ICS844002 datasheet(1/16 Pages) IDT

Part #	ICS844002

Description	FEMTOCLOCKS??CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

PDF	16 Pages

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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FEMTOCLOCKS™ CRYSTAL-TO-LVDS

FREQUENCY SYNTHESIZER

ICS844002

IDT™ / ICS™ LVDS FREQUENCY SYNTHESIZER

1

ICS844002AG REV. A SEPTEMBER 28, 2007

GENERAL DESCRIPTION

The ICS844002 is a 2 output LVDS Synthesizer

optimized to generate Fibre Channel reference

clock frequencies and is a member of the

HiPerClocksTM family of high performance clock

solutions from IDT. Using a 26.5625MHz 18pF

parallel resonant crystal, the following frequencies can be

generated based on the 2 frequency select pins (F_SEL[1:0]):

212.5MHz, 187.5MHz, 159.375MHz, 106.25MHz and

53.125MHz. The ICS844002 uses IDT’s 3rd generation low

phase noise VCO technology and can achieve <1ps typical rms

phase jitter, easily meeting Fibre Channel jitter requirements.

The ICS844002 is packaged in a small 20-pin TSSOP package.

FEATURES

• Two LVDS outputs

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• Supports the following output frequencies: 212.5MHz,

187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz

• VCO range: 560MHz - 680MHz

• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal

(637kHz - 10MHz): 0.65ps (typical)

• Full 3.3V or 2.5V supply modes

• 0°C to 70°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

637.5MHz

(w/26.5625MHz

Reference)

M = 24 (fixed)

F_SEL[1:0]

0 0

÷3

0 1

÷4

1 0

÷6

1 1

÷12

2

OSC

BLOCK DIAGRAM

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FREQUENCY SELECT FUNCTION TABLE

F_SEL[1:0]

nPLL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

nXTAL_SEL

MR

Q0

nQ0

Q1

nQ1

Pulldown

26.5625MHz

Pulldown

ICS844002

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

package body

G Package

Top View

nc

VDDO

Q0

nQ0

MR

nPLL_SEL

nc

VDDA

F_SEL0

VDD

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

VDDO

Q1

nQ1

GND

nc

nXTAL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

F_SEL1

PIN ASSIGNMENT

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