TLV320AIC3204: Question regarding start-up inrush current and internal circuit before ADC

Hi,

1. You can refer to section 2.9.1 of the following document:

https://www.ti.com/lit/ml/slaa557/slaa557.pdf?ts=1643644455435

2. There's no internal LPF before ADC, the device input ac-coupled cap and internal input impedance forms a high pass filter, see a FAQ post here for more information.

https://e2e.ti.com/support/audio-group/audio/f/audio-forum/773059/faq-tlv320aic-codecs-how-do-i-calculate-the-input-impedance-of-an-tlv320aic-device

Regards.

Hello,

Sorry for my for my late reply.

1. Your suggested document only described about current consumption at each mode. But we'd like to know about drawing current during device start-up(or powering-out) condition. This is not stable and I think we cannot classify for this operation mode.
Would you tell me about a mount of inrush current at start up condition?

2. I understand.


Thank you and best regards,
Kazuki Kuramochi

Hi,

We don't spec that as in rush current depends on the system capacitance and the slew rate of the supply.

Regards.

Hi Expert.

Would you provide rush current when they use external capacitor following typical application circuit?

Best regards,
Kazuki Kuramochi

Hi Kazuki,

Peter is out of office today and will respond to you early next week.

Brian

Hi,

Our boards are built differently from the application circuit as it needs to cover other device variants.

As most of the blocks by default are disabled the current is not going to be significant thus it should not be a concern here.

Regards.

Hello,

I understand EVM is using different external components against typical application circuit.
However, We cannot distinguish about whether inrush current will be issue without any value.
Could you provide expected inrush current with EVM?
If you cannot provide this, can you provide estimated maximum inrush current (as like as it probably don't exceed maximum current consumption of device or something like that)?

Best regards,
Kazuki Kuramochi