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Altera_Forum
Honored Contributor
Honored ContributorAbout CycloneV and Texas instruments ADC
Hello to all!
I would like to connect the outputs (parallel) of a adc TI ADS5500 model, to an fpga cyclonev. The ADS5550 output is a cmos compatible. I should make a custom mezzanine card with HSMC connector. The question is: In the PCB i must use 50 ohm traces to connect adc outputs to fpga inputs? I need 50 ohms terminations to the end of lines (near the fpga?) Best regards, Luca.2 Replies
Altera_ForumNo, you don't need to route using 50 Ohm traces. However, do your best to length match the clock and data traces.
As you mention, the ADC output signals are CMOS compatible, 3.3V logic. Simply connect them to a suitably powered bank of your Cyclone V - 3.3V/3.0V/2.5V to accept 3.3V logic. Any logic signals driven to the ADC (OE or the serial interface if used) will need to come from a 3.3V powered bank. Cheers, Alex- Altera_Forum
ok thank you!
--- Quote Start --- No, you don't need to route using 50 Ohm traces. However, do your best to length match the clock and data traces. As you mention, the ADC output signals are CMOS compatible, 3.3V logic. Simply connect them to a suitably powered bank of your Cyclone V - 3.3V/3.0V/2.5V to accept 3.3V logic. Any logic signals driven to the ADC (OE or the serial interface if used) will need to come from a 3.3V powered bank. Cheers, Alex --- Quote End ---
