Driving ADC AD7626

Hello,

           I would suggest taking a look at our ADC Driver tool. I think this may off great assistance in helping you figure out the circuit you need. 

As an example, here I've used ADA4945-1 one of our FDA parts to provide the single ended to differential conversion, taking a bipolar single ended input with the AD7626. The tool is really useful for helping to figure out the circuit you need and also it can give you good information on noise and distortion

https://tools.analog.com/en/adcdriver/#adc=AD7626&cext=2.2e-10&driver=ADA4945-1&frequency=2000&gain=1&multiplexed=false&nTab=1&oss=false&rext=20&rf=1000&sTab=1&samplingRate=10000000&showAdcVariant=false&showDriverVariant=false&sourceType=1&tab=1&thd=200&topology=1&vSupplyNeg=-0.4&vSupplyPos=4.5&vref=4.096&wbNoise=0

If you wish to go a little specifically on the driver amplifier side our Diff Amp Calculator ADI-DiffAmpCalc | Analog Devices can give a little more details in terms of signal levels, headroom etc. (The ADA4945-1 datasheet is also a great source of information of how these calculations are made.)

Let us know if this helps get you started or if you need further information.

Thanks