The PCIe REF PLL addresses stringent performance requirements in high-speed serial link applications that support the PCI Express Gen4 and Gen5 serial bus standard where SRIS (Separate RefClk Independent Spread-spectrum clock generation) is required. This SSCG PLL is designed for digital logic processes and uses robust design techniques to work in noisy SoC environments.
The PLL macro is implemented in Analog Bits’ proprietary architecture that uses core and 1.2V IO devices.
With all components integrated, jitter performance and standby-power are significantly improved.
SSCG PLL Operational Range Description Symbol Min Typ Max Units Input Frequency FREF 24 40 100 MHz Input Frequency in Bypass Mode fBYPASS 24 161.1328125 MHz VCO Frequency FVCO 14400 15000 MHz Output Frequency FOUT 100 156.25 161.1328125 MHz Output Duty Cycle tDO 48 52 % Lock Time tLOCK 15 µs Reset Time tRESET 1 µs PLLOUT Random Filtered Phase Jitter RJPO,FILT 0.15 ps-RMS Modulation Frequency FM 30 33 kHz Modulation Depth (down-spread) DMD -5000 -1000 ppm Loop Bandwidth LBW 0.5 2 MHz Area A 0.083 sq. mm Operational Power PDIG +PANA 15 25 mW Output Load CL 100 fF Operational Voltage (Digital) VDIG 0.675 0.75 0.825 V Operational Voltage (Analog) VANA 1.14 1.2 1.32 V Operational Temperature TOP -40 25 125 C