Datasheet > 843002

843002

更新时间： 2024-11-02 01:11:55

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
17页	379K
描述
Femtoclock Crystal-to-3.3V LVPECL Frequency Synthesizer

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数据手册

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843002 数据手册

Femtoclock^®Crystal-to-3.3V LVPECL

Frequency Synthesizer

843002

Data Sheet

FEATURES

GENERAL DESCRIPTION

• Two 3.3V LVPECL outputs

The 843002 is a two output LVPECL synthesizer optimized to

generate Fibre Channel reference clock frequencies . 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 843002 uses IDT’s 3^rdgeneration low phase

noise VCO technology and can achieve 1ps or lower typical rms

phase jitter, easily meeting Fibre Channel jitter requirements. The

843002 is packaged in a small 20-pin TSSOP package.

• 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 (637kHz - 10MHz): 0.72ps (typical)

• Typical phase noise at 212.5MHz

Phase noise:

Offset

Noise Power

100Hz ................-87.7 dBc/Hz

1KHz ..............-111.6 dBc/Hz

10KHz ..............-124.3 dBc/Hz

100KHz ..............-124.3 dBc/Hz

• Full 3.3V supply mode

• Lead-Free package RoHS compliant

• -30°C to 85°C ambient operating temperature

FREQUENCY SELECT FUNCTION TABLE

PIN ASSIGNMENT

Inputs

Output

Frequency

Input Fre-

M Divider N Divider

M/N

Divider Value

quency

(MHz)

F_SEL1 F_SEL0

(MHz)

Value

26.5625

23.4375

212.5

159.375

106.25

53.125

187.5

843002

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

BLOCK DIAGRAM

package body

G Package

Top View

Pulldown

F_SEL[1:0]

Pulldown

nPLL_SEL

F_SEL[1:0]

nQ0

0 0 ÷3

0 1 ÷4

1 0 ÷6

1 1 ÷12

Pulldown

TEST_CLK

26.5625MHz

XTAL_IN

OSC

VCO

637.5MHz

(w/26.5625MHz

Reference)

Phase

Detector

nQ1

XTAL_OUT

Pulldown

nXTAL_SEL

M = 24 (fixed)

Pulldown

Revision B January 21, 2016

12 3 4 5 6 7...17

中文翻译

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