Datasheet

OPA333
ADS1100
Load
V
I C
2
R
1
4.99 kW
R
3
4.99 kW
R
4
48.7 kW
R
2
49.9 kW
+5 V
3 V
REF3130
R
7
1.18 kW
R
SHUNT
1 W
R
6
71.5 kW
R
N
56 W
R
N
56 W
(PGA Gain = 4)
FS = 3.0 V
Stray Ground-Loop Resistance
I
LOAD
R
1
V
EX
V
OUT
V
REF
R
1
OPA333
R
R
R R
+5 V
+ +
+
- -
+
4.096 V
0.1 Fm
+5 V
Zero
Adjust
K-Type
Thermocouple
40.7 V/ Cm °
R
2
549 W
R
9
150 kW
R
5
31.6 kW
R
1
6.04 kW
R
6
200 W
+5 V
0.1 Fm
R
2
2.94 kW
V
O
R
3
60.4 W
R
4
6.04 kW
OPA333
D1
REF3140
OPA333
OPA2333
SBOS351D –MARCH 2006–REVISED NOVEMBER 2013 www.ti.com
APPLICATION INFORMATION
Figure 20 shows a temperature measurement application
Figure 20. Temperature Measurement
Figure 21 shows the basic configuration for a bridge amplifier.
Figure 21. Single Op Amp Bridge Amplifier
A low-side current shunt monitor is shown in Figure 22. R
N
are operational resistors used to isolate the ADS1100
from the noise of the digital I
2
C bus. The ADS1100 is a 16-bit converter; therefore, a precise reference is
essential for maximum accuracy. If absolute accuracy is not required and the 5-V power supply is sufficiently
stable, the REF3130 can be omitted.
NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors.
Figure 22. Low-Side Current Monitor
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