CDCM9102_1209 Datasheet, PDF (1/20 Pages) Texas Instruments – Low-Noise Two-Channel 100-MHz Clock Generator

CDCM9102
www.ti.com
Low-Noise Two-Channel 100-MHz Clock Generator
Check for Samples: CDCM9102
SCAS922 – FEBRUARY 2012
FEATURES
1
•2 Integrated Low-Noise Clock Generator
Including PLL, VCO, and Loop Filter
• Two Low-Noise 100-MHz Clocks (LVPECL,
LVDS, or pair of LVCMOS)
– Support for HCSL Signaling Levels
(AC-Coupled)
– Typical Period Jitter: 21 ps pk-pk
– Typical Random Jitter: 510 fs
– Output Type Set by Pins
• Bonus Single-ended 25-MHz Output
• Integrated Crystal Oscillator Input Accepts
25-MHz Crystal
• Output Enable Pin Shuts Off Device and
Outputs.
• 5-mm × 5-mm QFN-32 Package
• ESD Protection Exceeds 2 kV HBM, 500 V CDM
• Industrial Temperature Range (–40°C to 85°C)
• 3.3-V Power Supply
APPLICATIONS
• Reference Clock Generation for PCI Express
Gen 1, Gen2, and Gen3
• General-Purpose Clocking
DESCRIPTION
The CDCM9102 is a low-jitter clock generator designed to provide reference clocks for communications
standards such as PCI Express™. The device is easy to configure and use. The CDCM9102 provides two
100-MHz differential clock ports. The output types supported for these ports include LVPECL, LVDS, or a pair of
LVCMOS buffers. HCSL signaling is supported using an ac-coupled network. The user configures the output
buffer type desired by strapping device pins. Additionally, a single-ended 25-MHz clock output port is provided.
Uses for this port include general-purpose clocking, clocking Ethernet PHYs, or providing a reference clock for
additional clock generators. All clocks generated are derived from a single external 25-MHz crystal.
25 MHz
25 MHz
XO
CDCM9102
Low
Noise
Clock
Generator
PCIe 100 MHz
PCIe ^{100 MHz}
Figure 1. CDCM9102 Typical Application Example
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PCI Express is a trademark of PCI-SIG .
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated