LMX2595: Can I use CMOS reference signal for LMX2595?

Hi Anupama,

CMOS, sine wave or any other single-ended clock are acceptable as long as the voltage swing and frequency meet datasheet requirement. 

The phase noise and slew rate of the reference clock affect PLL noise. A 10MHz sine wave clock is a bad reference clock even if its phase noise is good because slew rate is very bad. For low frequency reference clock, use CMOS or differential clock. At higher frequency, for example, 100MHz, sine wave, square wave or differential clock make no significant difference to the PLL noise.