Ultra Series Crystal Oscillator Si540 Data Sheet Ultra Low Jitter Any-Frequency XO (125 fs), 0.2 to 1500 MHz KEY FEATURES th The Si540 Ultra Series oscillator utilizes Skyworks Solutions advanced 4 Available with any frequency from 0.2 MHz to generation DSPLL technology to provide an ultra-low jitter, low phase noise 1500 MHz clock at any output frequency. The device is factory-programmed to any frequency Very low jitter: 125 fs Typ RMS from 0.2 to 1500 MHz with <1 ppb resolution and maintains exceptionally low (12 kHz 20 MHz) jitter for both integer and fractional frequencies across its operating range. The Excellent PSNR and supply noise immunity: Si540 offers excellent reliability and frequency stability as well as guaranteed 80 dBc Typ aging performance. On-chip power supply filtering provides industry-leading power 7 ppm stability option (-40 to 85C) supply noise rejection, simplifying the task of generating low jitter clocks in noisy systems that use switched-mode power supplies. Offered in industry-standard 3.3 V, 2.5 V and 1.8 V V supply operation DD footprints, the Si540 has a dramatically simplified supply chain that enables Sky- from the same part number works to ship custom frequency samples 1-2 weeks after receipt of order. Unlike LVPECL, LVDS, CML, HCSL, CMOS, and a traditional XO, where a different crystal is required for each output frequency, Dual CMOS output options the Si540 uses one simple crystal and a DSPLL IC-based approach to provide 2.53.2, 3.25, 5x7 mm package options the desired output frequency. This process also guarantees 100% electrical testing Any custom frequency available with 1-2 of every device. The Si540 is factory-configurable for a wide variety of user specifi- week lead times cations, including frequency, 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. APPLICATIONS 100G/200G/400G OTN, coherent optics Pin Assignments 10G/40G/100G optical ethernet 3G-SDI/12G-SDI/24G-SDI broadcast video OE/NC 1 6 VDD Servers, switches, storage, NICs, search acceleration Test and measurement NC/OE 2 5 CLK- Clock and data recovery FPGA/ASIC clocking 3 4 CLK+ GND (Top View) Fixed Frequency Pin Descriptions Frequency Flexible Low Crystal DSPLL Noise 1, 2 Selectable via ordering option Driver DCO OE = Output enable NC = No connect Digital Digital OSC Phase Error Phase Loop Cancellation Detector Filter 3 GND = Ground Flexible Phase Error Formats, 1.8V 3.3V 4 CLK+ = Clock output Fractional Operation Divider NVM 5 CLK- = Complementary clock output. Not used Control Power Supply Regulation for CMOS. 6 VDD = Power supply Output Enable Built-in Power Supply (Pin Control) Noise Rejection Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 1.3 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice December 2, 2021 1Si540 Data Sheet Ordering Guide 1. Ordering Guide The Si540 XO supports a variety of options including frequency, output format, and OE pin location/polarity, as shown in the chart below. Specific device configurations are programmed into the part at time of shipment, and samples are available in 1-2 weeks. Skyworks Solutions provides an online part number configuration utility to simplify this process. Refer to