Datasheet

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V
OUT
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
DAC7634
+2.5V
+V
OPA2350
98kΩ
+0.050V
2kΩ
V
OUT
1000pF
1000pF
2200pF
+V
100Ω
2200pF
100Ω
L has been chosen to be 50 mV to allow for current sinking voltage
drops across the 100-Ω resistor and the output stage of the buffer operational amplifier.
NOTE: V
REF
LE (LSB)DLE (LSB)
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)
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
+2.5V
+V
+1.25V
+V
V
OUT
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
DAC7634
OPA2350
V
OUT
1000pF
1000pF
2200pF
+V
100Ω
100Ω
2200pF
DAC7634
SBAS134B – JULY 2004 – REVISED DECEMBER 2005
Figure 53. Single-Supply Buffered Reference With a Reference Low of 50 mV (1/2 DAC7634)
Figure 54. Integral Linearity and Differential Linearity Figure 55. Integral Linearity and Differential Linearity
Error Curves for Figure 53 Error Curves for Figure 56
Figure 56. Single-Supply Buffered Reference With V
REF
L = 1.25 V and V
REF
H = 2.5 V (1/2 DAC7634)
20