We need to distribute a 3V p-p 10MHz clock to several devices.
We are considering using the LTC6957 + a clock buffer (i.e. CDCVF2310).
We are thinking of using a 10MHz crystal (i.e. ABM3BAIG) as the input into the LTC6957.
We noticed that on Page 34 of the LTC6957 datasheet, there is a Crystal Oscillator application example using a 10MHz crystal.
For this circuit, what is the input voltage? We see that the output is a 300mV p-p square wave.
Which component values in the circuit need to be adjusted to change the output voltage?
Do you have any input and output waveforms you can share for this circuit?
What are the benefits or drawbacks to perhaps using something like the LTC6908 instead?
For the 300mVpp square. The LTC6957 version used here was the CMOS output version (3.3V swing). The 0.3Vpp swing is created with the resistor divide using 450 ohm series resistor and the 50 ohm to GND termination.
The LTC6908 is a silicon oscillator, so its phase noise will not be as good as a crystal. Also its frequency error is spec'd at 1.5%. Crystals have less frequency error.
With that being said a silicon oscillator like the LTC6908 has great semiconductor reliability, temp range and are not prone to vibrations. The same can not be said for Crystal oscillators.
The AD9576, AD9508 or ADCLK846 maybe ADI options as replacements for the CDCVF2310 from our competitor.
Thanks Chris! Prior to your responses, I modified the design to use an ABM3BAIG 10MHz crystal, a SN74LVC1GX04 Clock Driver, and CDCVF2310 clock buffers. Will look into your recommedations of alternatives for the CDCVF2310.