Datasheet > 844008I-46

844008I-46

更新时间： 2022-02-26 12:27:41

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
16页	295K
描述
FemtoClock Crystal-to-LVDS Clock Generator

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数据手册

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844008I-46 数据手册

FemtoClock^®Crystal-to-LVDS

Clock Generator

844008I-46

DATA SHEET

GENERAL DESCRIPTION

FEATURES

• Eight differential LVDS outputs

The 844008I-46 is a 10Gb Ethernet Clock Generator and a member

of the HiPerClocks™ family of high performance devices from

IDT. The 844008I-46 can synthesize 156.25MHz or 100MHz with

a 25MHz crystal. It has a total of 8 LVDS outputs. The 844008I-46

has excellent phase jitter performance and is packaged in a 32

Lead VFQFN package, making it ideal for use in systems with

limited board space.

• Crystal oscillator interface designed for 18pF parallel resonant

crystals

• Supports the following output frequencies:

156.25MHz or 100MHz

• VCO frequency: 625MHz or 600MHz

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

(1.875MHz - 20MHz): 0.45ps (typical)

• Full 2.5V supply mode

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

• Available in lead-free (RoHS 6) packages

• For functional replacement part use 8T49N285

FREQUENCY SELECT FUNCTION TABLE

Input

XTAL Frequency

(MHz)

FREQ_SEL

FB Divider

÷25

Output Divider

VCO (MHz)

625

Output Frequency (MHz)

156.25 (default)

100

÷4

÷6

÷24

600

PIN ASSIGNMENT

BLOCK DIAGRAM

Pullup

25MHz

Q0:Q7

XTAL_IN

OSC

Phase

Detector

VCO

625MHz or

600MHz

÷4

nQ0:nQ7

÷6

32 31 30 29 28 27 26 25

XTAL_OUT

nQ0

GND

FB = ÷25 or ÷24

GND

nQ7

ICS844008I-46

32-Lead VFQFN

5mm x 5mm x 0.925mm pack-

nQ1

V^DDO

Pulldown

age body

K Package

Top View

FREQ_SEL

V^DDO

nQ6

nQ2

10 11 12 13 14 15 16

844008I-46 REVISION A 11/6/15

12 3 4 5 6 7...16

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