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PGA870: Minimum frequency response

Gangeshan Divakaran
Prodigy 60 points
Part Number: PGA870

Hi Ti Community

Is there a minimum frequency response for PGA870.

Can it be used in audio applications in the frequency range 100Hz to 3kHz.

If not are there any fully differential PGA or VGA that is suitable for audio applications.

Thanks

Diva

  • 0
    Guru 140200 points

    Hi Diva,

    this sort of HF PGAs are optimized (regarding stability, noise, bandwidth, etc.) for very low source and load resistances. And the input resistance of the PGA870 is also very low (<= 150 Ohm). Such a HF PGA is standardly not used for audio purposes. See also figure 31, which demonstrates that the PGA870 brings a rather high noise at very low frequencies.

    PGAs suited for low frequencies can be found here:

    www.ti.com/.../products.html

    Kai