TAA5242: IO pins impedance

Hi,

Let me check on the pull-down description and the tolerance for input impedance and get back with a response on this thread within a couple of days.

Thanks and Regards,

Lakshmi Narasimhan

Hi 

Can you reply our customer question ?

best regards,

Hi Imi-san,

Lakshmi is out of office today. He will follow up with you tomorrow.

Thanks for your patience,
Jeff McPherson

Hi Jeff-san,

Thank you, I understood. We are waiting for his answer.

Best regards,

Hi Imi-san,

As mentioned in the datasheet description, the input impedance can have up to +/-20% variation.

Thanks and Regards,

Lakshmi Narasimhan

Hi Lakshmi-san,

Thank you for your help. As I checked in the datasheet, that specify the analog input impedance 5k-ohm +/-20%.

How about dugital IO related questions.

- could you please let us know if 20k-ohm pulldown resistance is applied for all digital pins ? 

- could you also let us know what if "asserted on" described in Rpd description ?

Best regards,

Hi Imi-san,

Our digital design expert is out of office this week and will be back Monday.

I will get the confirmation on this and update this thread accordingly.

Thanks and Regards,

Lakshmi Narasimhan

Hi Imi-san,

I have checked with the digital design team, they have confirmed the following:

There is a weak pull-up resistance (typical 20kOhm) on the DOUT pin alone. This pull-up resistance is seen when the device is powered up (or "asserted on").

The rest of the digital I/O pins do not have this resistance.

This clarification will be updated the datasheet.

Thanks and Regards,

Lakshmi Narasimhan

Hi Lakshmi-san,

I would like to make sure that TAS5242 built in Pull UP resistor on DOUT only?  The datasheet says "Pull DOWN resistor" though.

regards,

Hi Lakshimi-san,

H has further question about DOUT pull up resistance condition. As we know the 20k-ohm pull up is active when power up and assert on, how about sleep mode ?

Does DOUT HiZ state in sleep mode condition.

Best regards,

Hi Imi-San,

Are we referring to the state where device is powered up, but the ASI clocks (BCLK, FSYNC) are not present?

Thanks and Regards,

Lakshmi Narasimhan

Hi Lakshmi-san,

Yes. He needs to know DOUT status in sleep mode or low power mode, i.e. no ASI cloks,

Best regards,

Hi Imi-san,

The weak pull-up will be there on DOUT pin when there are no ASI clocks.

Thanks and Regards,

Lakshmi Narasimhan

Hi Lakshmi-san,

Thank you for your feedbak. 

Could you please let us know the pull-up resistance in no ASI clock case ?

Best regards,