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THS4509: Question about THS4509 and ADS6124 connection

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,