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| OPA2333AIDGKR Datasheet, PDF (10/28 Pages) Texas Instruments – 1.8V, microPOWER CMOS OPERATIONAL AMPLIFIERS Zero-Drift Series | |||
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OPA333
OPA2333
SBOS351C â MARCH 2006 â REVISED MAY 2007
Figure 21 shows the basic configuration for a bridge
amplifier.
A low-side current shunt monitor is shown in
Figure 22. RN 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 5V
power supply is sufficiently stable, the REF3130 may
be omitted.
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VEX
RR
RR
R1
+5V
OPA333
VOUT
R1
VREF
Figure 21. Single Op Amp Bridge Amplifier
Load
V
ILOAD
RSHUNT
1W
R1
4.99kW
R3
4.99kW
+5V
R2
49.9kW
OPA333
R4
48.7kW
3V
REF3130
R6
71.5kW
RN
56W
ADS1100
RN
I2C
56W
Stray Ground-Loop Resistance
R7
1.18kW
(PGA Gain = 4)
FS = 3.0V
NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors.
Figure 22. Low-Side Current Monitor
RG
RSHUNT
zener(1)
R1(2)
10kW
V+
OPA333
MOSFET rated to
stand-off 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) Current-limiting resistor.
(3) Choose zener biasing resistor or dual NMOSFETs (FDG6301N, NTJD4001N, or Si1034)
Figure 23. High-Side Current Monitor
10
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