Datasheet

Data Sheet ADR130
Rev. C | Page 13 of 16
APPLICATION NOTES
BASIC VOLTAGE REFERENCE CONNECTION
The circuits in Figure 32 and Figure 33 illustrate the basic
configuration for the ADR130 voltage reference.
1
2
3
6
5
4
NC
GND
V
IN
V
OUT
SET
NC
INPUT OUTPUT
ADR130
0.1µF
0.1µF
06322-032
Figure 32. Basic Configuration, V
OUT
= 0.5 V
1
2
3
6
5
4
NC
GND
V
IN
V
OUT
SET
NC
INPUT OUTPUT
ADR130
0.1µF
0.1µF
06322-033
Figure 33. Basic Configuration, V
OUT
= 1 V
STACKING REFERENCE ICs FOR ARBITRARY
OUTPUTS
Some applications may require two reference voltage sources
that are a combined sum of the standard outputs. Figure 34 and
Figure 35 show how these stacked output references can be
implemented.
1
2
3
6
5
4
NC
GND
V
IN
V
OUT
SET
NC
0.1µF
06322-034
1
2
3
6
5
4
NC
GND
V
IN
V
OUT
SET
NC
INPUT
V
OUT1
V
OUT2
U1
ADR130
U2
ADR130
0.1µF
0.1µF
0.2
µF
Figure 34. Stacking References with ADR130, V
OUT1
= 1.0 V, V
OUT2
= 2.0 V
1
2
3
6
5
4
NC
GND
V
IN
V
OUT
SET
NC
0.1µF
06322-035
1
2
3
6
5
4
NC
GND
V
IN
V
OUT
SET
NC
INPUT
V
OUT1
V
OUT2
U1
ADR130
U2
ADR130
0.1
µF
0.1µF
0.2µF
Figure 35. Stacking References with ADR130, V
OUT1
= 0.5 V. V
OUT2
= 1.5 V
Two reference ICs are used and fed from an unregulated input,
V
IN
. The outputs of the individual ICs that are connected in
series provide two output voltages, V
OUT1
and V
OUT2
. V
OUT1
is the
terminal voltage of U1, and V
OUT2
is the sum of this voltage and
the terminal voltage of U2. U1 and U2 are chosen for the two
voltages that supply the required outputs (see Table 5). For
example, if U1 is set to have an output of 1 V or 0.5 V, the user
can stack on top of U2 to get an output of 2 V or 1.5 V.
Table 5. Required Outputs
U1/U2 Comments V
OUT1
V
OUT2
ADR130/ADR130 See Figure 34 1 V 2 V
ADR130/ADR130 See Figure 35 0.5 V 1.5 V