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OPA189IDBVT Datasheet(PDF) 31 Page - Texas Instruments

Part # OPA189IDBVT
Description  OPAx189 Precision, Lowest-Noise, 36-V, Zero-Drift, 14-MHz, MUX-Friendly, Rail-to-Rail Output Operational Amplifiers
PDF  58 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

OPA189IDBVT Datasheet(HTML) 31 Page - Texas Instruments

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9.2.3 Bridge Amplifier
Figure 9-4 shows the basic configuration for a bridge amplifier. Click the following link to download the TINA-TI
software file: Bridge Amplifier Circuit.
VEX
R
R
R
R
R1
VREF
VOUT
+5V
Copyright © 2017, Texas Instruments Incorporated
Figure 9-4. Bridge Amplifier
9.2.4 Low-Side Current Monitor
Figure 9-5 shows the OPAx189 configured in a low-side current-sensing application. The load current (ILOAD)
creates a voltage drop across the shunt resistor (RSHUNT). This voltage is amplified by the OPAx189, with a gain
of 201. In this example the load current is set from 0 A to 500 mA, which corresponds to an output voltage range
from 0 V to 10 V. The output range can be adjusted by changing the shunt resistor or gain of the configuration.
Click the following link to download the TINA-TI software file: Current-Sensing Circuit.
RIN
RF
RSHUNT
100 m
Load
ILOAD
VOUT
VOUT = ILOAD * RSHUNT(1 + RF / RIN)
VOUT / ILOAD= 1 V / 49.75 mA
100
20 k
CF
150
pF
+
±
OPAx189
15 V
V
SYSTEM
Copyright © 2017, Texas Instruments Incorporated
Figure 9-5. Low-Side Current Monitor
www.ti.com
OPA189, OPA2189, OPA4189
SBOS830I – SEPTEMBER 2017 – REVISED OCTOBER 2021
Copyright © 2021 Texas Instruments Incorporated
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Product Folder Links: OPA189 OPA2189 OPA4189



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