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FEATURES
APPLICATIONS
OutputEnable/ProgrammingInterfaceandEEPROMforConfigurationSettings
Crystal
Oscillator
Input
Feedback
Divider
PFD/ChargePump
LoopFilter
VCO1
VCO2
Prescaler
OutputDivider
LVPECLorLVDS
Xtal
CE
Program
CLK
NCLK
CDCE421A
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..................................................................................................................................................................................................... SCAS873 – APRIL 2009
Fully-Integrated, Wide Range, Low-Jitter
Crystal Oscillator Clock Generator
• Two Fully-Integrated Voltage-Controlled
Oscillators (VCO) Support Wide Output
2
• 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.
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