AD7606-6 - Delay from Analog Input to Digital Output


I am DFAE from Phoenix Technologies in Israel.

One of my customers use the AD7606-6 for power metering application.

Their analog signal voltage level is +/-10V.

They don't use the internal LPF

They see delay between analog input to digital output with the analog signal from +/-1.5V and above.

The delay increased when the analog input voltage increased.

On  +/-1.5V the delay is ~2msec and on +/-10V the delay is ~14msec

Please advise if is it proper behavior of the part?

This delay is to large for them

Thanks a lot,