could you please help suggest a amplifier circuits for low pass filter for audio application?

Hi Aki,

There is a wealth of information about op amp active filters on TI.com and on the web. There is also the TI Filter Designer Tool which can be applied to help the customer synthesize a low-pass filter. Here's an example of a TI Applications Report about low-pass active filter design:

https://www.ti.com/lit/an/sloa049b/sloa049b.pdf

And here's a link to the TI Filter Design tool:

https://www.ti.com/design-resources/design-tools-simulation/filter-designer.html

I used a filter design program to synthesize a 2nd-order, 400 Hz low-pass filter having a maximally flat Butterworth response. Once the circuit component values were determined I set the filter circuit up in Tina-TI to check the frequency response. You can see the resulting filter circuit and response obtained from TINA-TI here:

Using standard value passive components the cutoff frequency is 396 Hz. I set up the voltage on the TLV9052 non-inverting input so that the output voltage is centered at +2.5 V. That maximizes the linear output voltage swing range.

Here is the Tina-TI circuit file:

TLV9052_400Hz_LP_01.TSC

Please note that the TLV9052 is a General Purpose Op amp that isn't normally covered by this Precision Amplifiers e2e forum. Any additional questions about it should be addressed to the General Purpose Op amps forum.

Regards, Thomas

Precision Amplifiers Applications Engineering