Ultra Series Crystal Oscillator Si545 Data Sheet Ultra Low Jitter Any-Frequency XO (80 fs), 0.2 to 1500 MHz KEY FEATURES th The Si545 Ultra Series oscillator utilizes Skyworks Solutions advanced 4 genera- Available with any frequency from 0.2 tion DSPLL technology to provide an ultra-low jitter, low phase noise clock at any MHz to 1500 MHz output frequency. The device is factory-programmed to any frequency from 0.2 to Ultra low jitter: 80 fs Typ RMS 1500 MHz with <1 ppb resolution and maintains exceptionally low jitter for both inte- (12 kHz 20 MHz) ger and fractional frequencies across its operating range. The Si545 offers excellent Excellent PSNR and supply noise reliability and frequency stability as well as guaranteed aging performance. On-chip immunity: 80 dBc Typ power supply filtering provides industry-leading power supply noise rejection, simplify- 7 ppm stability option (40 to 85 C) ing the task of generating low jitter clocks in noisy systems that use switched-mode power supplies. Offered in industry-standard footprints, the Si545 has a dramatically 3.3 V, 2.5 V and 1.8 V V supply DD simplified supply chain that enables Skyworks to ship custom frequency samples operation from the same part number 1-2 weeks after receipt of order. Unlike a traditional XO, where a different crystal is LVPECL, LVDS, CML, HCSL, CMOS, and required for each output frequency, the Si545 uses one simple crystal and a DSPLL Dual CMOS output options IC-based approach to provide the desired output frequency. This process also guar- 2.53.2, 3.25, 57 mm package options antees 100% electrical testing of every device. The Si545 is factory-configurable for Samples available with 1-2 week lead a wide variety of user specifications, including frequency, output format, and OE pin times location/polarity. Specific configurations are factory-programmed at time of shipment, eliminating the long lead times associated with custom oscillators. APPLICATIONS Pin Assignments 100G/200G/400G OTN, coherent optics 10G/40G/100G optical ethernet OE/NC 1 6 VDD 3G-SDI/12G-SDI/24G-SDI broadcast video NC/OE 2 5 CLK- Datacenter Test and measurement Clock and data recovery 3 4 CLK+ GND FPGA/ASIC clocking (Top View) Fixed Frequency Pin Descriptions Frequency Flexible Low Crystal DSPLL Noise Driver 1, 2 Selectable via ordering option DCO OE = Output enable NC = No connect Digital Digital OSC Phase Error Phase Loop Cancellation Detector Filter Flexible 3 GND = Ground Phase Error Formats, 1.8V 3.3V Fractional Operation 4 CLK+ = Clock output Divider NVM 5 CLK- = Complementary clock output. Not used for CMOS. Power Supply Regulation Control 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 3, 2021 1Si545 Data Sheet Ordering Guide 1. Ordering Guide The Si545 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. Sky- works Solutions provides an online part number configuration utility to simplify this process. Refer to