Datasheet > 844N255I

844N255I

更新时间： 2024-09-26 01:12:39

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
22页	697K
描述
FemtoClock NG Crystal-to-LVDS Clock Synthesizer

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844N255I 数据手册

FemtoClock® NG Crystal-to-LVDS

Clock Synthesizer

844N255I

Data Sheet

General Description

Features

The 844N255I is a 6-output clock synthesizer designed for wireless

infrastructure clock applications. The device uses IDT’s fourth

generation FemtoClock® NG technology for an optimum of high

clock frequency and low phase noise performance, combined with a

low power consumption and high power supply noise rejection. The

reference frequency is selectable and the following frequency is

supported: 25MHz. The synthesizer generates selectable

156.25MHz, 125MHz, 100MHz, 50MHz and 25MHz clock signals.

The device is optimized for very low phase noise and cycle to cycle

jitter. The synthesized clock frequency and the phase-noise

performance are optimized for driving SRIO 1.3 and 2.0 SerDes

reference, DSP and host-processor clocks. The device supports a

2.5V voltage supply and is packaged in a small, lead-free (RoHS 6)

48-lead VFQFN package. The extended temperature range supports

wireless infrastructure, telecommunication and networking end

equipment requirements.

• 4^THgeneration FemtoClock® NG technology

• Selectable 156.25MHz, 125MHz, 100MHz, 50MHz and 25MHz

output clock signals synthesized from a 25MHz reference

frequency

• Six differential LVDS clock outputs

• Crystal interface designed for a 25MHz crystal

• RMS phase jitter @ 156.25MHz, using a 25MHz crystal

(1MHz - 20MHz): 0.27ps (typical)

• Internal regulator for optimum noise rejection

• LVCMOS interface levels for the frequency select and output

enable inputs

• Full 2.5V supply voltage

• Lead-free (RoHS 6) 48-lead VFQFN package

• -40°C to 85°C ambient operating temperature

Block Diagram

XTAL_IN

25MHz

OSC

PFD

FemtoClock® NG

VCO

÷16

nQA

XTAL_OUT

25MHz

Pulldown

÷20,

÷25

÷M

QB0

Pulldown

÷20,

÷25

nQB0

REF_CLK

÷50,

÷100

QB1

nQB1

Pulldown

Pullup

REF_SEL

MSEL

÷50

Pulldown

Pullup

÷100

nQC

Pulldown

FSELB

FSELC

FSELD

April 28, 2016

12 3 4 5 6 7...22

中文翻译

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