OPA333_17 Datasheet, PDF (20/42 Pages) Texas Instruments – 1.8-V, microPower, CMOS Operational Amplifiers, Zero-Drift Series

OPA333, OPA2333
SBOS351E – MARCH 2006 – REVISED DECEMBER 2015
8.3 System Examples
8.3.1 Temperature Measurement Application
Figure 27 shows a temperature measurement application.
+5 V
+
0.1 mF
REF3140
D1
--
4.096 V
R₁
6.04 kW
R₅
31.6 kW
R₂
2.94 kW
R₂
549 W
R₉
150 kW
+5 V
0.1 mF
++
R₆
OPA333
V_O
K-Type
Thermocouple
40.7 mV/°C
R₄
6.04 kW
200 W
R₃
60.4 W
Zero
Adjust
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Figure 27. Temperature Measurementf
8.3.2 Single Operational Amplifier Bridge Amplifier Application
Figure 28 shows the basic configuration for a bridge amplifier.
V_EX
R₁
RR
RR
+5 V
OPA333
V_OUT
R₁
V_REF
Figure 28. Single Operational Amplifier Bridge Amplifier
8.3.3 Low-Side Current Monitor Application
A low-side current shunt monitor is shown in Figure 29. R_N are operational resistors used to isolate the ADS1100
from the noise of the digital I²C 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.
Load
V
I_LOAD
R_SHUNT
1W
R₁
4.99 kW
R₃
4.99 kW
+5 V
R₂
49.9 kW
OPA333
R₄
48.7 kW
3V
REF3130
R₆
71.5 kW
R_N
56 W
ADS1100
R_N
I²C
56 W
Stray Ground-Loop Resistance
R₇
1.18 kW
(PGA Gain = 4)
FS = 3.0 V
NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors.
Figure 29. Low-Side Current Monitor
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