Datasheet > 843002I-01

843002I-01

更新时间： 2022-02-26 12:01:20

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
17页	304K
描述
LVPECL Frequency Synthesizer

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843002I-01 数据手册

FemtoClocks® Crystal-to-

3.3V, 2.5V LVPECL Frequency Synthesizer

843002I-01

DATASHEET

GENERAL DESCRIPTION

FEATURES

• Two 3.3V or 2.5V LVPECL outputs

The 843002I-01 is a 2 output LVPECL synthesizer optimized to

generate Ethernet reference clock frequencies.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 843002I-01 uses

IDT’s FemtoClock^®low phase noise VCO technology and can

achieve 1ps or lower typical rms phase jitter, easily meeting

Ethernetjitter requirements. The 843002I-01 is packaged in a

small 20-pin TSSOP package.

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• Supports the following output frequencies:

156.25MHz, 125MHz and 62.5MHz

• VCO range: 560MHz - 680MHz

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

(1.875MHz-20MHz): 0.55ps (typical)

• Output skew: 30ps (maximum)

• Supply Voltage Modes

Core/Outputs

3.3/3.3

2.5/2.5

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

• Available in lead-free RoHS-compliant package

FREQUENCY SELECT FUNCTION TABLE

PIN ASSIGNMENT

Inputs

V^CCO

VCCO

Output Frequency

nQ1

V^EE

VCC

nXTAL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

F_SEL1

M Divider N Divider

Value

(25MHz Ref.)

F_SEL1 F_SEL0

nQ0

nPLL_SEL

V^CCA

F_SEL0

V^CC

Value

156.25 (default)

125

62.5

125

843002I-01

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

package body

BLOCK DIAGRAM

Pulldown

F_SEL[1:0]

G Package

Top View

Pulldown

nPLL_SEL

F_SEL[1:0]

nQ0

0 0 ÷4 (default)

0 1 ÷5

1 0 ÷10

Pulldown

REF_CLK

1 1 ÷5

nQ1

25MHz

XTAL_IN

OSC

VCO

625MHz

(w/25MHz

Reference)

Phase

Detector

XTAL_OUT

Pulldown

nXTAL_SEL

M = 25 (fixed)

Pulldown

843002I-01 REVISION A 2/20/15

12 3 4 5 6 7...17

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