ADA4940-1 with single supply

Question

Hi, 
 I am using ADA4940-1 to drive ADC AD7982. ADA4940-1 is powered by single supply 5V. But I find that there are some issues when signal cross zero area (nearby 0V voltage). Read from ADA4940-1 and AD7982 datasheet, I understand ADA4940-1 should be powered with two supply (probably 7V and -2V) to solve this issue. This will need re-spin the board. My question is: Is there any new ADC driver with single supply which can sove the issue cross zero voltage (prefer pin compatible)? My circuit is attached here for your reference. Looking forward to your reply soon. Thank you very much.

maaarmas · Accepted Answer

Hi Victor_sg , 
 It's true that to we need to have dual supply to cancel the headroom issue. For ADA4940-1, you could probably use a +7V and -0.5V or -1V so that it will not reach the abs max which is only 8V. We cannot guarantee any specs if it is not within the specs. 
 What I could recommend is either use a +7V and -0.5V or replace the ADA4940 that can handle 10V like ADA4932. 
 Thanks, 
 Mae)

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ADA4940-1 with single supply