OPA2333-HT Datasheet, PDF (14/23 Pages) Texas Instruments – 1.8-V MICROPOWER CMOS OPERATIONAL AMPLIFIER ZERO-DRIFT SERIES

OPA2333-HT
SBOS483F – JULY 2009 – REVISED AUGUST 2012
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Load
V
I_LOAD
R_SHUNT
1Ω
R₁
4.99kΩ
R₃
4.99kΩ
+5V
R₂
49.9kΩ
OPA2333
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.
A. REF3130 and ADS1100 have not been characterized or tested at 210°C.
Figure 6. Low-Side Current Monitor
R_G
R _SHUNT
ze ne r⁽¹⁾
R
(2)
1
10kΩ
V+
OPA2333
MOS F E T rated to
stand−off supply voltage.
+5V
V+
Two zener
biasing methods
are shown.⁽³⁾
L oad
R _BIAS
Output
R_L
NOTE S : (1) zener rated for op amp supply capability (that is, 5.1V for OPA2333).
(2) C urrent−limiting resistor.
(3) C hoose zener biasing resistor or dual NMOS F E TS
Figure 7. High-Side Current Monitor
14
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