Datasheet Texas Instruments CDC421A125

CDC421AXXX
www.ti.com . SCAS875 – MAY 2009 Fully-Integrated, Fixed-Frequency, Low-Jitter
Crystal Oscillator Clock Generator
FEATURES APPLICATIONS 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 1 2 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 …