TLV320AIC3104: MICBIAS and MCLK question

Ryo Akashi

Part Number: TLV320AIC3104

Hello experts,

I have questions about TLV320AIC3104 circuit.

1. MICBIAS
If customer use single-ended with MIC2L/R, should they need to connect MICBIAS like differential use case?

2. MCLK input
Do you have any recommended clock frequency for MCLK?
With using Audio CODEC/ADC PLL Calculator(SLAR163.ZIP), we can't find out the value which satify PLL Consytaints section.

Thanks and best regards,
Ryo Akashi

over 1 year ago

Jeff McPherson over 1 year ago

TI__Mastermind 23245 points

Hi Ryo,

MICBIAS here is just used to power the microphone. It should be the same as the highlighted area, but refer to your microphone model on how MICBIAS should be used.

Most multiples of audio clocks will work well. See below for an example using 12.288 MHz

Best regards,

Jeff

Ryo Akashi over 1 year ago in reply to Jeff McPherson

TI__Expert 8980 points

Hello Jeff-san,

Thank you for your reply.
Regarding microphone model, you mean it is the specification of microphone which customer plan to connect?

Thanks and best regards,
Ryo Akashi

Jeff McPherson over 1 year ago in reply to Ryo Akashi

TI__Mastermind 23245 points

Hi Ryo,

Yes I mean the spec of the customer microphone used in the design.

Best regards,

Jeff

Ryo Akashi over 1 year ago in reply to Jeff McPherson

TI__Expert 8980 points

Hello Jeff-san,

Ok, I ubderstand the spec is about microphone itself.
For what kind of microphone, do we need to connect?
Customer plan to use the microphone which I/F is 3 terminal : 12V(+), (-), Mic signal.
In this case, microphone can get supply from 12V(+), (-), so we don't need to connect like example?

Thanks and best regards,
Ryo Akashi

Ryo Akashi over 1 year ago in reply to Ryo Akashi

TI__Expert 8980 points

Hello Jeff-san,

Could you give me reply?

Thanks and best regards,
Ryo Akashi

Jeff McPherson over 1 year ago in reply to Ryo Akashi

TI__Mastermind 23245 points

Hi Ryo,

Apologies for the delay, I was out of office last week.

In your case it sounds like you can get the supply for 12V like you mentioned.

Best regards,

Jeff

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TLV320AIC3104: MICBIAS and MCLK question