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Frequency-Flexible Timing Solution for Cost-Sensitive Applications up to 250 MHz

Mon, 03/14/2011 - 10:39am

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Silicon Laboratories Inc. today introduced a family of crystal oscillators (XOs) and voltage-controlled XOs (VCXOs) designed to minimize jitter, system cost and design complexity for a wide range of high-performance, cost-sensitive applications up to 250 MHz. The new Si51x XO/VCXO family provides best-in-class frequency flexibility for networking, communications, storage, server, embedded computing and broadcast video systems and also targets FPGA, serializer/deserializer (SerDes) and multi-rate clocking applications.

The latest addition to Silicon Labs’ portfolio of frequency-flexible crystal oscillators, the Si51x family includes the industry’s first I2C-programmable, low-jitter XOs and the first dual-frequency XO/VCXOs in space-saving 3.2 mm x 5 mm packages. The Si51x family offers drop-in compatibility with fixed-frequency XOs and surface acoustic wave (SAW) oscillators while providing superior frequency flexibility and power supply noise rejection. Featuring 0.8 picosecond (ps) rms jitter across the entire frequency range, the Si51x XO/VCXOs provide up to 2.5X lower jitter than traditional factory-programmable oscillators.

The Si51x XO/VCXOs feature Silicon Labs’ patented DSPLL® technology to generate any frequency from 100 kHz to 250 MHz with 26 parts per trillion frequency programming resolution. Unlike traditional crystal and SAW oscillators that require a unique crystal or SAW resonator for each frequency, the Si51x devices pair a DSPLL clock IC with a single low-frequency crystal. Specific device configurations are programmed during outgoing tests. This efficient mass-customization approach minimizes lead times because there is no need to customize crystals for each new frequency. Silicon Labs can respond quickly to demand upsides, reducing customer inventory stocking levels and associated costs. High reliability and quality are maintained because all Si51x oscillator products share a common manufacturing flow.

Silicon Labs’ Si512/3 dual-frequency XOs are ideally suited for replacing two discrete XOs and a multiplexer in networking, broadcast video and other applications that use multi-rate SerDes devices and FPGAs. The Si514 I2C-programmable XO can be used to replace clock generators that require an external crystal for local clock generation, simplifying design while providing tighter, guaranteed stability by leveraging the Si514?s internal crystal. The Si514 also can be used to replace direct digital synthesis (DDS) clock ICs and digital PLLs that typically use a digital-to-analog converter (DAC) and VCXO for clock synchronization. The Si514 is a flexible choice for prototyping since it can be reprogrammed in-system to any frequency.

The Si51x XO/VCXOs support a wide range of voltage options (1.8, 2.5 and 3.3 V) and output formats (LVPECL, LVDS, CMOS and HCSL), making them ideal for applications that require varying frequencies, formats and power supply voltages. All Si51x devices include on-chip voltage regulation, minimizing the impact of system-level power supply noise on clock jitter and keeping jitter below 1 ps rms jitter even in noisy system environments. This noise immunity is advantageous in FPGA-based systems that rely on tightly regulated switched mode power supplies. By filtering power supply noise inside the device, Si51x XO/VCXOs can be mounted next to FPGAs without requiring external low drop-out regulators for power supply filtering.

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