Datasheet > 843252

843252

更新时间： 2024-01-24 00:30:27

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
17页	382K
描述
FemtoClock Crystal-to- 3.3V LVPECL Frequency Synthesizer

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843252 数据手册

FemtoClock^®Crystal-to- 3.3V LVPECL

Frequency Synthesizer

843252

Datasheet

General Description

Features

The 843252 is a 2 differential output LVPECL Synthesizer designed

to generate Ethernet reference clock frequencies. Using a 25MHz,

18pF parallel resonant crystal, the following frequencies can be

generated based on the settings of 4 frequency select pins

(SELA[1:0], SELB[1:0]): 625MHz, 312.5MHz, 156.25MHz, and

125MHz.

• Two differential LVPECL output pairs

• Using a 25MHz crystal, the two output banks can be

independently set for 625MHz, 312.5MHz, 156.25MHz or 125MHz

• Crystal oscillator interface

• VCO frequency: 490MHz – 680MHz

• RMS Phase Jitter @ 156.25MHz, (1.875MHz – 20MHz) using a

The two banks have their own dedicated frequency select pins and

can be independently set for the frequencies mentioned above. The

843252 IDT’s 3^rdgeneration low phase noise VCO technology and

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

Ethernet jitter requirements. The 843252 is packaged in a small

16-pin TSSOP package.

25MHz crystal: 0.47ps (typical)

• Full 3.3V supply mode

• 0°C to 70°C ambient operating temperature

• Industrial temperature available upon request

• Available in lead-free (RoHS 6) package

Pin Assignment

Block Diagram

Pullup

nQB

16 XTAL_IN

SELA[0:1]

XTAL_OUT

V^EE

0 0 ÷1

0 1 ÷2

1 0 ÷3

1 1 ÷4 (default)

V^CCO_B

SELB1

SELB0

V^CCO_A

SELA1

SELA0

V^CC

nQA

XTAL_IN

XTAL_OUT

Phase

Detector

VCO

OSC

490MHz - 680MHz

0 0 ÷2

0 1 ÷4

1 0 ÷5

VCCA

nQA

FB_SEL

nQB

1 1 ÷8 (default)

Feedback Divider

0 = ÷25 (default)

1 = ÷32

843252

16-Lead TSSOP

4.4mm x 5.0mm x 0.925mm package body

G Package

Pulldown

Pullup

FB_SEL

SELB[0:1]

Revision B, January 20, 2016

12 3 4 5 6 7...17

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与843252相关器件

型号	品牌	获取价格	描述	数据表
843252AGI-04LF	IDT	获取价格	Clock Generator, 187.5MHz, PDSO16, 4.40 X 5 MM, 0.92 MM HEIGHT, ROHS COMPLIANT, MO-153, TS
843252AGI-04T	IDT	获取价格	Clock Generator, 187.5MHz, PDSO16, 4.40 X 5 MM, 0.92 MM HEIGHT, MO-153, TSSOP-16
843252AGLF	IDT	获取价格	FemtoClock Crystal-to- 3.3V LVPECL Frequency Synthesizer
843252AGLFT	IDT	获取价格	FemtoClock Crystal-to- 3.3V LVPECL Frequency Synthesizer
843253AGI-45LF	IDT	获取价格	Clock Generator, 156.25MHz, PDSO16, 4.40 X 5 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-153,
843253AGI-45LFT	IDT	获取价格	Clock Generator, 156.25MHz, PDSO16, 4.40 X 5 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-153,
843256AGI-45LF	IDT	获取价格	Clock Generator, 156.25MHz, PDSO24, 5 X 4.40 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, TSSOP-24
843256AGI-45LFT	IDT	获取价格	Clock Generator, 156.25MHz, PDSO24, 5 X 4.40 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, TSSOP-24
843256AGILF	IDT	获取价格	Clock Generator
843256AGILFT	IDT	获取价格	Clock Generator