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LM4865 Power Amplifier

Steve Hall
Prodigy 10 points
Other Parts Discussed in Thread: LM4865

Hi,

We're tinkering with the LM4865 Power Amplifier IC.

So far, no real problems, it works as stated on the datasheet.

But we do notice one peculiarity -

We're driving the Volume Control input with DC derived from a 1K pot wired between +V and ground.

We can see that the DC voltage rises and falls smoothly with pot rotation, but the output level of the

amplifier appears to change in discrete steps, not a smooth continuous change.

Has anyone else experienced this, and is it normal for this IC?

Thanks for any feedback -

SBH

  • 0
    TI__Guru** 109055 points
    Hi Steve,

    Welcome to E2E and thank you for your interest in our products!

    The volume control response it's not linear, you can take a look at Figure 17 at Typical Performance Characteristic section in the D/S.
    You can also look for the DC Voltage Volume Control section in the D/S, Figure 29 shows a more detailed information for the stepped response.

    Best regards,
    Iván Salazar
    Texas Instruments