Clock generators enable more reliable telecomms

30th September 2015
Nat Bowers

Providing ultra-low jitter of 100fs and flexible, unique pin control options, a family of clock generators has been introduced by Texas Instruments. Compared to conventional reference clock solutions, the LMK033x8 clock generators' jitter performance enables system designers to optimise system timing margins and bit error rate to reduce data transmission errors.

This enables more reliable communications, networking, server, computing and high-performance industrial equipment. The LMK03318 and LMK03328 clock generators also offer versatile features to reduce design cycle time by facilitating easy prototype design and evaluation.

The 100fs RMS performance is enabled, over multiple integration bandwidths (1KHz to 5MHz and 12KHz to 20MHz), by up to two high-performance PLLatinum fractional-N PLLs with eight outputs. The unique pin-mode control feature enables designers to easily select from 71 pre-programmed frequency startup plans compared to one-time programmable memory offered by competitors. Integrated EEPROM enables easy customisation, while the I2C interface gives system designers complete control of device configuration.

Glitchless fine/coarse frequency margining enables designers to simplify the stress and compliance testing of their systems during design verification and process verification of prototypes. Integrated LDO regulators provide immunity to power-supply noise without requiring complex filter designs.

The LMK03328EVM is available today and the LMK03318EVM will be available in 4Q 2015 from the TI store and authorised distributors for $299. TI’s WEBENCH Clock Architect tool simplifies the design process for the LMK033x8 family, as well as for other TI clock and timing devices. The tool can recommend a single- or multiple-device clock-tree solution from a broad database of devices to meet system requirements. It features PLL filter design, phase-noise simulation and the ability for designers to optimise clock-tree designs for their performance and cost requirements.

Support is available in the TI E2E Community Clock and Timing forum, where engineers can search for solutions, get help, share knowledge and solve problems with fellow engineers and TI experts.

LMK033x8 clock generators are supplied in a 7x7mm QFN package. The LMK03328 dual-PLL eight-output clock generator is available today and priced at $10.00 in 1,000 unit quantities. The LMK03318 single-PLL eight-output clock generator will be available in 4Q 2015 and will be priced at $7.50 in 1,000 unit quantities.

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