We typically use a DAC with WRT_A, B lines but we want to switch to 1.8V logic.
We cannot find any DAC like AD9765 with silmutaneous update feature for 1.8V.
Therefore we are thinking about to use 6 AD9116 with a shared databus and sperate clk lines for each DAC.
Beside any fanout issues ...
Is it possible to delay and synchronize the output of all DAC with the CLKIN rising HIGH edge ?
How the retimer circuit comes into account and what is the expected latency. We have a window
of about 100ns for programming all.
scheme
time |------------------- 100ns --------------------------------------------------------------------------------------|-------------------------------------- ....
Programming
DAC1: DCLKIO __|------|______________________________________________________
DAC2: DCLKIO ________|------|________________________________________________
DAC3: DCLKIO ______________|------|__________________________________________
DAC4: DCLKIO ____________________|------|____________________________________
DAC5: DCLKIO __________________________|------|______________________________
DAC6: DCLKIO ________________________________|------|________________________
time |------------------- 100ns --------------------------------------------------------------------------------------|-------------------------------------- ....
Update DAC
DAC1: CLKIN __________________________________________________________________|------|_________
DAC2: CLKIN __________________________________________________________________|------|_________
DAC3: CLKIN __________________________________________________________________|------|_________
DAC4: CLKIN __________________________________________________________________|------|_________
DAC5: CLKIN __________________________________________________________________|------|_________
DAC6: CLKIN __________________________________________________________________|------|_________
Prog
DAC1: DCLKIO __________________________________________________________________|------|_________
DAC2: DCLKIO ________________________________________________________________________|------|___
...
Regards,
Mark
