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[原创] Silabs Si549Ultra Series第四代振荡器解决方案

关键词:振荡器 通信设备 网络通信 广播设备 测试测量 以太网

时间:2018-03-14 10:52:43       作者:Silabs       来源:中电网

Silabs公司的Si549是Ultra Series振荡器是采用第四代DSPLL技术,在任何输出频率都具有超低抖动和低相位噪音,通过I2C指令用户可进行编程,频率从0.2MHz到1500MHz,分辨率优于1ppb,3.3V,2.5V和1.8V VDD电源,输出格式包括LVPECL,LVDS,CML,HCSL,CMOS和双路CMOS,主要用在100G/200G/400G OTN,相干光学,PAM4,10G/40G/100G光以太网,3G-SDI/12G-SDI/24G-SDI广播视频,服务器,交换,存储和搜索加速器,测试测量以及FPGA/ASIC时钟.本文介绍了Si549主要特性,框图,通用评估板Si5xxUC-EVB主要特性,框图和电路图.

The Si549 Ultra Series™ oscillator utilizes Silicon Laboratories’advanced 4thgeneration DSPLL® technology to provide an ultra-low jitter, low phase noiseclock at any output frequency. The device is user-programmed via simpleI2C commands to provide any frequency from 0.2 to 1500 MHz with <1 ppbresolution and maintains exceptionally low jitter for both integer and fractionalfrequencies across its operating range. The Si549 offers excellent reliabilityand frequency stability as well as guaranteed aging performance. On-chippower supply filtering provides industry-leading power supply noise rejection,simplifying the task of generating low jitter clocks in noisy systems that useswitched-mode power supplies.
 
The Si549 has a dramatically simplified supplychain that enables Silicon Labs to ship custom frequency samples 1-2weeks after receipt of order. Unlike a traditional XO, where a different crystalis required for each output frequency, the Si549 uses one simple crystal anda DSPLL IC-based approach to provide the desired output frequency. TheSi549 is factory-configurable for a wide variety of user specifications, includingstartup frequency, I2C address, output format, and OE pin location/polarity. Specific configurations are factory-programmed at time of shipment,eliminating the long lead times associated with custom oscillators.

Si549主要特性:

• I2C programmable to any frequency from 0.2 to1500 MHz with < 1 ppb resolution
• Ultra low jitter: 95 fs Typ RMS (12 kHz – 20 MHz)
• Configure up to 4 pin-selectable startup frequencies
• I2C interface supports 100 kbps, 400 kbps, and 1Mbps (Fast Mode Plus)
• Excellent PSRR and supply noise immunity: –80dBcTyp
• 3.3 V, 2.5 V and 1.8 V VDD supply operation fromthe same part number
• LVPECL, LVDS, CML, HCSL, CMOS, and DualCMOS output options
• 3.2x5, 5x7 mm package footprints
• Samples available with 1-2 week lead times

Si549应用:

• 100G/200G/400G OTN, coherent optics, PAM4
• 10G/40G/100G optical ethernet
• 3G-SDI/12G-SDI/24G-SDI broadcast video
• Servers, switches, storage, search acceleration
• Test and measurement
• FPGA/ASIC clocking

图1.Si549框图

通用评估板Si5xxUC-EVB

Universal Oscillator Evaluation Board
This document describes operation of the Silicon Laboratories Si5xxUC-EVB evaluation board designed to evaluate any of Silicon Labs’ pin-controlled or I2C configurable Si5xx XOs or VCXOs. Three device sites are available to support one of either 5mm x 7mm,3.2mm x 5mm, or 2.5mm x 3.2mm devices in either 4, 6, or 8 pin configurations. Selector switches make it easy to configure device control pins (pins 1, 2, 7, or 8) for proper operation without the use of jumpers. Similarly, XO device VDD voltage (3.3V,2.5V,1.8V) can be selected via switches based on either external +5V (for stand-alone operation)or micro USB sourced +5V USB operation. The EVB also features flexible outputtermination circuits and PCB layout optimized for superior signal integrity.

The Si5xxUC-EVB is an evaluation board designed to support any Silicon Labs XO/VCXO device. The Si5xxUC-EVB is designed tooperate in one of two general operational modes:• Stand-alone mode: The stand-alone mode is for evaluation of fixed output frequency or pin-controlled XO/VCXO deviceswhere I2C support is NOT required to operate or evaluate the device. Control of device pins, such as OE or FS, is done via on-board switches. In Stand-alone mode the on-board switches must be set according to the requirements of the device installed on theboard. For example, if the installed device is a dual frequency part with output enable, the appropriate switches must be set to assert output enable (OE) and the frequency select pin (FS) to give the desired output frequency. Device VDD voltage can be set via onboardswitches as well.

Software controlled mode: The software controlled mode is for use with PC-based software tools (such as our Programmable OscillatorCalculator Tool) to control/configure the device being evaluated via the device I2C bus. The software controlled mode is primarilyintended for I2C controlled XO/VCXO devices. When using software controlled mode, some of the on-board switches mustbe placed in specific default settings to allow the on-board MCU to perform I2C control. Other switches must still be used on certain device signals, like output enable (OE).

通用评估板Si5xxUC-EVB主要特性:

• Evaluation of any Silicon Labs XO orVCXO (Si51x, Si53x, Si54x, Si55x, Si57x,Si59x)
• AC coupled differential/single-ended outputclocks.
• Voltage control (Vc) port for VCXOevalution.
• Switch selectable settings. No jumpers.
• External power or USB powered.
• Use stand-alone or with our ProgrammableOscillator Calculator SW tool

图2.通用评估板Si5xxUC-EVB外形图

图3.通用评估板Si5xxUC-EVB框图

图4.通用评估板Si5xxUC-EVB电路图(1)

图5.通用评估板Si5xxUC-EVB电路图(2)
详情请见:
https://www.silabs.com/documents/public/data-sheets/si549-datasheet.pdf
https://www.silabs.com/documents/public/user-guides/ug298-si5xxuc-evb-ug.pdf
si549-datasheet.pdf
ug298-si5xxuc-evb-ug.pdf

 

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