AD5443 DAC buffering

Hi Tim,

Can you please provide the schematic? Do you plan to use a single reference device for the eight DACs rather than each of the DAC?

Cheers,

Ivan

Hi Ivan-

No schematic yet...still in the architecture stage. But having only one reference was our idea. Let's say our 10V reference can put out +/-20mA. That should be enough for the 16 loads of approximately 10KOhm. But is there a problem with them all sharing the same reference output, analogous to the charge injection which ADCs experience when sampling?

-Tim

Hi Timothy,

Apologies for the late response. There's no charge injection behavior in MDAC's reference input as there's no sampling capacitor used. Additionally, there would be no load change as the input reference's load is code independent. But the switching artifacts during code changes might be coupled through the reference going to other DACs.

Cheers,

Ivan