TLV320ADC3101: Can we set sample rates as 2.56KHz

burton hui

Prodigy 40 points

Part Number: TLV320ADC3101

Hi,

From TLV320ADC3101 spec, it says Supports ADC Sample Rates From 8 kHz to 96 kHz

But what will happen if we set Sample Rates below 8kHz ?

Now I need to configure sample rates as 2.56KHz, this is the reason why I ask this question

Thanks,

Burton

over 4 years ago

0 burton hui over 4 years ago

Prodigy 40 points

I am using TLV320ADC3101 to measure DC voltage, not for audio purpose

0 Zak Kaye over 4 years ago in reply to burton hui

TI__Mastermind 23050 points

Hi Burton,

TLV320ADC3101 and most audio converters are not specified for sample rates this low. Since this isn't something we test, it's hard to say whether or not it would work consistently for different devices.

Best,

Zak

0 burton hui over 4 years ago in reply to Zak Kaye

Prodigy 40 points

Zak,

Thank you for your info. I tried to set sample rate as 2.56K Hz and no issue till now. I will do some further test.

But I am still confused for one limitation in page 79 of TLV320ADC3101 spec:

" In all cases, AOSR is limited in its range by the following condition:

2.8 MHz < AOSR × ADC_fs < 6.2 MHz "

With this limitation, ADC sample rate is not possible below 21KHz. Is this a wrong limitation in spec ? Can you help to confirm?

Thanks,

Burton

+1 Zak Kaye over 4 years ago in reply to burton hui

TI__Mastermind 23050 points

Hey Burton,

The minimum supported sample rate is definitely 8kHz. I believe the AOSR condition you mentioned is only really applicable for the 44.1/48kHz case and the minimum for all sample rates would be much closer to 1MHz, which means it may be possible to operate down to 4kHz. That said, we still only guarantee device operation down to 8kHz and below this it is possible not all devices will perform well.

Best,

Zak

0 burton hui over 4 years ago in reply to Zak Kaye

Prodigy 40 points

Thank you，this resolved my question

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TLV320ADC3101: Can we set sample rates as 2.56KHz