DRAM -> However all I want is the capacitor array, (or does a circuit like this even exist)?
I might have read this wrong, however, you are not going to get the functionality you desire in an array. Nobody makes an IC that stores an analog value in an array, if there is anything its custom. 

You can use IC's such as the LT1043 that have fast switching capabilities to 'store' voltage values in a capacitor. There are 4 switches per chip. Shown below is an example of how you would wire it to an instrumentation amplifier to provide chopping action to modulate DC for lower noise, but you can wire it to anything you like.