CDC421250

www.ti.com 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 PFD/Charge Pump Prescaler Output Divider LVPECL 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 A...