DRV135: DRV135 to PCMx140-Q

Kyle Roman

Part Number: DRV135
Other Parts Discussed in Thread: INA137,

Tool/software:

I am design a high quality microphone receiver. I am looking to use the DRV135 to drive a balanced audio signal through a cable. On the receiving end I have a PCMx140-Q ADC. What should I put between the incoming balanced Audio signal and the ADC to make sure the input does not exceed the 2Vrms? I assume using the differential input of the ADC would provide the best performance, so I was ruling out the INA137 (and family).

[Microphone -> PreAmp -> DRV135 -> cable -> ? -> PCMx140-Q]

On another note:

Is the DRV135 state of the art for driving balanced audio signals?

Thank you,

Kyle

6 months ago

0 Raymond Zhang1 6 months ago

TI__Guru* 77521 points

Hi Kyle,

Kyle Roman said:
What should I put between the incoming balanced Audio signal and the ADC to make sure the input does not exceed the 2Vrms?

Here is a similar audio application note for your reference.

https://www.ti.com/lit/ug/sbou078/sbou078.pdf?ts=1743065177092

You can design an op amp buffer or gain stage with a clipping circuit using diodes or Zeners to limit the input voltage up to 2Vrms. Alternatively, you may add automatic gain control circuit to adjust the signal level, but this may get more complicated than you want to implement.

Kyle Roman said:
Is the DRV135 state of the art for driving balanced audio signals?

DRV135 is a single ended to differential output converter. It can drive more current than typical differential audio amplifier.

If you want to look for state of art line drivers, here are other options.

https://www.ti.com/audio-ic/amplifiers/overview.html?keyMatch=audio%20amplifier&tisearch=universal_search

https://www.ti.com/audio-ic/amplifiers/line-receivers/products.html

If you have other questions, please let us know.

Best,

Raymond

Audio

Audio forum

DRV135: DRV135 to PCMx140-Q