CDC421A250 - 完全集成的固定频率低抖动晶振时钟发生器

CDC421A250是TI德州仪器公司的一款通用产品，CDC421A250是完全集成的固定频率低抖动晶振时钟发生器，本站介绍了CDC421A250的封装应用图解、特点和优点、功能等，并给出了与CDC421A250相关的TI元器件型号供参考。

CDC421A250 - 完全集成的固定频率低抖动晶振时钟发生器 - 通用 - 时钟发生器 - 德州仪器

产品描述

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 (fOUT) is proportional to the frequency of the input crystal (fXTAL).

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.

产品特性

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
APPLICATIONS
- Low-Cost, Low-Jitter Frequency Multiplier

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