OPA333 Datasheet, PDF (10/18 Pages) Burr-Brown (TI) – 1.8V, microPOWER CMOS OPERATIONAL AMPLIFIERS Zer-PI Drift Series

OPA333
OPA2333
SBOS351 − MARCH 2006
V+
R_SHUNT
R_G
zener⁽¹⁾
R₁₍₂₎
10kΩ
V+
OPA333
www.ti.com
MOSFET rated to
stand−off supply voltage
such as BSS84 for
up to 50V.
Load
Two zener
biasing methods
are shown.⁽³⁾
R_BIAS
+5V
Output
R_L
Notes:
(1) zener rated for op amp supply capability (that is, 5.1V for OPA333).
(2) Current−limiting resistor.
(3) Choose zener biasing resistor or dual NMOSFETS (FDG6301N, NTJD4001N, or Si1034)
Figure 6. High-Side Current Monitor
1MΩ
3V
1MΩ
60kΩ
100kΩ
NTC
Thermistor ^OPA333
Figure 7. Thermistor Measurement
V₁
−In
OPA333
INA152
2
5
R₂
R₁
R₂
6
V_O
3
1
OPA333
V₂
+In
V_O = (1 + 2R₂/R₁) (V₂ − V₁)
Figure 8. Precision Instrumentation Amplifier
10