GENERAL DESCRIPTION
The 9DB202 is a high perfromance 1-to-2 Differential-to-HCSL
Jitter Attenuator designed for use in PCI Express™ systems. In
some PCI Express™ systems, such as those found in desktop PCs,
the PCI Express™ clocks are generated from a low bandwidth,
high phase noise PLL frequency synthesizer. In these systems, a
jitter-attenuating device may be necessary in order to reduce high
frequency random and deterministic jitter components from the PLL
synthesizer and from the system board. The 9DB202 has two PLL
bandwidth modes. In low bandwidth mode, the PLL loop bandwidth
is 500kHz. This setting offers the best jitter attenuation and is still
high enough to pass a triangular input spread spectrum profi le. In
high bandwidth mode, the PLL bandwidth is at 1MHz and allows
the PLL to pass more spread spectrum modulation.
For serdes which have x10 reference multipliers instead of x12.5
multipliers, each of the two PCI Express™ outputs (PCIEX0:1) can
be set for 125MHz instead of 100MHz by confi guring the appropriate
frequency select pins (FS0:1).

FEATURES
• Two 0.7V current mode differential HCSL output pairs
• One differential clock input
• CLK and nCLK supports the following input types:
LVPECL, LVDS, LVHSTL, SSTL, HCSL
• Maximum output frequency: 140MHz
• Input frequency range: 90MHz - 140MHz
• VCO range: 450MHz - 700MHz
• Output skew: 110ps (maximum)
• Cycle-to-cycle jitter: 110ps (maximum)
• RMS phase jitter @ 100MHz, (1.5MHz - 22MHz):
2.42ps (typical)
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Available in lead-free RoHS compliant package
• Industrial temperature information available upon request
• For functional replacement use 8714004