I need ADC with really differential input and single supply.
-IN connected to reference point (REF/2)
+IN connected to input signal (+\- 2.5v)
I tried AD7684 but DataSheet tells that +IN and -IN MUST be in opposite phase to reference point. I used MCP3301 which is pin2pin compatible with AD7684 but allow any signals on inputs.
Now we need 500kS ADC and MCP3301 couldn`t achieve this.
Could you advice ADC or solution for AD7693 to adapt it to described use case.
Thank you in advance.
What Klaus mentioned are right. There are three most common types of ADC input structure a.) Single- Ended b.) Pseudo Differential c.) True Differential. From your description above I can see that you are looking for ADC that has a pseudo-differential input structure, where the -IN can have a DC input and +IN will have an AC signal. Below is the list of ADIs Pseudo-Differential ADC and is divided base from their sampling rate. You may Consider this list and check them depending on your application. You can go to the ADI website to check the details. Hope this help.