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ADSP-SC589_EZ-Board Analog input noise

I have a ADSP-SC589_EZ-Board, and I am using it with SigmaStudio for SHARC 4.6 and CCES 2.10.0, Windows 10.

I notice that I get a 3kHz noise signal with harmonics when I connect a source with a finite output impedance. In fact, as soon as I connect a dummy source (simply a connector with an impedance of 600 Ohms between pin and GND) to the analog inout I get this noise signal.  The signal level is equivalent to 1mV p-p. This gives me a maximum S/N ratio of 50dB, which is not impressive, and it is not enough for my application as it is very specific and clearly audible. White noise would have been more acceptable.

Is this known, or is there something wrong with my EZ board?

Is there any way I can improve the situation?


correction of misspell
[edited by: bnilsson at 3:23 PM (GMT -4) on 20 Sep 2021]
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