The LMK04816 device is the industrys highest performance clock conditioner with superior
clock jitter cleaning, generation, and distribution with advanced features to meet next generation
system requirements. The dual-loop PLLATINUM architecture enables 111-fs RMS jitter (12 kHz to
20 MHz) using a low-noise VCXO module or sub-200-fs RMS jitter (12 kHz to 20 MHz) using a
low-cost external crystal and varactor diode.
The dual-loop architecture consists of two high-performance phase-locked loops (PLL), a
low-noise crystal oscillator circuit, and a high-performance voltage controlled oscillator (VCO).
The first PLL (PLL1) provides a low-noise jitter cleaner function while the second PLL (PLL2)
performs the clock generation. PLL1 can be configured to either work with an external VCXO module
or the integrated crystal oscillator with an external tunable crystal and varactor diode. When used
with a very narrow loop bandwidth, PLL1 uses the superior close-in phase noise (offsets below 50
kHz) of the VCXO module or the tunable crystal to clean the input clock. The output of PLL1 is used
as the clean input reference to PLL2 where it locks the integrated VCO. The loop bandwidth of PLL2
can be optimized to clean the far-out phase noise (offsets above 50 kHz) where the integrated VCO
outperforms the VCXO module or tunable crystal used in PLL1.
The LMK04816 device is the industrys highest performance clock conditioner with superior
clock jitter cleaning, generation, and distribution with advanced features to meet next generation
system requirements. The dual-loop PLLATINUM architecture enables 111-fs RMS jitter (12 kHz to
20 MHz) using a low-noise VCXO module or sub-200-fs RMS jitter (12 kHz to 20 MHz) using a
low-cost external crystal and varactor diode.
The dual-loop architecture consists of two high-performance phase-locked loops (PLL), a
low-noise crystal oscillator circuit, and a high-performance voltage controlled oscillator (VCO).
The first PLL (PLL1) provides a low-noise jitter cleaner function while the second PLL (PLL2)
performs the clock generation. PLL1 can be configured to either work with an external VCXO module
or the integrated crystal oscillator with an external tunable crystal and varactor diode. When used
with a very narrow loop bandwidth, PLL1 uses the superior close-in phase noise (offsets below 50
kHz) of the VCXO module or the tunable crystal to clean the input clock. The output of PLL1 is used
as the clean input reference to PLL2 where it locks the integrated VCO. The loop bandwidth of PLL2
can be optimized to clean the far-out phase noise (offsets above 50 kHz) where the integrated VCO
outperforms the VCXO module or tunable crystal used in PLL1.