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| OPA4317 Datasheet, PDF (11/30 Pages) Texas Instruments – Low-Offset, Rail-to-Rail I/O Operational Amplifier | |||
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www.ti.com
OPA317
OPA2317
OPA4317
SBOS682A â MAY 2013 â REVISED JUNE 2013
APPLICATION CIRCUITS
Figure 21 shows the basic configuration for a bridge amplifier. A low-side current shunt monitor is shown in
Figure 22.
VEX
R1
RR
RR
+5 V
Device
VOUT
R1
VREF
Figure 21. Single Op Amp Bridge Amplifier
Load
V
ILOAD
RSHUNT
1W
R1
4.99 kW
R3
4.99 kW
+5 V
R2
49.9 kW
Device
R4
48.7 kW
3V
REF3130
R6
71.5 kW
RN
56 W
ADS1100
RN
I2C
56 W
Stray Ground-Loop Resistance
R7
1.18 kW
(PGA Gain = 4)
FS = 3.0 V
NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors.
Figure 22. Low-Side Current Monitor
RN are operational resistors used to isolate the ADS1100 from the noise of the digital I2C bus. The ADS1100 is a
16-bit converter; therefore, a precise reference is essential for maximum accuracy. If absolute accuracy is not
required and the 5-V power supply is sufficiently stable, the REF3130 may be omitted.
Figure 23 shows the OPA317 in a typical thermistor circuit.
1 MW
60 kW
100 kW
3V
1 MW
NTC
Thermistor Device
Figure 23. Thermistor Measurement
Copyright © 2013, Texas Instruments Incorporated
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Product Folder Links: OPA317 OPA2317 OPA4317
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