I am looking for a DAC to implement a pulse amplitude modulation protocol for optical communications.
In practice I need to generate a RZ or NRZ (return to zero / non-return to zero) multi-level digital signal at a symbol rate of 625 Msps or 1.25 Gsps.
The AD9129 seems like a good candidate but like most of the RF DACs is characterized in terms of SFDR and frequency domain. What is its time domain response?
Will I be able to generate my multi-level digital signal with it? What scares me most is the 13 ns settling time. If I understand it correctly, this will limit my signal generation to below 100 MHz. Am I missing something or my reasoning is correct?