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Hello,
Our customer use the ADS4142, with parallel CMOS mode.
The customer connect a capacitance (less than 10pF) between CLKOUTP and GND
to reduce output noise.
When the customer remove this capacitance, there are a lot of noise on the output signal.
Is it possible to connect a capacitance? or not recommend?
Best Regards,
Naoki Aoyama
Naoki,
What is the CLKOUT driving? How long is this trace? There is a good chance you are seeing reflections on this trace. If possible, can you place a series resistor around 22.1 Ohms as close as possible to the ADC? Another option is to add termination at the load. The EVM uses a buffer device between the ADC and the output connector. This is another option.
Regards,
Jim