CDC421A100 Datasheet | Texas Instruments

FEATURES - 2 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 k Hz to 20 MHz) - Low Phase Noise at 312.5 MHz: - Less than - 120 d Bc/Hz at 10 k Hz and - 147 d Bc/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 m W - Chip Enable Control Pin - Available in 4-mm × 4-mm QFN-24 Package - ESD Protection Exceeds 2 k V (HBM) - Industrial Temperature Range: - 40°C to +85°C APPLICATIONS - Low-Cost, Low-Jitter Frequency Multiplier 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 phase-locked loop (PLL)-based frequency synthesizer. The output frequency (f OUT) is proportional to the frequency of the input crystal (f XTAL). 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. External Crystal Crystal Oscillator Input Feedback Divider Loop Filter VCO PFD/Charge Pump Prescaler Output Divider LVPECL CLK NCLK CDC421Axxx Please be aware that an important notice...