Datasheet

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R
1
V
EX
V
OUT
V
REF
R
1
OPA333
R
R
R R
+5V
NOTE:1%resistorsprovideadequatecommon-moderejectionatsmallground-looperrors.
OPA333
ADS1100
Load
V
I C
2
R
1
4.99kW
R
3
4.99kW
R
4
48.7kW
R
2
49.9kW
+5V
3V
REF3130
R
7
1.18kW
R
SHUNT
1W
R
6
71.5kW
R
N
56W
R
N
56W
(PGAGain=4)
FS=3.0V
StrayGround-LoopResistance
I
LOAD
OPA333
Output
R
SHUNT
Load
V+
V+
R
G
R
L
R
(2)
1
10kW
R
BIAS
+5V
zener
(1)
Twozener
biasingmethods
areshown.
(3)
MOSFETratedto
stand-offsupplyvoltage
suchasBSS84for
upto50V.
(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)
NOTES:
OPA333
OPA2333
SBOS351C – MARCH 2006 – REVISED MAY 2007
Figure 21 shows the basic configuration for a bridge
amplifier.
A low-side current shunt monitor is shown in
Figure 22 . R
N
are operational resistors used to
isolate the ADS1100 from the noise of the digital I
2
C
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.
Figure 21. Single Op Amp Bridge Amplifier
Figure 22. Low-Side Current Monitor
Figure 23. High-Side Current Monitor
10
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