i am using a 20 MHz TCXO as ref clk input, TCXO output impedance is 10K ,i am using single ended configuration for ref clk please suggest the proper value of resistors & configuration
Are you referring to the capacitor configuration? If you are referring to it, two 39pf capacitors is being recommended by the datasheet but it would be best if you would use a 25MHz clock when using the crystal clock.
i am referring fig no 49 of datasheet, it assumes source clock impedance is 50 ohm but in my case it is 10K .so please suggest the right value of component for single ended config.
Figure 49 is a reference circuit for direct driven clocks. This means that this circuit will be used for signal generator sources and not for crystal clocks thus XTAL_SEL would be left unused and is grounded. A TCXO with a 10K ohm input impedance would still be enough to drive the 2.4K ohm from AD9957 as long as the voltage levels that is specified by the data sheet is satisfied. So you can still use the TCXO without using any resistor configurations.
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