THS4509: Question about THS4509 and ADS6124 connection

Wayne Wang20

Part Number: THS4509
Other Parts Discussed in Thread: ADS6124

Dear experts,

My customer is developing a system with THS4509 and ADS6124. The power supply of THS4509 is 3.3V and 0V. The connection between THS4509 and ADS6124 is DC coupled.

As the input common mode voltage of ADS6124 needs to be 1.5V. So the customer directly connects the Vcm pin of ADS6124 to the Vcm pin of THS4509 to get a 1.5V common mode output. However, when they measure the Vcm voltage on the PCB, the result is 1.0V. Do you have any comment on this issue? Thank you!

Best regards,

Wayne

over 6 years ago

0 Rohit Bhat over 6 years ago

TI__Genius 15975 points

Hi Wayne,

Does the customer have any resistor to gnd between the THS4509 and the ADS6124? Also, is the Vcm voltage measurement of 1.0V seen at the THS4509 outputs or the ADS6124 inputs? It would be really helpful if the customer schematic is available for debug.

Best Regards,
Rohit

0 Wayne Wang20 over 6 years ago in reply to Rohit Bhat

TI__Expert 4360 points

Hi Rohit,

Thanks for your reply. I sent you an email with the customer schematic. Any comment will be appreciated.

Best regards,
Wayne

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THS4509: Question about THS4509 and ADS6124 connection