PCM1773: How can we confirm whether PCM1773 will not broken by adding an ESD protection device?

Kazuya Nakai59

Guru 20130 points

Part Number: PCM1773
Other Parts Discussed in Thread: TPD1E1B04, TPD1E0B04

Hello guys,

One of my customers is using PCM1773 for their current products. The customer has a question as the follow. Could you please give me your reply or comment?

According to their information, in very rare case, VOUTL or VOUTR of PCM1773 on their products was boken when ear-phone jack connected to a audio AMP input was inserted to ear-phone plug connected

to couppling capacitor connected VOUTL or VOUTR terminal of PCM1773.

So they are considering attaching ESD protection device, TPD1E1B04 between coupling capacitor output connected to OUTL or OUTR and GND.

At this situation, they have the following question.

Q. In general, how can we confirm whether PCM1773 will not broken by adding an ESD protection device?

Is it O.K. to confirm that OUTL and OUTR terminal voltage of PCM1773 at ear-phone jack inserting is less than OUTl/R absolute maximum ratings ( VCC+0.3V or GND-0.3V)?

But I think it is difficult to reduce OUTL/R voltages less than the absolute maximum because TPD1E1B04 break down voltage is about 6.4V.

Could you please give me your reply or comment? It would be much appreciated.

Best regards,

Kazuya.

over 4 years ago

0 Paul_Frost over 4 years ago

TI__Guru 52683 points

Hi Kazuya-san,

I think that the addition of the ESD cell will help. It will be difficult to guarantee anything if the pin ever experiences a voltage greater than the absolute max. You could look at the TPD1E0B04 device as well. It has a slightly lower breakdown voltage of <6V, so that should comply with the abs. max table. http://www.ti.com/lit/ds/symlink/tpd1e0b04.pdf

Could they test this?

Thanks,
Paul

0 Kazuya Nakai59 over 4 years ago in reply to Paul_Frost

Guru 20130 points

Hi Paul,

Thank you very much for the prompt reply.

We prepared TPD1E0B04 sample for them and they received the sample yesterday. They will start to evaluate the device effect today.

Do you think TPD1E0B04 is the better device as ESD/Surge protection device to avoid PLC1773 OUTL breaking? They use PCM1773 with 2.85V (VCC1/VCC2=2.85V).

If you have any other recommended devices, please let me know.

Thank you again and best regards,

Kazuya.

0 Paul_Frost over 4 years ago in reply to Kazuya Nakai59

TI__Guru 52683 points

To be honest, I am not sure which will provide better protection. One has a lower break-down voltage but also a lower current limit. I still think a lower break-down voltage is better.

Thanks,

Paul

0 Kazuya Nakai59 over 4 years ago in reply to Paul_Frost

Guru 20130 points

Hi Paul,

Thank you very much for your reply.

I still have a few questions about PCM1773 and I'd like to ask you with the customer actual circuits off line.

So could you please tell me your e-mail address?

Thank you again and best regards,

Kazuya.

0 Paul_Frost over 4 years ago in reply to Kazuya Nakai59

TI__Guru 52683 points

My email is frost@ti.com.

Thanks,

Paul

0 Kazuya Nakai59 over 4 years ago in reply to Paul_Frost

Guru 20130 points

Hi Paul,

Thank you very much for telling me your e-mail address.

I will send you my questions by e-mail the begin of next week because I am gathering some information now.

Thank you again and best regards,

Kazuya Nakai.

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PCM1773: How can we confirm whether PCM1773 will not broken by adding an ESD protection device?