Datasheet > 840N022BGILFT

840N022BGILFT

更新时间： 2024-11-03 01:10:47

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
13页	181K
描述
FemtoClockÂ® NG Crystal-to-LVCMOS/LVTTL Clock

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数据手册

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840N022BGILFT 数据手册

FemtoClock® NG

Crystal-to-LVCMOS/LVTTL Clock

840N022

DATA SHEET

General Description

Features

The 840N022 is a LVCMOS/LVTTL clock synthesizer designed for

Ethernet applications. The device generates a selectable 125MHz or

62.5MHz clock signal with excellent phase jitter performance. The

device uses IDT’s fourth generation FemtoClock® NG technology

for an optimum of high clock frequency, low phase noise

performance and low power consumption.The device supports 2.5V

or 3.3V voltage supply and is packaged in a small, lead-free (RoHS

6) 8-lead TSSOP package. The extended temperature range

supports wireless infrastructure, telecommunication, and networking

end equipment requirements.

• Fourth generation FemtoClock® NG technology

• 125MHz output clock synthesized from a 25MHz fundamental

mode crystal

• One LVCMOS/LVTTL clock output

• Crystal interface designed for a 12pF parallel resonant crystal

• RMS phase jitter @ 125MHz, using a 25MHz crystal

(1.875MHz - 20MHz): 0.148ps (maximum)

• RMS phase jitter @ 125MHz, using a 25MHz crystal

(12kHz - 20MHz): 0.479ps (maximum)

• LVCMOS interface levels for the control inputs

• Full 2.5V or 3.3V supply voltage

FREQ_SEL Frequency Table

Input

FREQ_SEL

0 (default)

Output Frequency

• Lead-free (RoHS 6) packaging

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

• Use replacement part: 840N202CKI-dddLF

f_XTAL= 25MHz

f_XTAL= 20MHz

100MHz

125MHz

62.5MHz

50MHz

NOTE: FREQ_SEL is an asynchronous control.

OE Function Table

Input

Output Enable

Output Q is disabled in high-impedance state

Output Q is enabled.

1 (default)

NOTE: OE is an asynchronous control.

Pin Assignment

Block Diagram

VDDA

XTAL_OUT

XTAL_IN

VDD

GND

FREQ_SEL

FemtoClock^®NG

VCO

490-637.5MHz

XTAL_IN

PFD

÷5,

÷10

OSC

LPF

XTAL_OUT

840N022

8-lead TSSOP

÷25

4.40mm x 3.0mm x 0.925mm

package body

Pulldown

Pullup

FREQ_SEL

G Package

Top View

840N022 REVISION A 8/14/15

12 3 4 5 6 7...13

中文翻译

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