ADS5294: DC-coupling buffer for ADS5294

Viktor Grytsenko

Expert 1225 points

Part Number: ADS5294
Other Parts Discussed in Thread: THS4130

Hello all,

can I use ADS5294 with the DC-coupling input buffer ?

If yes,

please give me reference to the appropriate example of diff.amlpifier sheme that can be used

with the ADS5294.

Thank you,

Best regards,

Viktor.

over 8 years ago

0 Praveen Aroul over 8 years ago

TI__Guru 50036 points

Hi Viktor,

Theoretically yes you should be able to DC-couple the input of the ADS5294 using a differential amplifier such as THS4130.
For the above case, the common mode output voltage (VCM) from the ADC must be connected to the diff. amp. outputs.

But if you are using the diff. amp. then you could AC couple the inputs as shown in the application circuit.
What is your application and why would you like to DC-couple the inputs?

0 Viktor Grytsenko over 8 years ago in reply to Praveen Aroul

Expert 1225 points

Hi, Praveen

I want to get bandwith from DC to up about 50 MHz.

So I can not use serial capasitors on the outputs of diff. amplifier.

Can I use scheme analogous to shown on Figure 38, Figure 41 of THS4130 Data Sheet,

where Vcm goes directly from outputs of THS4130 ?

Thank you,

Best regards,

Viktor.

0 Viktor Grytsenko over 8 years ago

Expert 1225 points

Hi, Praveen

Can be used scheme analogous to shown on Figure 38, Figure 41 of THS4130 Data Sheet,

where Vcm goes directly from outputs of THS4130 ?

Thank you,

Best regards,

Viktor.

0 Praveen Aroul over 8 years ago in reply to Viktor Grytsenko

TI__Guru 50036 points

Hello Viktor,

Yes you can use a scheme similar to the one shown in Figure 38.

0 Viktor Grytsenko over 8 years ago in reply to Viktor Grytsenko

Expert 1225 points

Hello, Praveen

Thank you,

Best regards,

Viktor.

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ADS5294: DC-coupling buffer for ADS5294