TLV320AIC3105: Analog full-scale 0dB input voltage

Shinichi Inoue

Guru 21556 points

Part Number: TLV320AIC3105

Dear Specialists,

My customer is considering TLV320AIC3105IRHBR and has a question.

I would be grateful if you could advise.

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Regarding TLV320AIC3105IRHBR on the data sheet

8.3 Recommended Operating Conditions Analog full-scale 0-dB input voltage

(DR VDD1 = 3.3 V) → 0.63VRMS

8.5 Electrical Characteristics Input signal level (0 dB) → 0.707VRMS

The value is different.
Which is the analog input level that becomes 0 dBFS at the time of AD conversion?

On the other hand, TLV320AIC3107IRSBR datasheet, both are 0.707VRMS.

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I appreciate your great help in advance.

Best regards,

Shinichi

over 4 years ago

0 Collin Wells over 4 years ago

TI__Guru 63855 points

Hello,

The typical expected full-scale input level is 0.707Vrms as indicated in Section 8.5. However, there is a non-zero 0.82dB gain error in the ADC path that reduces the typical input range down to from 0.707Vrms to 0.9099 * 0.707 = 0.643Vrms. This is where the spec comes from in the recommended conditions.

0 Shinichi Inoue over 4 years ago in reply to Collin Wells

Guru 21556 points

Hi Collin,

Thank you for your reply.

I'll share your answer with the customer.

I appreciate your great help and cooperation.

Best regards,

Shinichi

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TLV320AIC3105: Analog full-scale 0dB input voltage