Description:The 9DB233 zero-delay buffer supports PCIe Gen3 requirements, while being backwards compatible to PCIe Gen2 and Gen1. The 9DB233 is driven by a differential SRC output pair from an IDT 932S421 or 932SQ420 or equivalent main clock generator. It attenuates jitter on the input clock and has a selectable PLL bandwidth to maximize performance in systems with or without Spread-Spectrum clocking. An SMBus interface allows control of the PLL bandwidth and bypass options, while 2 clock request (OE#) pins make the 9D
Renesas provides a recommended PCB layout guide in their application note (APL-AN-1201) for thermal management. It suggests using a 4-layer PCB with a thermal relief pattern, and placing the device near a thermal pad or heat sink.
Renesas recommends following their thermal design guidelines, using a heat sink or thermal pad, and ensuring good airflow around the device. Additionally, consider using a thermal interface material (TIM) to improve heat transfer.
Renesas recommends using a low-ESR ceramic capacitor (e.g., X5R or X7R) for CIN, with a value between 4.7uF to 10uF. For COUT, use a low-ESR ceramic or electrolytic capacitor with a value between 10uF to 22uF. Ensure the capacitors meet the specified voltage and ripple current ratings.
Renesas suggests following their EMI reduction guidelines, which include using a solid ground plane, minimizing trace lengths, and placing the device away from noise sources. Additionally, consider using shielding or a metal can to reduce radiated emissions.
Renesas recommends using a pi-filter (L-C-L) or a T-filter (L-C-R-L) for input voltage filtering, with a cutoff frequency around 1MHz to 10MHz. For output voltage filtering, use a simple RC filter or a more complex filter like a 3rd-order LC filter, depending on the specific application requirements.
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9DB233AGILF Overview
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