OPA333A-EP Datasheet, PDF (10/19 Pages) Texas Instruments – 1.8-V MICROPOWER CMOS OPERATIONAL AMPLIFIERS ZERO-DRIFT SERIES

OPA333A-EP, OPA2333A-EP
SGLS383B – APRIL 2007 – REVISED JUNE 2008 ............................................................................................................................................................ www.ti.com
+5V
+
0.1µF
REF3140
D1
−−
4.096V
R₁
6.04kΩ
R₅
31.6kΩ
R₂
2.94kΩ
R₂
549Ω
R₉
150kΩ
+5V
0.1µF
++
K−Type
R₆
200Ω
O PA333A
V_O
Thermocouple
40.7µV/_ C
R₄
6.04kΩ
R₃
60.4Ω
Zero Adj.
Figure 3. Temperature Measurement
Figure 4 shows the basic configuration for a bridge amplifier.
V_EX
RR
RR
R₁
+5V
OPA333A
V_OUT
R₁
V_REF
Figure 4. Single Op-Amp Bridge Amplifier
A low-side current shunt monitor is shown in Figure 5. R_N are operational resistors used to isolate the ADS1100
from the noise of the digital I²C bus. Since the ADS1100 is a 16-bit converter, 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 may be omitted.
10
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