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Hello,
For digital interface (da0-da11) to FPGA, should I consider any pcb trace impedance control? 50 ohm or 100ohm?
Hi Shen,
If you are using the ADS4222 with a CMOS output, then the PCB trace impedance should be 50 ohm references.
I would also include a series termination of 100 ohm to help reduce the transient currents that go along with the single-ended CMOS outputs. This series resistance should be located near the ADC’s outputs.
If you plan to use the LVDS output format, then the trace impedance should be 100 ohm differential referred. Also, please place a 100 ohm differential termination close to the FPGA receiver input pins.
For more on terminations and trace impedances please see the following references:
Regards,
Amy
I am using CMOS output. So the CLKOUT should take the same as DA0...11 pin, add 100 ohm serial resistor, right?