Datasheet

REF1112
6
SBOS283C
www.ti.com
FIGURE 5. Adjustable Voltage Shunt Reference.
For applications requiring a stable voltage reference ca-
pable of sinking higher than 5mA of current, a REF1112
combined with an OPA347 can sink up to 10mA of
current. This configuration is shown in Figure 5, and
through appropriate selection of R1 and R2, can be used
to provide a wide range of stable reference voltages. The
REF1112 is also useful for level shifting, and as shown in
Figure 6, can be used to achieve the full input range of an
analog-to-digital converter (ADC).
FIGURE 6. REF1112 Provides a Level Shift to Achieve Full ADC Input Range.
I
BIAS
2.5V
1.25V
0.1µF
10kΩ
R
1
10kΩ
R
2
10kΩ
OPA347
0.01µF
V
OUT
= 1.25 (1 + R1 / R2)
V
S
R
SET
V
REF
V
IN
+V
−V
V
S
1.25V
0.1µF
ADC
V
OUT