ICS44002AI01 datasheet(1/14 Pages) IDT

部件名	ICS44002AI01

功能描述	FEMTOCLOCKS CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER

PDF	14 Pages

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制造商	IDT [Integrated Device Technology]

网页	http://www.idt.com

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1 / 14 page

FEMTOCLOCKS– CRYSTAL-TO-

LVDS FREQUENCY SYNTHESIZER

ICS844002I-01

IDT™ / ICS™ LVDS FREQUENCY SYNTHESIZER

1

ICS844002AGI-01 REV. C SEPTEMBER 28, 2007

General Description

The ICS844002I-01 is a 2 output LVDS Synthesizer

optimized to generate Ethernet reference clock

frequencies and is a member of the HiPerClocksTM

family of high performance clock solutions from IDT.

Using a 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 IDT’s 3rd generation 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.

Block Diagram

Features

• Two differential LVDS outputs

• Selectable crystal oscillator interface or

single-ended LVCMOS/LVTTL input

• Supports the following output frequencies: 156.25MHz,

125MHz, 62.5MHz

• 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 (RoHS 5) and lead-free (RoHS 6)

packages

HiPerClockS™

ICS

1

0

1

0

Phase

Detector

VCO

625MHz

(w/25MHz

Reference)

M = 25 (fixed)

F_SEL[1:0]

0 0

÷4

0 1

÷5

1 0

÷10

1 1

not used

2

OSC

F_SEL[1:0]

PLL_SEL

XTAL_SEL

MR

REF_CLK

XTAL_IN

XTAL_OUT

Q0

Q1

Pulldown

25MHz

ICS844002I-01

20-Lead TSSOP

6.5mm x 4.4mm x 0.925mm

package body

G Package

Top View

Pin Assignment

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

F_SEL0

VDDA

nc

PLL_SEL

MR

Q0

VDDO

nc

VDD

VDDO

Q1

GND

nc

XTAL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

F_SEL1

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