2.25 GHz clock generation with integrated PLL
The AD9520-3BCPZ-REEL7 is a clock generator and fanout distribution IC from Analog Devices, integrating a PLL to synthesize and distribute low-jitter clocks up to 2.25 GHz. This makes it a fit for high-speed ADC/DAC clocking, RF sampling, and base station local oscillator generation where the output frequency must be clean and stable. It accepts CMOS, LVDS, or LVPECL reference inputs and delivers CMOS or LVPECL outputs with a 2:24 input-to-output ratio — meaning you can fan out one reference to 24 clock loads, or use the second input for redundancy switching.
Supply voltage and package constraints
The 64-VFQFN exposed-pad CSP requires a thermal pad on the PCB; the datasheet's recommended land pattern for the 64-LFCSP-VQ (9x9) should be followed closely to avoid ground bounce and thermal issues. All inputs and outputs are differential-capable, which helps maintain signal integrity over longer board traces and reduces common-mode noise coupling into the clock tree.