company blog about Recycle TI Clocks & Timing:Clock Jitter Cleaner,Oscillator,RF PLL & Synthesizer

Recycle TI Clocks & Timing:Clock Jitter Cleaner,Oscillator,RF PLL & Synthesizer

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I. Clock Jitter Eliminator: Purifying Timing Signals to Strengthen the Foundation of System Performance

Clock jitter is a core source of interference in timing signals, leading to data transmission errors and signal desynchronisation. Particularly in scenarios such as high-speed interfaces and high-precision measurements, even minor jitter can cause a significant decline in system performance. The primary function of TI’s clock jitter eliminators (also known as clock jitter filters) is to filter out jitter noise from the input clock signal, producing a stable and clean clock signal. They also offer flexible adaptability to meet the timing requirements of various applications.

TI’s clock jitter eliminator product line is extensive, comprising 36 core products, all of which support the JESD204B protocol. Certain high-end models integrate features such as a VCO (voltage-controlled oscillator), programmable delay and signal loss detection, enabling zero-latency output and compatibility with a variety of interface types, including CML, HSDS, LVCMOS, LVDS, LVPECL, amongst others. The operating voltage range spans 1.7V to 3.465V, with an operating temperature range of -40°C to 125°C; certain high-reliability models can withstand extreme environments ranging from -55°C to 125°C, meeting the stringent requirements of aerospace and defence applications.

Their core technical advantage lies in ultra-low jitter suppression capabilities. Leveraging the integration of TI’s advanced circuit design and BAW technology, they achieve jitter performance below 50fs, perfectly meeting the ultra-high requirements for clock stability in high-speed applications such as 800Gbps and 1.6Tbps Ethernet, and 5G/6G wireless infrastructure. They also support SPI programming and manual/automatic switching functions, enhancing design flexibility. Typical products include the LMK04714-Q1, LMK04832 and CDCE813-Q1. The LMK04832 series covers commercial, industrial and aerospace-grade variants, with a maximum unit price of up to US$47,360 per piece (minimum order quantity of one piece), making it suitable for high-reliability and high-precision applications; The CDCE813-Q1, meanwhile, is widely used in general-purpose applications such as consumer electronics and industrial control, thanks to its integrated EEPROM, compact TSSOP package and excellent cost-performance ratio.

Typical applications include timing for high-speed data converters (ADC/DAC), FPGA/ASIC clock synchronisation, fibre-optic communications, industrial automation and test and measurement equipment. These solutions effectively address timing signal distortion, enhancing the system’s immunity to interference and improving data transmission accuracy. Furthermore, TI provides dedicated application notes detailing jitter cancellation implementation methods to assist engineers in rapidly completing design and debugging.

II. Oscillators: Core Timing Sources, Balancing Stability and Flexibility

Oscillators serve as the ‘source’ of clock systems, responsible for generating the primary clock signal; their frequency stability, jitter performance and reliability directly determine the performance of the entire timing system. TI oscillators leverage BAW technology as their core competitive advantage, overcoming the performance limitations of traditional quartz oscillators to create a comprehensive range of products characterised by low jitter, high stability and high reliability. This range includes fixed-frequency oscillators, differential oscillators and single-ended oscillators, catering to diverse requirements for power, packaging and frequency.

The core technological advantages of TI oscillators lie in the application of BAW resonators. Compared to traditional quartz oscillators, BAW resonators deliver significant improvements in vibration and shock resistance, Mean Time Between Failures (MTBF) and Frequency-in-Time (FIT) performance: They maintain stability of <2ppb/g, with no jitter or frequency degradation occurring before or after a vibration event; under a mechanical shock of 1500g, the frequency deviation is <0.5ppm with no jitter degradation; at 35°C, the frequency-induced time (FIT) failure rate is only 0.3, and the MTBF reaches 3.3 billion hours—equivalent to just 0.3 failures per 1 billion hours of operation—greatly enhancing product reliability in harsh environments.

