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Quiescent current

Other Parts Discussed in Thread: OPA861, TLE2426

Hello,

I'm a little bit confused about the quiescent current of the OPA861.

Im my application, I'm using the OPA861 in a single supply configuration with 6.6V DC.

I'm also using a TLE2426 as a Vbias to improve the distortion.

From the data sheet, I understood that there is a built in 250 Ohm resistor, If that is correct, I should be able to connect the OPA861 Pin 1 driectly to GND ?

But I plan to use an external 47 Ohm from Pin 1 to GND in order to encrease the quiescent current and decrease THD, is it OK ?

Last one, What about using the TLE2426 as a rail splitter as shown here ?

Jean

  • Hello Jean,

    Like you mentioned there is a built in 250 ohm resistor that can be used by connecting pin 1 directly to GND. You can also set your own resistor, however the datasheet recommends keeping this value between 50-ohms and 1kohm to maintain optimal performance of the part. So while it is ok to add an external resistor, you may want to use 50-ohms. I don't see an issue with using a TLE2426 as long as you don't exceed the 20-mA output current that the part can provide.

    Best,

    Hasan Babiker

  • Thank you Hasan,

    Well, it is still confusing as should I tie pin 1 to ground it is the same as a zero Ohm resistor between pin 1 and ground that is lower than 50 Ohm...

    I don't really see the point, sorry.

    Jean

  • Hello Jean,

    If the negative supply is tied directly to pin 1, the quiescent current will be set by an internal 250 ohm resistor.

    Best,

    Hasan Babiker