OPA333A-EP_09 Datasheet, PDF (11/19 Pages) Texas Instruments – 1.8-V MICROPOWER CMOS OPERATIONAL AMPLIFIERS ZERO-DRIFT SERIES

OPA333A-EP, OPA2333A-EP
www.ti.com ............................................................................................................................................................ SGLS383B – APRIL 2007 – REVISED JUNE 2008
Load
V
I_LOAD
R_SHUNT
1Ω
R₁
4.99kΩ
R₃
4.99kΩ
+5V
R₂
49.9kΩ
OPA333A
R₄
48.7kΩ
3V
REF3130
R₆
71.5kΩ
R_N
56Ω
ADS1100
R_N
I²C
56Ω
Stray Ground−Loop Resistance
R₇
1.18kΩ
(PGA Gain = 4)
FS = 3.0V
NOTE: 1% resistors provide adequate common−mode rejection at small ground−loop errors.
Figure 5. Low-Side Current Monitor
R_G
R_SHUNT
zener⁽¹⁾
R₁₍₂₎
10kΩ
V+
OPA333A
MOSFET rated to
stand−off supply voltage
such as BSS84 for
up to 50V.
+5V
V+
Two zener
biasing methods
are shown.⁽³⁾
Load
R_BIAS
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
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