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CDC421A250 Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części CDC421A250
Szczegółowy opis  Fully-Integrated, Fixed-Frequency, Low-Jitter Crystal Oscillator Clock Generator
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

CDC421A250 Arkusz danych(HTML) 1 Page - Texas Instruments

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1
FEATURES
APPLICATIONS
DESCRIPTION
Crystal
Oscillator
Input
Feedback
Divider
LoopFilter
VCO
External
Crystal
CLK
NCLK
CDC421AXXX
www.ti.com ....................................................................................................................................................................................................... SCAS875 – MAY 2009
Fully-Integrated, Fixed-Frequency, Low-Jitter
Crystal Oscillator Clock Generator
• Low-Cost, Low-Jitter Frequency Multiplier
2
• Single 3.3-V Supply
• High-Performance Clock Generator,
Incorporating Crystal Oscillator Circuitry with
Integrated Frequency Synthesizer
The
CDC421Axxx
is
a
high-performance,
low-phase-noise clock generator. It has an integrated
• Low Output Jitter: As low as 380 fs (RMS
low-noise,
LC-based
voltage-controlled
oscillator
integrated between 10 kHz to 20 MHz)
(VCO) that operates within the 1.75 GHz to 2.35 GHz
• Low Phase Noise at 312.5 MHz:
frequency range. It has an integrated crystal oscillator
Less than –120 dBc/Hz at 10 kHz and
that operates in conjunction with an external AT-cut
–147 dBc/Hz at 10-MHz offset from carrier
crystal to produce a stable frequency reference for a
phase-locked
loop
(PLL)-based
frequency
• Supports Crystal or LVCMOS Input
synthesizer.
The
output
frequency
(fOUT)
is
Frequencies at 31.25 MHz, 33.33 MHz, and
proportional to the frequency of the input crystal
35.42 MHz
(fXTAL).
• Output Frequencies: 100 MHz, 106.25 MHz,
The device operates in 3.3-V supply environment and
125 MHz, 156.25 MHz, 212.5 MHz, 250 MHz, and
is characterized for operation from –40°C to +85°C.
312.5 MHz
The CDC421Axxx is available in a QFN-24 4-mm ×
• Differential Low-Voltage Positive Emitter
4-mm package.
Coupled Logic (LVPECL) Outputs
The CDC421Axxx differs from the CDC421xxx in
• Fully-Integrated Voltage-Controlled Oscillator
the following ways:
(VCO): Runs from 1.75 GHz to 2.35 GHz
• Device Startup
• Typical Power Consumption: 300 mW
The CDC421Axxx has an improved startup circuit
• Chip Enable Control Pin
to enable correct operation for all power-supply
ramp times.
• Available in 4-mm × 4-mm QFN-24 Package
• ESD Protection Exceeds 2 kV (HBM)
• Industrial Temperature Range: –40°C to +85°C
CDC421Axxx
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
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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