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.
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
