XO

Low

Noise

Clock

Generator

CDCM9102

PCIe

100 MHz

PCIe

25 MHz

25 MHz

100 MHz

CDCM9102

www.ti.com

SCAS922

– FEBRUARY 2012

Low-Noise Two-Channel 100-MHz Clock Generator

Check for Samples: CDCM9102

1

FEATURES

2

•

Integrated Low-Noise Clock Generator

•

Output Enable Pin Shuts Off Device and

Including PLL, VCO, and Loop Filter

Outputs.

•

Two Low-Noise 100-MHz Clocks (LVPECL,

•

5-mm

× 5-mm QFN-32 Package

LVDS, or pair of LVCMOS)

•

ESD Protection Exceeds 2 kV HBM, 500 V CDM

– Support for HCSL Signaling Levels

•

Industrial Temperature Range (

–40°C to 85°C)

(AC-Coupled)

•

3.3-V Power Supply

– Typical Period Jitter: 21 ps pk-pk

– Typical Random Jitter: 510 fs

APPLICATIONS

– Output Type Set by Pins

•

Reference Clock Generation for PCI Express

Gen 1, Gen2, and Gen3

•

Bonus Single-ended 25-MHz Output

•

General-Purpose Clocking

•

Integrated Crystal Oscillator Input Accepts

25-MHz Crystal

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.

Figure 1. CDCM9102 Typical Application Example

1

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.

2

PCI Express is a trademark of PCI-SIG .

PRODUCTION DATA information is current as of publication date.

Copyright

© 2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.