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Fixed-Output, Low-Jitter Clock Generator
Texas Instruments
Description
CDC421 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 (fout) is proportional to the frequency of the input crystal (fxtal).The device operates in a 3.3 V supply environment and is characterized for operation from -40°C to 85°C. CDC421 is available in a QFN-24 package.
Features
Single 3.3 V SupplyHigh-Performance Clock Generator, Incorporating Crystal Oscillator Circuitry With Integrated Frequency SynthesizerLow 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 CarrierSupports Crystal Frequencies or LVCMOS Input Frequencies at 31.25 MHz, 33.33 MHz, and 35.42 MHzOutput Frequencies: 100 MHz, 106.25 MHz, 125 MHz, 156.25 MHz, 212.5 MHz, 250 MHz, and 312.5 MHzDifferential Low-Voltage Positive Emitter Coupled Logic (LVPECL) OutputFully Integrated Voltage-Controlled Oscillator (VCO) Running from 1.75 GHz to 2.35 GHz Typical Power Consumption 300 mW Chip-Enable Control PinQFN-24 PackageESD Protection Exceeds 2 kV HBMIndustrial Temperature Range -40°C to 85°CAPPLICATIONSLow-Cost, Low-Jitter Frequency Multiplier
Related Datasheets
| Part Number | Description | Category |
| • CDC421106 | Fixed-Output, Low-Jitter Clock Generator | Clock |
| • CDC421125 | Fixed-Output, Low-Jitter Clock Generator | Clock |
| • CDC421250 | Fixed-Output, Low-Jitter Clock Generator | Clock |
| • CDCE421 | Fully Integrated Wide Range Low-Jitter Crystal Oscillator Clock Generator (Rev. A) | Clock |
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