I am wondering if it is possible to get more than 20mA fullscale output current from the AD9777, without degrading performance.
I see all of the plots in the datasheet are for 20mA.
I am hoping to use this device (or similar) on an ATE board, to interface with a new IQ modulator. The modulator is specified for 20mA, but having the capability to go up to 25mA would be ideal.
This board will then be used in Production Test.
I need the capability to source either a 10MHz sine wave or 10MHz/11MHz dual tone.
The digital on my ATE is limited to 50 MSPS at present, but with a licence add on I can get 100MSPS. Plus my ATE digital generates CMOS/TTL levels. I would require an CMOS->LVDS converter for any of the LVDS DACS. (Not a major issue)
Based on this limitation and having the ability to go greater than 20mA, is there a significant degradation in IMD when sourcing the dual tone mentioned.
The target Output IP3 of the Modulator is ~30dBm
I have looked at other devices, but I want to keep the pcb design as simple as possible and I'd like a DAC, I can get up and running relatively easily.
If you have and comments or other DACS in mind please let me know.
If you need more details, please let me know.