TLV320AIC3100: TLV320AIC3100 Power up sequence

Hello David,

The AIC3100 supply sequencing is extremely tolerant but following the recommended sequence will provide the most robust operation. When the digital supplies are powered on first, AVDD may get back powered to DVDD level. This will cause the device to potentially source current to other devices in the system that use that supply. The CODEC is not designed to source high current so if this happens, there may be a reliability issue. 

Once analog supplies are powered on, the CODEC will resume normal operation. What is the time from digital supply to analog supply bring up?

Regards,

Aaron

Hi Aaron;

In order to not back-drive the SPKVDD, we would like to consider powering the SPKVDD from a 3.6 or 5.0V rail first, as described in the datasheet.  We will not be using the class D amp in our application, or using the SPKR outputs at all.  Can you advise what the what is the max current draw of the SPKVDD will be for for 3.6V and 5V?

Hello David,

If the Class-D drivers are not needed, why use the TLV320AIC3100 and not a device like the TLV320AIC3101 or TLV320AIC316?

For the current draw on SPKVDD, I will need to ask the design team to see if they have data on this. The current draw in my opinion will be very minimal since the drivers are off and there is no load connected to the output. 

Regards,

Aaron

Hi Aaron;

We are using this part as it is a high runner in our factory and we need other features, but not the Class D output.

Please let me know about the expected current draw.

Hello David,

Design team couldn't give me any quantifiable data but did confirm That the current draw would be very low. 

I found the following spec from the data sheet. Granted, this was done with all other blocks off. I can go to the lab early next week to take measurements on an EVM if needed. 

Hi Aaron;

Thank you.  It will close this out with the customer if you could confirm the EVM SPKVDD current with the part fully on, and the class D not in use.