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TI(德州仪器) CDC421A250
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  • TI(德州仪器) CDC421A250
  • TI(德州仪器) CDC421A250
  • TI(德州仪器) CDC421A250
  • TI(德州仪器) CDC421A250
  • TI(德州仪器) CDC421A250
  • TI(德州仪器) CDC421A250
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CDC421A250

CDC421A250

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250MHz 全集成式固定频率低抖动晶振时钟发生器

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  • 封装 | 引脚 | 尺寸

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 phase-locked loop (PLL)-based frequency synthesizer. The output frequency (fOUT) is proportional to the frequency of the input crystal (fXTAL).

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.

The CDC421Axxx differs from the CDC421xxx in the following ways:

  • Device Startup
  • The CDC421Axxx has an improved startup circuit to enable correct operation for all power-supply ramp times.

  • 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 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
  • 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
  • Differential Low-Voltage Positive Emitter Coupled Logic (LVPECL) Outputs
  • Fully-Integrated Voltage-Controlled Oscillator (VCO): Runs from 1.75 GHz to 2.35 GHz
  • Typical Power Consumption: 300 mW
  • Chip Enable Control Pin
  • Available in 4-mm × 4-mm QFN-24 Package
  • ESD Protection Exceeds 2 kV (HBM)
  • Industrial Temperature Range: -40°C to +85°C
  • APPLICATIONS
    • Low-Cost, Low-Jitter Frequency Multiplier

All trademarks are the property of their respective owners.

FunctionClock generator
Number of outputs1
Output frequency (max) (MHz)250
Core supply voltage (V)3.3
Output supply voltage (V)3.3
Input typeLVCMOS
Output typeLVPECL
Operating temperature range (°C)-40 to 85
FeaturesChip-enable control pin, Signal 3.3-V supply
RatingCatalog
VQFN (RGE)2416 mm² 4 x 4
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