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Find OP like INA159

Nat Wong
Genius 3070 points
Other Parts Discussed in Thread: INA159, INA326

Dear Sirs

I want to find OP like INA159 (Precision, Gain of 0.2 Level Translation

DIFFERENCE AMPLIFIER). 

But I want to find bigger input impedance OP with small size ( 4 OPAs package), high precision attenuated.

INA159 don't have high impedance (>500Mohm), it just have 600K.

Could you help me

Thanks

BRS

Nat

  • 0
    TI__Mastermind 25815 points

    Hello Nat,

    For large input impedance you will need either op amps or instrumentation amplifiers. The only TI instrumentation amplifier that is capable of a gain less than one is the INA326. Please be aware, however, that the input common-mode voltage is determined by the supply voltage when it comes to instrumentation amplifiers. Difference amplifiers like the INA159 have resistor dividers on the input which allow for larger common-mode voltages, but have lower input impedance as you noted. The INA326 does not come in a dual or quad package. Of course we have many op amps that come in quad packages. If you're interested in quad op amps, please take a look at the following selection tool:

    www.ti.com/.../opamps-selguide

    Hope this helps!