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OPA333-Q1 Datasheet, PDF (11/18 Pages) Texas Instruments – 1.8-V MICROPOWER CMOS OPERATIONAL AMPLIFIER ZERO-DRIFT SERIES | |||
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www.ti.com
OPA333-Q1
SBOS522 â JUNE 2010
Load
V
ILOAD
RSHUNT
1â¦
R1
4.99kâ¦
R3
4.99kâ¦
+5V
R2
49.9kâ¦
OPA333A
R4
48.7kâ¦
3V
REF3130
R6
71.5kâ¦
RN
56â¦
ADS1100
RN
I2C
56â¦
Stray GroundâLoop Resistance
R7
1.18kâ¦
(PGA Gain = 4)
FS = 3.0V
NOTE: 1% resistors provide adequate commonâmode rejection at small groundâloop errors.
Figure 5. Low-Side Current Monitor
RG
RSHUNT
zener(1)
R1(2)
10kâ¦
V+
OPA333A
MOSFET rated to
standâoff supply voltage
such as BSS84 for
up to 50V.
+5V
V+
Two zener
biasing methods
are shown.(3)
Load
RBIAS
Output
RL
NOTES: (1) zener rated for op amp supply capability (that is, 5.1V for OPA333).
(2) Currentâlimiting resistor.
(3) Choose zener biasing resistor or dual NMOSFETS (FDG6301N, NTJD4001N, or Si1034)
Figure 6. High-Side Current Monitor
Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): OPA333-Q1
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