Datasheet > ICS874002AG

ICS874002AG

更新时间： 2024-09-28 21:55:39

品牌	Logo	应用领域
矽成 - ICSI		衰减器 PC
页数	文件大小	规格书
10页	208K
描述
PCI EXPRESS JITTER ATTENUATOR

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中文翻译

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数据手册

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ICS874002AG 数据手册

PRELIMINARY

ICS874002

Integrated

Circuit

Systems, Inc.

PCI EXPRESS

™

ITTER

ATTENUATOR

GENERAL DESCRIPTION

FEATURES

The ICS874002 is a high performance Differential- • (2) Differential LVDS output pairs

ICS

to-LVDS Jitter Attenuator designed for use in PCI

• (1) Differential clock input

HiPerClockS™

Express™ systems. In some PCI Express™

systems, such as those found in desktop PCs,

the PCI Express™ clocks are generated from a

• CLK and nCLK supports the following input types:

LVPECL, LVDS, LVHSTL, SSTL, HCSL

low bandwidth, high phase noise PLL frequency synthesizer.

In these systems, a jitter attenuator may be required to

attenuate high frequency random and deterministic jitter

components from the PLL synthesizer and from the system

board. The ICS874002 has 3 PLL bandwidth modes:

200KHz, 400KHz, and 800KHz. The 200KHz mode will pro-

vide maximum jitter attenuation, but with higher PLL tracking

skew and spread spectrum modulation from the motherboard

synthesizer may be attenuated. 400KHz provides an

intermediate bandwidth that can easily track triangular

spread profiles, while providing good jitter attenuation.

800KHz bandwidth provides the best tracking skew and will

pass most spread profiles, but the jitter attenuation will not be

as good as the lower bandwidth modes. Because some 2.5

Gb serdes have x20 multipliers while others have than x25

multipliers, the 874002 can be set for 1:1 mode or 5/4

multiplication mode (i.e. 100MHz input/125MHz output) using

the F_SEL pin.

• Output frequency range: 98MHz - 160MHz

• Input frequency range: 98MHz - 128MHz

• VCO range: 490MHz - 640MHz

• Cycle-to-cycle jitter: 50ps (maximum) design target

• 3.3V operating supply

• 3 bandwidth modes allow the system designer to make jitter

attenuation/tracking skew design trade-offs

• 0°C to 70°C ambient operating temperature

PLL BANDWIDTH

The ICS874002 uses ICS 3^rdGeneration FemtoClock^TM

PLL technology to achieve the lowest possible phase noise.

The device is packaged in a 20 Lead TSSOP package, making

it ideal for use in space constrained applications such as PCI

Express™ add-in cards.

BW_SEL

0 = PLL Bandwidth: ~200KHz

Float = PLL Bandwidth: ~400KHz (Default)

1 = PLL Bandwidth: ~800KHz

BLOCK DIAGRAM

PIN ASSIGNMENT

nQA0

VDDO

QA0

V^DDO

QA1

nQA1

F_SEL

Float

BW_SEL

0 = ~200KHz

Float = ~400KHz

FB_OUT

nFB_OUT

nFB_IN

FB_IN

GND

nCLK

CLK

BW_SEL

V^DDA

F_SEL

QA0

1 = ~800KHz

÷5

(default)

CLK

nQA0

QA1

÷4

Phase

Detector

VCO

490 - 640 MHz

nCLK

FB_IN

V^DD

nQA1

ICS874002

20-LeadTSSOP

nFB_IN

÷5 (fixed)

6.5mm x 4.4mm x 0.92mm

package body

FB_OUT

nFB_OUT

G Package

Top View

The Preliminary Information presented herein represents a product in prototyping or pre-production.The noted characteristics are based on initial

product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.

874002AG

www.icst.com/products/hiperclocks.html

REV. A JANUARY 19, 2005

12 3 4 5 6 7...10

中文翻译

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与ICS874002AG相关器件

型号	品牌	获取价格	描述	数据表
ICS874002AG-02	IDT	获取价格	PLL Based Clock Driver, 874002 Series, 2 True Output(s), 0 Inverted Output(s), PDSO20, 4.4
ICS874002AG-02LF	IDT	获取价格	PLL Based Clock Driver, 874002 Series, 2 True Output(s), 0 Inverted Output(s), PDSO20, 4.4
ICS874002AG-02T	IDT	获取价格	PLL Based Clock Driver, 874002 Series, 2 True Output(s), 0 Inverted Output(s), PDSO20, 4.4
ICS874002AGLF	IDT	获取价格	PLL Based Clock Driver, 874002 Series, 2 True Output(s), 0 Inverted Output(s), PDSO20, 6.5
ICS874002AGLFT	IDT	获取价格	PLL Based Clock Driver, 874002 Series, 2 True Output(s), 0 Inverted Output(s), PDSO20, 6.5
ICS874002AGT	ICSI	获取价格	PCI EXPRESS JITTER ATTENUATOR
ICS874002AGT	IDT	获取价格	PLL Based Clock Driver, 874002 Series, 2 True Output(s), 0 Inverted Output(s), PDSO20, 6.5
ICS874003	ICSI	获取价格	PCI EXPRESS JITTER ATTENUATOR
ICS874003-02	IDT	获取价格	PCI EXPRESS⑩ JITTER ATTENUATOR
ICS874003-04	IDT	获取价格	PCI EXPRESS? Jitter Attenuator

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