TLV320AIC3120EVM-U: How should I measure the output waveform?

Byoungjin Kim

Part Number: TLV320AIC3120EVM-U
Other Parts Discussed in Thread: TLV320AIC3120

I am planning to use the TLV320AIC3120 for audio input and output.

I'm trying to apply it to RF equipment, and I need to measure the output audio characteristics.

The characteristics of the SINE Wave must be measured, but the TLV320AIC3120 is composed of a D-Class audio amplifier, so the waveform cannot be measured on an oscilloscope.

Only the 360khz pulse waveform was measured.

How do I measure analog audio signals? Is it possible?

11 months ago

0 pdjuandi 11 months ago

TI__Mastermind 29745 points

Hi,

For class-D, you can put a low pass filter, R=100 and 0.047uF at the output.

Regards.

0 Byoungjin Kim 11 months ago in reply to pdjuandi

Prodigy 40 points

This was measured after applying the RC filter.

A 500Hz sine wave was generated on a PC and the output was measured.

To measure SINAD, a clean sine wave must be measured, but it cannot be measured using an RC filter alone.

The same applies if an LC filter is applied.

Analog output waveform is required. is there any other way?

+1 pdjuandi 11 months ago in reply to Byoungjin Kim

TI__Mastermind 29745 points

There are filters like the following you can use for measurement.

https://www.ap.com/analyzers-accessories/accessories/aux-family-switching-amplifier-measurement-filters/

Regards

0 Byoungjin Kim 11 months ago in reply to pdjuandi

Prodigy 40 points

There is no simple way, right?

OK, thank you.

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TLV320AIC3120EVM-U: How should I measure the output waveform?