CDC421XXX Datasheet, PDF (1/18 Pages) Texas Instruments – FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK GENERATOR

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CDC421xxx
SLAS540 – APRIL 2007
FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK
GENERATOR
FEATURES
• Single 3.3 V Supply
• High-Performance Clock Generator,
Incorporating Crystal Oscillator Circuitry With
Integrated Frequency Synthesizer
• Low Output Jitter, as Low as 380 fs (rms
integrated between 10 kHz–20 MHz)
• Low Phase Noise at 312.5 MHz, Less Than
–120 dBc/Hz at 10 kHz and –147 dBc/Hz at 10
MHz Offset From the Carrier
• Supports Crystal Frequencies or LVCMOS
Input Frequencies at 31.25 MHz, 33.33 MHz,
and 35.42 MHz
A
A
A
A
• Output Frequencies: 100 MHz, 106.25 MHz,
125 MHz, 156.25 MHz, 212.5 MHz, 250 MHz,
and 312.5 MHz
• Differential Low-Voltage Positive Emitter
Coupled Logic (LVPECL) Output
• Fully Integrated Voltage-Controlled Oscillator
(VCO) Running from 1.75 GHz to 2.35 GHz
• Typical Power Consumption 300 mW
• Chip-Enable Control Pin
• QFN-24 Package
• ESD Protection Exceeds 2 kV HBM
• Industrial Temperature Range –40°C to 85°C
APPLICATIONS
• Low-Cost, Low-Jitter Frequency Multiplier
External Crystal
Loop Filter
Crystal
Oscillator
Input
CLK
Feedback
Divider
VCO
NCLK
B0216-02
DESCRIPTION
CDC421xxx is a high-performance, low-phase-noise clock generator. It has an integrated low-noise, LC-based
voltage-controlled oscillator (VCO) that operates within the 1.75 GHz–2.35 GHz frequency range. It has an
integrated crystal oscillator that operates in conjunction with an external AT-cut crystal to produce a stable
frequency reference for the PLL-based frequency synthesizer. The output frequency (f_out) is proportional to the
frequency of the input crystal (f_xtal).
The device operates in a 3.3 V supply environment and is characterized for operation from –40°C to 85°C.
CDC421xxx is available in a QFN-24 package.
A high-level block diagram of the CDC421xxx is shown in Figure 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.
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 © 2007, Texas Instruments Incorporated