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Question asked by harrycheung on Feb 13, 2013

On the DDS chip AD9910, pin 94 is a REFCLK_OUT.It is a current output and its output current can be controlled 2 bits,DRV0 Bits (CFR3[29:28]). The datasheet does not specify its range of output, what is the range of the expected output current of this pin?


I am building my own circuit with the DDS, but the schematic of the evaluation board does not show how it should be connected. Should I connect  pin 94 directly to output or do I need to bypass capacitor/resistor? If I am not using the REFCLK_OUT, can it be left float or grounded, or must it connect to some other circuits?