TLV320ADC3140: Performance for single-ended input mode

Sadanori Kato

Part Number: TLV320ADC3140
Other Parts Discussed in Thread: TLV320ADC5140, ADC5140EVM-PDK

Hi,

For the single-ended input mode, could you please share the performance(SNR, DR and THD+N) at both 3.3V and 1.8V with me?
The performance for the differential input mode is mentioned in TLV320ADC3140 data sheet as follows.

Best regards,
Kato

over 3 years ago

0 Collin Wells over 3 years ago

TI__Guru 62055 points

Hello Kato-san,

In the TLV320ADC5140 devices the noise contribution of the PGA is lower than the ADC so while the input signal decreases in magnitude by -6dB when going from DE to SE operation the SNR and THD only degrade by -2dB.

In a device without a PGA the performance would be expected to drop by approximately -6dB with the -6dB reduction in input swing.

0 Sadanori Kato over 3 years ago in reply to Collin Wells

Guru 36490 points

Hi Collin-san,

Thank you for the information.

I understand.

Best regards,
Kato

0 Sadanori Kato over 3 years ago in reply to Sadanori Kato

Guru 36490 points

Hi Collin-san,

I would like to confirm just in case, but is my understanding correct that SNR, THD+N and DR would degrade by -2dB if using TLV320ADC3140 with the single-ended mode?

Best regards,
Kato

0 Collin Wells over 3 years ago in reply to Sadanori Kato

TI__Guru 62055 points

Hello,

That is correct. We only had an ADC5140EVM-PDK available when your request came in but we made measurements on that board and saw the aforementioned -2dB reduction.

0 Sadanori Kato over 3 years ago in reply to Collin Wells

Guru 36490 points

Hi Collin-san,

Thank you for your prompt reply.

If possible, could you please share the detailed measurement results in the the single-ended mode with me?

Best regards,
Kato

0 Collin Wells over 3 years ago in reply to Sadanori Kato

TI__Guru 62055 points

Hello Kato,

I can't guarantee we saved the plot from the measurements last week, but I will ask my colleague Zak to share it with you if we have it, or we can collect another next time we're in the lab in the upcoming days.

0 Sadanori Kato over 3 years ago in reply to Collin Wells

Guru 36490 points

Hi Collin-san,

Thank you for your support.

There is no need to make additional measurements, but I would appreciate if Zak-san has the measured data and could share it with me.

Best regards,
Kato

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TLV320ADC3140: Performance for single-ended input mode