TLV320AIC3110: AVDD and HPVDD - Supply Rail Specifications

David Kearney

Part Number: TLV320AIC3110

Hi Guys,

I'm in the process of laying out my PSU design strategy for my board and could get your advice on the Analog supply rails to the TLV320AIC3110. I have some spare LDOs on a PMIC that have ~40dB PSRR and I'm wondering would this be good enough to feed the AVDD and HPVDD rails of the device? The LDOs are powered by a 3.6V switch mode and output 3.3V with 40 dB PSRR. Does this sound appropriate as far as minimizing noise coupled onto the analog portions of the codec is concerned? Otherwise I can add a dedicated 70-80 dB PSRR LDO for a really clean signal (as I am doing for the Speaker VDD), but I don't want to over-spec if I don't need it.

Your feedback would be much appreciated.

Many Thanks,

Dave

over 8 years ago

0 Luis Fernando Rodriguez S. over 8 years ago

TI__Guru* 84915 points

Hi, David,

Our audio converters are sensitive to changes or noise at the power supply rails, specially AVDD. Some of the codec functions directly depend of the AVDD voltage such the ADC level. Any variation may affect the full-scale voltage at the ADC. So, I would suggest to use a power supply with >50dB PSRR. Additionally, I strongly recommend to follow the layout considerations of datasheet.

You may find more details to reduce noise issues in codecs in our wiki article below. It may help you to have a good design and noise reduction.

e2e.ti.com/.../3377.common-noise-issues-in-codecs

Best regards,
Luis Fernando Rodríguez S.

0 David Kearney over 8 years ago in reply to Luis Fernando Rodriguez S.

Intellectual 590 points

Thanks Luis :)
Dave

0 David Kearney over 8 years ago in reply to David Kearney

Intellectual 590 points

Hi Luis, quick follow up.

The datasheet recommends the codec power sequence be: Speaker Rails -> Digital Rails -> Analog rails, but doesn't mention power down sequencing constraints. Is it OK to remove power from the rails simultaneously without causing any issues? Cheers, Dave

0 Luis Fernando Rodriguez S. over 8 years ago in reply to David Kearney

TI__Guru* 84915 points

Hi, David,

There's no power down sequence. So, you may remove power from rails simultaneously. However, we recommend to mute and power down the codec blocks before remove the power rails.

Best regards,
Luis Fernando Rodríguez S.

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TLV320AIC3110: AVDD and HPVDD - Supply Rail Specifications