ICS843002I-41

700MHZ, FEMTOCLOCKS™ VCXO BASED SONET/SDH JITTER ATTENUATOR

IDT™ / ICS™ VCXO BASED SONET/SDH JITTER ATTENUATOR

2

ICS843002AKI-41 REV. A OCTOBER 25, 2007

Block Diagram

R Divider =

1, 2, 4, 8,

16 or 32

CLK1

nCLK1

Activity

Detector

CLK0

nCLK0

Activity

Detector

LOR1

LOR0

R_SEL2:0

3

ISET

CLK_SEL

FemtoClock

PLL

x32

622.08 MHz

V

CCO_PECL

QA

nQA

Cx Divider =

1,2,4,8,16,32,

HiZ or Disable

QB

nQB

QB_SEL2:0

QA_SEL2:0

3

3

VCXO

Charge

Pump

and Loop

Filter

External

Loop

Components

19.44 MHz

Pullable

xtal

19.44 MHz

LF1

LF0

Divide

by 32

Divide

by 32

VCXO Jitter Attenuation PLL

Phase

Detector

ICS843002I-41

110

110

111

111

V

CCO_LVCMOS

1

0

Cx Divider =

1,2,4,8,16,32,

HiZ or Disable

NOTE: 19.44MHz VCXO crystal shown is typical for SONET/SDH device applications.