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Part Number: LMK61E07
I've noticed that the phase noise of the LMK61E07 is not as good as it was when I2C operations taken place.
I've tried periodically sending commands to change the LMK61E07 frequency or sending command just to read the product ID, or sending non-I2C PRN data to the I2C ports on the chip.
All the above three significantly worsen the phase noise of the LMK61E07 at the sideband related to the I2C port's communication.
Please see the following figure attached.
In reply to Weida Zhang:
Based on your config above, it looks like...You are using LVDS instead of LVPECL, and the PLL settings are what I produced with the LMK61E2 GUI. Particularly using a different VCO frequency, fractional mode, and 1.6 mA instead of 6.4 mA.Please try this configuration attached, registers for reference:
R0 0x0010R1 0x010BR2 0x0233R8 0x08B0R9 0x0901R16 0x1000R17 0x1180R21 0x1501R22 0x1600R23 0x1728R25 0x1900R26 0x1A32R27 0x1B00R28 0x1C00R29 0x1D00R30 0x1E00R31 0x1F00R32 0x2001R33 0x210CR34 0x2228R35 0x2303R36 0x2408R37 0x2500R38 0x2600R39 0x2700R47 0x2F00R48 0x3000R49 0x3110R50 0x3200R51 0x3300R52 0x3400R53 0x3500R56 0x3800R72 0x4802
More information Clock and Timing System products: http://www.ti.com/clock-and-timing/overview.html
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