Vcom output current of ADC10065

Satoshi

Guru 19485 points

Other Parts Discussed in Thread: ADC10080, ADC10065, TLV379

Customer will try to connect Vcom output to OPAMP input signal.

Please let me know about two point below.

①If use case of bias supply, can Vcom use to connect OPAMP input?

②Please let me know output current of Vcom.

③If ① can't use, is it possible to use buffer IC between Vcom to OPAMP?

Best regards,

Satoshi

over 7 years ago

0 Jim Brinkhurst1 over 7 years ago

TI__Mastermind 43910 points

Hi Satoshi

The Vcom output has very little current drive capability. Please see this previous E2E post addressing the same question for the ADC10080 (higher speed version of ADC10065).

https://e2e.ti.com/support/data_converters/high_speed_data_converters/f/68/p/391359/1383915

Best regards,

Jim B

0 Satoshi over 7 years ago in reply to Jim Brinkhurst1

Guru 19485 points

Jim-B san

Thank you for reply,

Sorry for addition;

If customer use very low bias current OPAMP, can below connection normal operation?

※The other OPAMP spec； 1Vpp and 10MHz square wave

Best regards,

Satoshi

0 Jim Brinkhurst1 over 7 years ago in reply to Satoshi

TI__Mastermind 43910 points

Hi Satoshi

Yes, for the U1 device in the schematic above, make sure it has input bias current low enough. Something like the TLV379 would be appropriate.

Best regards,

Jim B

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Vcom output current of ADC10065