Maybe a stupid question, but is it possible to feed a nDAC and a CD555 from 2 x 555ps in the following configuration:
555ps (output 1) and 555ps (output 2) feed the CD555 while at the same time 555(output 2) feeds the nDAC.
In this configuration the CD555 would benefit from two 555ps rather than having on 555ps feeding each of nDAC and CD555.