REF102 Precision VOLTAGE REFERENCE
REF102 Precision VOLTAGE REFERENCE
REF102 Precision VOLTAGE REFERENCE
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V+<br />
2<br />
V+<br />
V+<br />
<strong>REF102</strong><br />
6<br />
–<br />
OPA27<br />
+<br />
+10V<br />
220Ω<br />
2<br />
2N2905<br />
2<br />
R 1<br />
= V CC<br />
– 10V<br />
4<br />
I L<br />
6<br />
<strong>REF102</strong><br />
I L<br />
+10V<br />
<strong>REF102</strong><br />
6<br />
I L<br />
I L (TYP)<br />
+10V<br />
a) –20mA < I L<br />
< +20mA<br />
(OPA27 also improves transient immunity)<br />
4<br />
b) –5mA < I L<br />
< +100mA<br />
4<br />
c) I L (MAX)<br />
= I L (TYP)<br />
+10mA<br />
I L (MIN)<br />
= I L (TYP)<br />
–5mA<br />
FIGURE 7. +10V Reference With Output Current Boosted to: a) ±20mA, b) +100mA, and c) I L (TYP) +10mA, –5A.<br />
+15V<br />
2<br />
6<br />
357Ω<br />
1/2W<br />
28mA<br />
28.5mA<br />
+5V<br />
<strong>REF102</strong><br />
350 Ω Strain<br />
Gauge Bridge<br />
4<br />
6<br />
–<br />
OPA27<br />
2<br />
R G<br />
5<br />
10<br />
–<br />
INA101<br />
+<br />
8<br />
VOUT<br />
x100<br />
+<br />
3<br />
–15V<br />
–5V<br />
357Ω<br />
1/2W<br />
FIGURE 8. Strain Gauge Conditioner for 350Ω Bridge.<br />
V+<br />
2<br />
V+<br />
2<br />
<strong>REF102</strong><br />
4<br />
6<br />
2<br />
3<br />
25kΩ<br />
25kΩ<br />
25kΩ<br />
5<br />
6<br />
+10V<br />
Out<br />
–10V<br />
Out<br />
<strong>REF102</strong><br />
4<br />
6<br />
OPA111<br />
–<br />
+<br />
R<br />
I OUT<br />
LOAD<br />
25kΩ<br />
1<br />
See AB-005 for more details.<br />
INA105<br />
I OUT<br />
= 10V , R ≥ 1kΩ<br />
R<br />
See AB-002 for more details and I Sink Circuit.<br />
Can be connected<br />
to ground or –V . S<br />
FIGURE 9. ±10V Reference.<br />
FIGURE 10. Positive <strong>Precision</strong> Current Source.<br />
®<br />
<strong>REF102</strong><br />
8
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