Datasheet > XR81111

XR81111

更新时间： 2024-11-12 01:13:11

品牌	Logo	应用领域
艾科嘉 - EXAR		/
页数	文件大小	规格书
12页	232K
描述
Universal Clock - High Frequency LVPECL Clock Synthesizer

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XR81111 数据手册

XR81111

Universal Clock - High Frequency

LVPECL Clock Synthesizer

General Description

FEATURES

• XR81111-CA04: Factory Configured

The XR81111-CA04 is a clock synthesizer with Integer divider, LVPECL

driver, 3.3V/2.5V supply, taking a 25MHz Xtal input and providing one of four

selectable output frequencies. The device is optimized for use with a 25MHz

crystal (or system clock) and generates a selection of output frequencies -

156.25MHz for 10GE/XAUI, 150MHz for SAS, 125MHz for GE and 100MHz

for PCIe applications.

• Footprint compatible with 5mm x 7mm differen-

tial oscillators

• One differential LVPECL output pair

• Crystal oscillator interface which can also be

overdriven using a single-ended reference clock

• Output frequency range: 100MHz - 156.25MHz

The application diagram below shows a typical synthesizer configuration

with any standard crystal oscillating in fundamental mode. Internal load

capacitors are optionally available to minimize/eliminate external crystal

loads. A system clock can also be used to overdrive the oscillator for a syn-

chronous timing system.

• Crystal/input frequency: 25MHz, parallel resonant

crystal

• VCO range: 2GHz - 3GHz

• RMS phase jitter @ 156.25MHz, 12kHz - 20MHz:

<0.60ps

• Full 3.3V or 2.5V operating supply

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

• Lead-free (RoHS 6) package

The typical phase noise plot below shows the jitter integrated over the

12KHz to 20MHz range that is widely used in WAN systems. Most LAN

applications however use the integration range of 1.875MHz to 20MHz.

These clock devices show a very good high frequency noise floor below -

150dB.

APPLICATIONS

• 10GE, GE LAN/WAN

The XR81111 is a family of Universal Clock synthesizer devices in QFN-10

packages that are footprint compatible with industry standard 5mm x 7mm

oscillators. The devices generate ANY frequency in the range of 100 MHz to

1.5GHz by utilizing a highly flexible delta sigma modulator and a wide rang-

ing VCO. The high clock frequency LVPECL outputs have very low phase

noise jitter of sub 0.6ps, while consuming extremely low power. These

devices can be used with standard crystals or external system clock and can

be configured to select from four different frequency multiplier settings to

support a wide variety of applications. This family of products have an

extremely low power PLL block with core power consumption less than 40%

of the equivalent devices from competition. By second sourcing several of

the existing sockets, these devices provides a very compelling power effi-

ciency value benefit across all market segments.

• 2.5G/10G SONET/SDH/OTN

• xDSL, PCIe

• Low-jitter Clock Generation

• Synchronized clock systems

Ordering Information – page 12

Other clock multiplier and/or driver configurations are possible in this clock

family and can be requested from the factory

Typical Application

XR81111ꢀPHASEꢀNOISEꢀ(dBc/Hz)

XR81111ͲCA04

-40db

V_CC

2.5Vꢀorꢀ3.3V

RMS Jitter = 532.3fs

-60db

-80db

XTAL_IN

100MHzꢀtoꢀ156.25MHz

Int Range 12KHz to 20MHz

25MHz

XTAL_OUT

-100db

-120db

-140db

-160db

-180db

Enable

FSEL1

FreqꢀSelect

FSEL0

V_EE

100Hz

1KHz

10KHz

100KHz

1MHz

10MHz

1 / 12

exar.com/XR81111

Rev 1B

12 3 4 5 6 7...12

中文翻译

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与XR81111相关器件

型号	品牌	获取价格	描述	数据表
XR81111-CA04-F	EXAR	获取价格	Universal Clock - High Frequency LVPECL Clock Synthesizer
XR81111-CA04TR-F	EXAR	获取价格	Clock Generator, 156.25MHz, CMOS, QFN-10
XR81111EVB	EXAR	获取价格	Universal Clock - High Frequency LVPECL Clock Synthesizer
XR81112	EXAR	获取价格	Universal Clock - High Frequency LVCMOS/LVDS/LVPECL Clock Synthesizer
XR81112EVB	EXAR	获取价格	Universal Clock - High Frequency LVCMOS/LVDS/LVPECL Clock Synthesizer
XR81112-F	EXAR	获取价格	Universal Clock - High Frequency LVCMOS/LVDS/LVPECL Clock Synthesizer
XR-8115BIQ	ETC	获取价格	Battery Management
XR81411	EXAR	获取价格	Universal Quad Clock - High Frequency LVCMOS/LVDS/LVPECL Clock Synthesizer
XR81411EVB	EXAR	获取价格	Universal Quad Clock - High Frequency LVCMOS/LVDS/LVPECL Clock Synthesizer
XR81411-F	EXAR	获取价格	Universal Quad Clock - High Frequency LVCMOS/LVDS/LVPECL Clock Synthesizer

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