PCM1864-Q1: About power on reset timing diagram

Lee, Sam

Part Number: PCM1864-Q1

Hello team,

For the power-on reset timing diagram in PCM1864-Q1 datasheet,

-. Could you please explain what the “REF Fast Boot” means?

-. At the actual measurement below, the VREF’s behavior seems different from the REF in Figure26. Are the two(VREF, REF) different?

Thanks,

Sam Lee

10 months ago

0 Sanjay Dixit 10 months ago

TI__Mastermind 22860 points

it looks from the diagram that after 16 clocks and 2ms the Vref should be stable.Can you zoom in to check the time duration between VREF and LDO Waveforms?

0 Lee, Sam 10 months ago in reply to Sanjay Dixit

TI__Expert 5205 points

Hi Sanjay,

I got the zoom in waveform. Would you please check its?

FYI - In previous waveform, the names of LDO and VREF were revsered. It's fixed here.

Best Regards,

Sam Lee

0 Sanjay Dixit 10 months ago in reply to Lee, Sam

TI__Mastermind 22860 points

It looks that Vref is stable after 2ms of application of power. This is fine

0 Lee, Sam 10 months ago in reply to Sanjay Dixit

TI__Expert 5205 points

Hi Sanjay,

Thank you for confirming it.

So, back to my original question, the REF of “REF Fast Boost" in Figure 69 is an internal signal rather than a direct VREF voltage, right?

Best Regards,

Sam Lee

+1 Sanjay Dixit 10 months ago in reply to Lee, Sam

TI__Mastermind 22860 points

Thats correct.

Audio

Audio forum

PCM1864-Q1: About power on reset timing diagram