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FEATURES

APPLICATIONS

OutputEnable/ProgrammingInterfaceandEEPROMforConfigurationSettings

Crystal

Oscillator

Input

Feedback

Divider

LoopFilter

VCO1

VCO2

Xtal

CE

Program

CLK

NCLK

CDCE421A

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Fully-Integrated, Wide Range, Low-Jitter

Crystal Oscillator Clock Generator

• Two Fully-Integrated Voltage-Controlled

Oscillators (VCO) Support Wide Output

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• Single Supply at 3.3 V for LVPECL or LVDS

Frequency Range

Operation

• Fully Integrated Programmable Loop Filter

• High-Performance Clock Multiplier,

Incorporating Crystal Oscillator Circuitry with

• Typical Power Consumption at 3.3 V:

Integrated Frequency Synthesizer

–

274 mW in LVDS mode

• Low Output Jitter: 380 fs RMS typical

–

250 mW in LVPECL mode

(from 10 kHz to 20 MHz)

• Chip Enable Control Pin

• Low Phase Noise at High Frequency (708-MHz

• Simple Serial Interface Allows Programming

LVPECL):

after Manufacturing

–

Typically –109 dBc/Hz at 10 kHz and

• Integrated On-Chip Nonvolatile Memory

–146dBc/Hz at 10 MHz from the carrier

(EEPROM) Stores Settings Without Applying

• Supports Crystal or LVCMOS Input

High Voltage

Frequencies from 27.35 MHz to 38.33 MHz

• Available in 4-mm × 4-mm QFN-24 Package

• Output Frequency Ranges from 10.9 MHz to

• ESD Protection Exceeds 2 kV (HBM)

766.7 MHz and from 875.2 MHz to 1175 MHz

• Industrial Temperature Range: –40°C to +85°C

• Low-Voltage Differential Signaling (LVDS)

Output, 100-

Ω Differential Off-Chip

Termination, 10.9-MHz to 400-MHz Frequency

• Low-Cost, High-Frequency Crystal Oscillator

Range

• Differential Low-Voltage Positive Emitter

Coupled Logic (LVPECL) Outputs, 10.9-MHz to

1.175-GHz Frequency Range

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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.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, 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.