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INA128: Can INA128 work with Single Power Supply of 4.3 V?

Waleed
Prodigy 90 points
Part Number: INA128
Other Parts Discussed in Thread: INA321, INA333

Hello,

My question is as the title implies. I saw several designs using INA128 with a single supply. The thing I am concerned about is the I checked the datasheet and it states dual power supply. Am I correct? Thanks

  • 0
    TI__Guru* 93105 points
    Hello Waleed,

    The INA128 is designed to be operated from a dual supply. It should be possible to power it from a single supply, but careful attention must be paid to establishing correct input common-mode voltage and reference voltage levels. Attention also be given to what the potential output swing range will be under that condition.

    When it comes to operating the INA128 with an even lower +4.3 V supply, TI cannot make any assurances about operation or performances at that supply level because it is outside the specifications. Most operational amplifiers and related INAs have some margin below their minimum specified operating voltage in which they are still functional. If you are setting up an experiment you could see if the INA128 still works under your supply condition. However, I would not recommend using the INA128 with a +4.3 V supply for any sort of production, high-volume application.

    If your application can tolerate higher input current you may want to consider a low-voltage, single-supply instrumentation amplifier. An example of one is the INA321. It is good for a +2.7 V supply on the low end.

    www.ti.com/.../sbos168d.pdf

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • 0 in reply to Thomas Kuehl
    TI__Genius 11135 points
    Waleed

    We Haven't heard back from you so we assume this answered your question. If not, post another reply below.

    Thanks
    Dennis
  • 0 in reply to Thomas Kuehl
    Prodigy 90 points

    Thanks for your response. Would you recommend me any PIDP instrumentation with high CMRR and rail to rail output? Thanks

  • 0 in reply to Waleed
    TI__Expert 6275 points
    We do not have any PDIP op amps optimized for single supply. Consider INA333 as another single supply IA.
    This link talks about Inst Amp and input common mode requirement:
    www.ti.com/.../INA-CMV-CALC
    This link shows an EVM that will convert surface mount packages to a DIP form factor:
    www.ti.com/.../DIP-ADAPTER-EVM
  • 0 in reply to Tim Green1
    TI__Genius 11135 points
    Waleed

    Did this answer your question? If not, post another reply below.

    Thanks
    Dennis