In terms of product features, TI oscillators are divided into two main categories: single-ended and differential. Single-ended oscillators utilise standard LVCMOS frequencies, with typical jitter of <500fs and frequency stability of ±25ppm or ±50ppm; Differential oscillators support standard frequencies such as LVDS, LVPECL and HCSL, with typical RMS jitter of just 90 fs at 156.25 MHz (12 kHz to 20 MHz), whilst frequency stability also reaches ±25 ppm and ±50 ppm. Some models incorporate FOD technology, enabling flexible clock frequencies from 1 MHz to 400 MHz with a resolution step of <10 ppb. They support glitch-free, programmable output frequencies, and allow output swing and output type to be programmed via an I²C interface either at the factory or in the field. The integrated spread-spectrum clock also reduces system electromagnetic interference (EMI).

Typical products include the LMK6H series, LMK6C series and LMK3H0102. The LMK6H series comprises low-jitter, high-performance BAW fixed-frequency HCSL oscillators, whilst the LMK3H0102 is a BAW-based, reference-less clock generator compatible with PCIe Gen 1 to Gen 7. The CDC6C-Q1 is a low-power, low-ppm BAW fixed-frequency LVCMOS oscillator designed for the automotive sector, with a unit price as low as US$0.403 per piece (minimum order quantity of 1,000 pieces), offering outstanding value for money. Application scenarios span communications equipment, industrial control, automotive electronics, consumer electronics, aerospace and defence, and are particularly suitable for environments requiring high adaptability and frequency stability.

III. RF PLLs and Synthesizers: High-Frequency Timing Cores Empowering High-End Wireless Applications

RF PLLs (Phase-Locked Loops) and synthesizers are core timing components in high-frequency electronic systems, primarily used to generate high-precision, highly stable RF clock signals. They are widely applied in high-end sectors such as wireless communications, aerospace and defence, test and measurement, and satellite communications. TI’s RF PLL and synthesiser product portfolio is optimised for broadband and high-speed applications, offering advantages such as ultra-low phase noise, low power consumption and high flexibility. With phase noise as low as -230 dBc/Hz, these devices exceed the stringent performance requirements of the aerospace, defence, test and measurement, and wireless communications sectors.

Key technical highlights of TI’s RF PLLs and synthesizers include: firstly, low-phase-noise design, which achieves optimal phase-noise performance through the integration of a VCO and PLL; certain models, such as the LMX2571, deliver phase noise of -123 dBc/Hz at a 12.5 kHz offset and -145 dBc/Hz at a 1 MHz offset at 480 MHz; with a standardised PLL noise floor as low as -231 dBc/Hz and spurious performance better than -75 dBc/Hz; secondly, high-speed data converter timing capabilities, featuring clock functions for SYSREF and JESD204B/C devices, enabling precise adaptation to high-speed ADCs and DACs; thirdly, high-reliability design, with certain radiation-hardened and wide-temperature-range products capable of stable operation in space and harsh environments; Fourthly, optimised for low power consumption, reducing current draw for battery-powered portable devices (such as handheld test instruments and wireless microphones); fifthly, flexible RF clock distribution, distributing and fanning out RF clocks with ultra-low added jitter and an extremely low-noise reference.

Typical products are centred on the LMX series, with the LMX2571 being a low-power, extreme-temperature RF synthesiser offering an output frequency range of 10 MHz to 1344 MHz. It integrates a Δ-Σ fractional-N PLL, multi-core VCO, a programmable output divider and two output buffers. It utilises the new FastLock technology, achieving lock-in times as short as 0.14μs, and supports 2-, 4- and 8-level, as well as arbitrary-level, direct digital frequency-shift keying (FSK) modulation. It is suitable for applications such as digital professional duplex two-way radios, satellite communication modems and handheld test and measurement equipment; Furthermore, high-end models such as the LMX1205-EP are high-reliability enhanced products, suitable for extreme applications such as aerospace and defence.

To simplify the design process, TI provides a wealth of design and development resources, including the PLLatinum Simulator Tool, which allows users to create detailed designs and simulations for PLLatinum™ integrated circuits; TICS (Timing and Synthesis) Pro software, used to program evaluation modules (EVMs) for the CDC, LMK and LMX series; and clock tree architecture programming software, which generates system-level multi-chip timing solutions according to system requirements, significantly reducing design cycles.