Generators produce nine clocks from a single input

Programmable clock generator devices can be used to generate up to nine output clock sources from a single input frequency.

A new family of highly programmable one to four PLL clock generator devices from Texas Instruments can be used to generate up to nine output clock sources from a single input frequency.

Each output can be programmed in-system for any clock frequency up to 230MHz.

These features provide a number of system benefits such as reduced power consumption, shorter lead time and the flexibility to easily upgrade the clock without redesigning the system.

These benefits ultimately reduce cost for a broad range of consumer applications such as IP set-top boxes or phones, digital media systems such as digital televisions, streaming media and printers, navigation systems and portable devices.

The new CDCE9xx and CDCEL9xx family of clock generators ranges from one to four PLLs with very low jitter at 60ps typical.

The CDCE9xx devices provide either 2.5 or 3.3V outputs, and the CDCEL9xx provide 1.8V outputs, enabling the low-power capability needed for portable devices.

Each PLL supports spread-spectrum clocking to reduce EMI.

The family provides a variety of programmability options including the ability to program and customise the devices in-system through I2C and EEPROM.

By offering footprint compatibility across the family, designers can adapt the system design easily without changing hardware, which reduces cost and enables the designer to simply increase or decrease the number of clock outputs.

The new family of devices further simplifies system design by replacing a number of components in the system including crystals, oscillators, buffers and PLLs.

The new clock devices are optimised to work with TI's DaVinci-based processors by generating any audio, video, processor or interface clock to drive the digital processor, audio digital-to-analogue convertor or codec and Ethernet or USB controller.

The on-chip voltage-controlled crystal oscillator (VCXO) allows frequency synchronisation of different data streams.

The CDCE949 is available now in 24-pin TSSOP package.

The remaining devices in the family will be available throughout 2007 in 20-, 16- and 14-pin TSSOP packages.

In addition, modules are available to evaluate the performance of the family.

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