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CDC421A312 PDF预览

CDC421A312

更新时间: 2024-11-23 12:42:59
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德州仪器 - TI 时钟发生器
页数 文件大小 规格书
15页 619K
描述
Fully-Integrated, Fixed-Frequency, Low-Jitter Crystal Oscillator Clock Generator

CDC421A312 数据手册

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CDC421AXXX  
www.ti.com ....................................................................................................................................................................................................... SCAS875MAY 2009  
Fully-Integrated, Fixed-Frequency, Low-Jitter  
Crystal Oscillator Clock Generator  
1
FEATURES  
APPLICATIONS  
Low-Cost, Low-Jitter Frequency Multiplier  
2
Single 3.3-V Supply  
High-Performance Clock Generator,  
Incorporating Crystal Oscillator Circuitry with  
Integrated Frequency Synthesizer  
DESCRIPTION  
The  
CDC421Axxx  
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 to 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 a  
Low Output Jitter: As low as 380 fs (RMS  
integrated between 10 kHz to 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 carrier  
phase-locked  
synthesizer. The output frequency (fOUT  
proportional to the frequency of the input crystal  
(fXTAL).  
loop  
(PLL)-based  
frequency  
is  
Supports Crystal or LVCMOS Input  
Frequencies at 31.25 MHz, 33.33 MHz, and  
35.42 MHz  
)
Output Frequencies: 100 MHz, 106.25 MHz,  
125 MHz, 156.25 MHz, 212.5 MHz, 250 MHz, and  
312.5 MHz  
The device operates in 3.3-V supply environment and  
is characterized for operation from –40°C to +85°C.  
The CDC421Axxx is available in a QFN-24 4-mm ×  
4-mm package.  
Differential Low-Voltage Positive Emitter  
Coupled Logic (LVPECL) Outputs  
The CDC421Axxx differs from the CDC421xxx in  
the following ways:  
Fully-Integrated Voltage-Controlled Oscillator  
(VCO): Runs from 1.75 GHz to 2.35 GHz  
Device Startup  
Typical Power Consumption: 300 mW  
Chip Enable Control Pin  
The CDC421Axxx has an improved startup circuit  
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  
Loop Filter  
Crystal  
Oscillator  
Input  
CLK  
External  
Crystal  
VCO  
Feedback  
Divider  
NCLK  
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.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2009, Texas Instruments Incorporated  

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