Datasheet > ICS44002AI01

ICS44002AI01

更新时间： 2024-11-14 11:14:27

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
12页	161K
描述
FEMTOCLOCKS? CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

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ICS44002AI01 数据手册

ICS844002I-01

FEMTOCLOCKS™ CRYSTAL-TO-

LVDS FREQUENCY SYNTHESIZER

Integrated

Circuit

Systems, Inc.

GENERAL DESCRIPTION

FEATURES

The ICS844002I-01 is a 2 output LVDS • Two LVDS outputs

Synthesizer optimized to generate Ethernet

ICS

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

HiPerClockS™

reference clock frequencies and is a mem-

ber of the HiPerClocks^TMfamily of high

performance clock solutions from ICS. Using a

• Supports the following output frequencies: 156.25MHz,

125MHz, 62.5MHz

25MHz, 18pF parallel resonant crystal, the following

frequencies can be generated based on the 2 frequency

select pins (F_SEL[1:0]): 156.25MHz, 125MHz and

62.5MHz. The ICS844002I-01 uses ICS’ 3^rdgeneration

low phase noise VCO technology and can achieve <1ps

typical rms phase jitter, easily meeting Ethernet jitter

requirements. The ICS844002I-01 is packaged in a small

20-pin TSSOP package.

• VCO range: 560MHz - 680MHz

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

(1.875MHz - 20MHz): 0.41ps (typical)

• Full 2.5V supply mode

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

• Available in both, standard and RoHS/Lead-Free compliant

packages

PIN ASSIGNMENT

FREQUENCY SELECT FUNCTION TABLE

V^DDO

Output Frequency (MHz)

M Divider N Divider

nQ1

(25MHz Reference)

F_SEL1 F_SEL0

Value

GND

V^DD

nQ0

156.25

125

nXTAL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

F_SEL1

nPLL_SEL

V^DDA

F_SEL0

V^DD

62.5

Not Used

ICS844002I-01

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

package body

G Package

Top View

BLOCK DIAGRAM

Pulldown

F_SEL[1:0]

Pulldown

nPLL_SEL

F_SEL[1:0]

0 0 ÷4

nQ0

Pulldown

REF_CLK

0 1 ÷5

25MHz

XTAL_IN

1 0 ÷10

1 1 not used

VCO

Phase

Detector

625MHz

OSC

(w/25MHz

Reference)

nQ1

XTAL_OUT

Pulldown

nXTAL_SEL

M = 25 (fixed)

Pulldown

844002AGI-01

www.icst.com/products/hiperclocks.html

REV.A JANUARY 5, 2006

12 3 4 5 6 7...12

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