Datasheet > CDC421125RGET

CDC421125RGET

更新时间： 2024-11-13 03:53:31

品牌	Logo	应用领域
德州仪器 - TI		振荡器晶体振荡器时钟发生器
页数	文件大小	规格书
18页	695K
描述
FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK GENERATOR

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CDC421125RGET 数据手册

CDC421xxx

www.ti.com

SLAS540–APRIL 2007

FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK

GENERATOR

FEATURES

•

Output Frequencies: 100 MHz, 106.25 MHz,

125 MHz, 156.25 MHz, 212.5 MHz, 250 MHz,

and 312.5 MHz

•

Single 3.3 V Supply

•

High-Performance Clock Generator,

Incorporating Crystal Oscillator Circuitry With

Integrated Frequency Synthesizer

•

Differential Low-Voltage Positive Emitter

Coupled Logic (LVPECL) Output

Fully Integrated Voltage-Controlled Oscillator

(VCO) Running from 1.75 GHz to 2.35 GHz

•

Low Output Jitter, as Low as 380 fs (rms

integrated between 10 kHz–20 MHz)

•

Typical Power Consumption 300 mW

Chip-Enable Control Pin

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

QFN-24 Package

•

Supports Crystal Frequencies or LVCMOS

ESD Protection Exceeds 2 kV HBM

Industrial Temperature Range –40°C to 85°C

Input Frequencies at 31.25 MHz, 33.33 MHz,

and 35.42 MHz

APPLICATIONS

•

Low-Cost, Low-Jitter Frequency Multiplier

External Crystal

Loop Filter

Crystal

Oscillator

Input

CLK

VCO

Feedback

Divider

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 AT-cut crystal to produce a stable

frequency reference for the PLL-based frequency synthesizer. The output frequency (f_out) is proportional to the

frequency of the input crystal (f_xtal).

The device operates in a 3.3 V supply environment and is characterized for operation from –40°C to 85°C.

CDC421xxx is available in a QFN-24 package.

A high-level block diagram of the CDC421xxx is shown in Figure 1.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...18

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