ADC10065: Question about oscillation the VREF and Vcom

Hi Satoshi

1, 2) I'm reviewing the product information to understand why the Vcom voltage may be shifting like that in their usage.

Can you get the customer to try using a continuous instead of burst mode clock to see how the Vcom voltage behaves in that condition?

3) All datasheet specifications assume a continuous clock. The internal Vref is listed as 1.2V typical and the Vcom is listed at 1.45V typical. You are correct, there are no limit specifications for these parameters in the datasheet, only a Vreftc spec for variation versus temperature.

Thanks,

Jim B

Jim-san

Thank you for reply,
I looking forward your update.

Best regards,
Satoshi

Hi Satoshi

I haven't found any documentation that explain the shifts shown in the customer results.

Has the customer followed my recommendation to try testing with a continuous clock to see how the Vcom and VREF behavior changes?

Jim B

Jim-san

Thank you for check.

Please see customer update below;

⇒For tensing with a continuous clock, VCOM was stable.

　・TXADC_CLK：stop

・TXADC_CLK：continue

Is ADC10065 have bad influence for the condition of TXADC_CLK：ON and OFF?

Best regards,

Satoshi

Jim-san
Thank you for reply,

Please let me know about relation of VCOM and Clock for ADC10065 internal circuit.
①About rapid start/stop, I think that device is forced shutdown when after clock stopped, is it correct?
②If correct, I guess that device shutdown and abnormal current is flow internal circuit.
Is there internal circuit information for current flow (Current capacity, route, etc)?
　※If any information, I maybe understand relation of VCOM and Clock.

Best regards,
Satoshi