Ultra Series Crystal Oscillator Si549 Data Sheet Ultra Low Jitter I2C Programmable XO (95 fs), 0.2 to 1500 MHz The Si549 Ultra Series oscillator utilizes Skyworks Solutions advanced th KEY FEATURES 4 generation DSPLL technology to provide an ultra-low jitter, low phase noise clock at any output frequency. The device is user-programmed via I2C programmable to any frequency from 0.2 to simple I2C commands to provide any frequency from 0.2 to 1500 MHz with 1500 MHz with < 1 ppb resolution <1 ppb resolution and maintains exceptionally low jitter for both integer and Ultra low jitter: 95 fs Typ RMS (12 kHz 20 MHz) fractional frequencies across its operating range. The Si549 offers excellent reliability and frequency stability as well as guaranteed aging performance. Configure up to 4 pin-selectable startup frequencies On-chip power supply filtering provides industry-leading power supply noise I2C interface supports 100 kbps, 400 kbps, and 1 rejection, simplifying the task of generating low jitter clocks in noisy systems Mbps (Fast Mode Plus) that use switched-mode power supplies. The Si549 has a dramatically Excellent PSNR and supply noise immunity: 80 simplified supply chain that enables Skyworks to ship custom frequency dBc Typ samples 1-2 weeks after receipt of order. Unlike a traditional XO, where 3.3 V, 2.5 V, and 1.8 V V supply operation from DD a different crystal is required for each output frequency, the Si549 uses the same part number one simple crystal and a DSPLL IC-based approach to provide the desired LVPECL, LVDS, CML, HCSL, CMOS, and Dual output frequency. The Si549 is factory-configurable for a wide variety of user CMOS output options specifications, including startup frequency, I2C address, output format, and 2.5x3.2, 3.2x5, 5x7 mm package options OE pin location/polarity. Specific configurations are factory-programmed at Samples available with 1-2 week lead times time of shipment, eliminating the long lead times associated with custom oscillators. APPLICATIONS Pin Assignments 100G/200G/400G OTN, coherent optics, PAM4 SDA 7 10G/40G/100G optical ethernet OE/FS/NC 1 6 VDD 3G-SDI/12G-SDI/24G-SDI broadcast video NC/OE/FS 2 5 CLK Servers, switches, storage, search acceleration Test and measurement GND 3 4 CLK+ 8 FPGA/ASIC clocking SCL (Top View) Fixed Frequency Frequency Flexible Pin Descriptions Low Crystal DSPLL Noise Driver DCO 1, 2 Selectable via ordering option Digital Digital OSC Phase Error Phase Loop OE = Output enable FS = Frequency Select NC = No connect Cancellation Detector Filter Flexible Phase Error Formats, 3 GND = Ground 1.8V 3.3V Fractional Operation Divider NVM 4 CLK+ = Clock output Control Power Supply Regulation 5 CLK- = Complementary clock output. Not used for CMOS. OE, Frequency Select Built-in Power Supply (I2C and Pin Control) Noise Rejection 6 VDD = Power supply 7 SDA = I2C Serial Data 8 SCL = I2C Serial Clock 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 3, 2021 1Si549 Data Sheet Ordering Guide 1. Ordering Guide The Si549 XO supports a variety of options including startup 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