CDC421A156

更新时间： 2024-11-05 12:42:59

品牌	Logo	应用领域
德州仪器 - TI		时钟发生器
页数	文件大小	规格书
15页	619K
描述
Fully-Integrated, Fixed-Frequency, Low-Jitter Crystal Oscillator Clock Generator

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CDC421A156 数据手册

CDC421AXXX

www.ti.com ....................................................................................................................................................................................................... SCAS875–MAY 2009

Fully-Integrated, Fixed-Frequency, Low-Jitter

Crystal Oscillator Clock Generator

FEATURES

APPLICATIONS

•

Low-Cost, Low-Jitter Frequency Multiplier

•

Single 3.3-V Supply

•

High-Performance Clock Generator,

Incorporating Crystal Oscillator Circuitry with

Integrated Frequency Synthesizer

DESCRIPTION

The

CDC421Axxx

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

•

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

phase-locked

synthesizer. The output frequency (f_OUT

proportional to the frequency of the input crystal

(f_XTAL).

loop

(PLL)-based

frequency

•

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

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.

•

Differential Low-Voltage Positive Emitter

Coupled Logic (LVPECL) Outputs

The CDC421Axxx differs from the CDC421xxx in

the following ways:

Fully-Integrated Voltage-Controlled Oscillator

(VCO): Runs from 1.75 GHz to 2.35 GHz

•

Device Startup

•

Typical Power Consumption: 300 mW

Chip Enable Control Pin

The CDC421Axxx has an improved startup circuit

to enable correct operation for all power-supply

ramp times.

Available in 4-mm × 4-mm QFN-24 Package

ESD Protection Exceeds 2 kV (HBM)

Industrial Temperature Range: –40°C to +85°C

Loop Filter

Crystal

Oscillator

Input

CLK

External

Crystal

VCO

Feedback

Divider

NCLK

CDC421Axxx

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.

All trademarks are the property of their respective owners.

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...15

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CDC421A250RGET	TI	获取价格	Fully-Integrated, Fixed-Frequency, Low-Jitter Crystal Oscillator Clock Generator
CDC421A312	TI	获取价格	Fully-Integrated, Fixed-Frequency, Low-Jitter Crystal Oscillator Clock Generator
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