Where should the -Vs pin of AD8475 be connected to?

Hi Benyuan,

Try ADA4940 or ADA4807. Also, please see Applications Information Section of the AD4003 datasheet.

Regards.

Hello liubenyuan

Please note that simulation sometimes has computational problems that have nothing to do with actual part performance.

There are just two main concerns when setting the Vsupplies.

1. This part is specified only for total supply voltage difference up to 10 V. Beyond that some internal component may break down and make the part not function. Worse it may destroy the part and other circuitry connected to the part.

2. The output of these devices should not go much closer to any supply than about .4 to .5 V. You can tell that since the nonlinearity is specified with a 4 V swing when Vs+ is 5 V. and Vs- is 0 V. So if you have Vs+ = 5V. likely your performance will get better when you switch the -Vs to -5V. at the expense of doubling the power drain.

Concerning your final question you may sacrifice performance at Vs = 5 V. and 0 V. if you need to have Vout approach 0 V.

Even though the data sheet says the swing goes to -Vs + .05 V. there is no measure of quality, no criterion shown for this condition. The part may actually be railed in this condition generating much distortion.

Regards,

Chris

Thanks for your reply. Is there any alternate ADC drivers that can driver AD4003, 18bit, 2MSPS ADC with acceptable performance?