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INA190 Scheda tecnica(PDF) 17 Page - Texas Instruments

Il numero della parte INA190
Spiegazioni elettronici  INA190 Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range, Precision Current-Sense Amplifier With Enable
PDF  48 Pages
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Produttore elettronici  TI2 [Texas Instruments]
Homepage  https://www.ti.com
Logo TI2 - Texas Instruments

INA190 Scheda tecnica(HTML) 17 Page - Texas Instruments

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+ 1.8 V
IN-
IN+
VS
OUT
+
±
-3.3 V
RSENS E
Capacitive ly
Couple d
Amplifier
ENABL E
INA190
REF
GND
- 3.3 V
ADC
CBYPASS
0.1 µF
Loa d
17
INA190
www.ti.com
SBOS863D – MARCH 2018 – REVISED NOVEMBER 2019
Product Folder Links: INA190
Submit Documentation Feedback
Copyright © 2018–2019, Texas Instruments Incorporated
Device Functional Modes (continued)
Another use for the REF pin in unidirectional operation is to level shift the output voltage. Figure 36 shows an
application where the device ground is set to a negative voltage so currents biased to negative supplies, as seen
in optical networking cards, can be measured. The GND of the INA190 can be set to negative voltages, as long
as the inputs do not violate the common-mode range specification and the voltage difference between VS and
GND does not exceed 5.5 V. In this example, the output of the INA190 is fed into a positive-biased ADC. By
grounding the REF pin, the voltages at the output will be positive and not damage the ADC. To make sure the
output voltage never goes negative, the supply sequencing must be the positive supply first, followed by the
negative supply.
Figure 36. Using the REF Pin to Level-Shift Output Voltage



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