TLV320AIC3105: TLV320AIC3105 MICBIAS NOISE

Rio

Part Number: TLV320AIC3105

Hello,
We are considering replacing a competitor's device with the TLV320AIC3105.
Could you let me know the Noise in the Signal Bandwidth (nV/SQRT(Hz)) for each setting on the MICBIAS power supply terminals?

over 3 years ago

0 Daveon Douglas over 3 years ago

TI__Mastermind 27710 points

Hi Rio,

This is a relatively old IC and we don't have the spec/graph of noise signal in relation to MICBIAS supply. However, if you want to reduce noise you're experiencing from MICBIAS I suggest adding an RC filter ( try 100Ω & 10µF cap).

Also, if your MICBIAS is 2V, maybe try increasing that and also disable AGC in register 26 and 29 for the time being to reduce noise.

Here is apps note for common noise in audio codecs: (section 2.3)

https://www.ti.com/lit/an/slaa749/slaa749.pdf?ts=1657143428081&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTLV320AIC3101&_ticdt=MTY2NTUyNTYwMnwwMTdmMjMyY2Y1YjYwMDA3ODEzM2UxNmQxZmNmMDUwNzMwMDQ1MDZiMDBiZDB8R0ExLjIuNDAwMTgxMTMuMTY0NTU2MjYzMA

Regards,

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TLV320AIC3105: TLV320AIC3105 MICBIAS NOISE