V
REF
H
V
REF
H Sense
V
OUT
B Sense
V
OUT
B
32
31
30
29
28
27
26
25
DAC7642
DAC7643
1000pF
V
OUT
V
OUT
100Ω
+2.5V
2kΩ
98kΩ
+0.050V
+V
+V
OPA2350
2200pF
1000pF
2200pF
100Ω
FIGURE 7. Integral Linearity and Differential Linearity Error
Curves for Figure 6.
FIGURE 8. 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
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
LE (LSB)DLE (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
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
LE (LSB)DLE (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
FIGURE 9. Single-Supply Buffered Reference with V
REF
L = +1.25V and V
REF
H = +2.5V.
V
OUT
A
V
OUT
A Sense
V
REF
L Sense
V
REF
L
V
REF
H
V
REF
H Sense
V
OUT
B Sense
V
OUT
B
32
31
30
29
28
27
26
25
DAC7642
DAC7643
1000pF
V
OUT
V
OUT
100Ω
+V
OPA2350
2200pF
1000pF
2200pF
+2.5V
+V
+V
+1.25V
100Ω