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TL074 noise

Anders Lundgren
Prodigy 20 points
Other Parts Discussed in Thread: TL074, TL084

Hi,

We're using TL084CD in an application but need to have a less noisy solution.

The first thing that came to my mind was to use the pin compatible TL074 since "The TL07x series are the low-noise versions of the TL08x series amplifiers". However, when I read the datasheet I find the same noise figures for both products (Equivalent input noise voltage and Equivalent input noise current).

In what way is the TL074 less noisy than TL084?

Also, we have found that TL084QD is much noiser than TL084CD and got the answer that the two devices use different silicon dies.

Does the silicon die differ between TL074C and TL74Q as well?

If so, can we expect a similar difference in noise as in the TL084 case (based on similar differences in the chip design)?

Regards


Anders

  • 0
    Genius 3295 points

    Hi Anders,

    To answer directly, you don't mention whether you have a cost constraint or whether it must be a DIP package or if an SMD is okay. This device, from a noise prospective is better than the other devices mentioned: http://www.ti.com/product/opa1604

    That being said, is it the device noise itself that is too high, or are there other considerations that may allow you to use this device such as lowering the supply rail noise, proper filtering, etc.?

    Mike T.

  • 0
    TI__Guru**** 157036 points
    Anders,

    Yes, TL074 temperature grade can result in different dies.
    I believe TL074 gets noise screening at wafer level so it is recommended for low noise applications.

    Passive resistors also have noise so be sure to calculate the noise from them.