Datasheet > 8T49N243NLGI8

8T49N243NLGI8

更新时间： 2024-09-26 01:12:11

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
59页	1323K
描述
FemtoClock NG Universal Frequency Translator

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8T49N243NLGI8 数据手册

FemtoClock NG

8T49N243

Datasheet

Universal Frequency Translator

Description

Features

▪ Supports SDH/SONET and Synchronous Ethernet clocks

The 8T49N243 has one fractional-feedback PLL that can be used as

a jitter attenuator and frequency translator. It is equipped with one

integer and one fractional output divider, allowing the generation of

up to two different output frequencies, ranging from 8kHz to 1GHz.

These frequencies are completely independent of each other, the

input reference frequencies and the crystal reference frequency. The

device places virtually no constraints on input to output frequency

conversion, supporting all FEC rates, including the new revision of

ITU-T Recommendation G.709 (2009), most with 0ppm conversion

error. The outputs may select among LVPECL, LVDS, HCSL or

LVCMOS output levels.

including all FEC rate conversions

▪ 375fs RMS typical jitter (including spurs): 12kHz to 20MHz

▪ Operating Modes: synthesizer, jitter attenuator

▪ Operates from a 10MHz to 50MHz fundamental-mode crystal or a

10MHz to 125MHz external oscillator

▪ Accepts one LVPECL, LVDS, LVHSTL or LVCMOS input clock

— Accepts frequencies ranging from 8kHz to 875MHz

— Clock input monitoring

▪ Generates two LVPECL / LVDS / HCSL or four LVCMOS device

outputs

This makes it ideal to be used in any frequency synthesis

application, including 1G, 10G, 40G and 100G Synchronous

Ethernet, OTN, and SONET/SDH, including ITU-T G.709 (2009) FEC

rates.

— Output frequencies ranging from 8kHz up to 1.0GHz

(differential)

— Output frequencies ranging from 8kHz to 250MHz (LVCMOS)

— One integer divider ranging from ÷4 to ÷786,420

— Three fractional output dividers (see Output Dividers)

▪ Programmable loop bandwidth settings from 0.2Hz to 6.4kHz

— Optional fast-lock function

The 8T49N243 accepts one differential or single-ended input clock

and a fundamental-mode crystal input. The internal PLL can lock to

the input reference clock or just to the crystal to behave as a

frequency synthesizer. A second input reference (FBIN) is used as

the external feedback input for zero delay buffer functionality.

▪ Four general purpose I/O pins with optional support for status &

The device monitors both input references for Loss of Signal (LOS),

and generates an alarm when an input reference failure is detected.

control:

— Two output enable control inputs provide control over the

device outputs

The PLL has a register-selectable loop bandwidth from 0.2Hz to

6.4kHz. The device starts up with output Q0 set to 10MHz, and

output Q1 set to 20MHz. Loop bandwidth is set to 25Hz. Input clock,

CLK is set to 2.5MHz.

— Lock and Loss-of-Signal alarm outputs

▪ Open-drain Interrupt pin

▪ Register programmable through I²C

The device supports output enable inputs and Lock and LOS status

outputs.

The device is programmable through an I²C interface.

▪ Full 2.5V or 3.3V supply modes, 1.8V support for LVCMOS

outputs, GPIO and control pins

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

▪ Package: 40QFN, lead-free (RoHS 6)

Typical Applications

▪ OTN or SONET / SDH equipment

▪ Gigabit and Terabit IP switches / routers including Synchronous

Ethernet

▪ Video broadcast

November 8, 2016

12 3 4 5 6 7...59

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与8T49N243NLGI8相关器件

型号	品牌	获取价格	描述	数据表
8T49N281	IDT	获取价格	FemtoClock NG Octal Universal Frequency Translator
8T49N281	RENESAS	获取价格	FemtoClock NG Universal Frequency Translator (2-in/1-PLL/8-out)
8T49N281_16	IDT	获取价格	FemtoClock NG Octal Universal Frequency Translator
8T49N281C-DDDNLGI	IDT	获取价格	FemtoClock NG Octal Universal Frequency Translator
8T49N281C-DDDNLGI8	IDT	获取价格	FemtoClock NG Octal Universal Frequency Translator
8T49N282	IDT	获取价格	FemtoClock NG Octal Universal Frequency Translator
8T49N282	RENESAS	获取价格	FemtoClock NG Dual Universal Frequency Translator (4-in/2-PLL/8-out)
8T49N282_16	IDT	获取价格	FemtoClock NG Octal Universal Frequency Translator
8T49N282C-DDDNLGI	IDT	获取价格	FemtoClock NG Octal Universal Frequency Translator
8T49N282C-DDDNLGI8	IDT	获取价格	FemtoClock NG Octal Universal Frequency Translator

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