Clock generators deliver low jitter for consumer applications

Dallas, Tex. — Texas Instruments Inc. (TI) has introduced a family of highly-programmable, one to four phase-lock loop (PLL) clock generator devices with the capability to generate up to nine output clock sources from a single input frequency. The CDCE9xx and CDCEL9xx family of clock generators deliver very low jitter at 60 picoseconds typical for consumer applications.

The CDCE9xx and CDCEL9xx clock generators ranges with one to four PLLs offer very low jitter at 60 picoseconds typical. The CDCE9xx devices provide either 2.5-V or 3.3-V outputs, while the CDCEL9xx provides 1.8-V outputs, enabling the low-power capability needed for portable devices. Each PLL supports spread-spectrum clocking (SSC) to reduce electro-magnetic interference (EMI) for compliance with EMC regulations.

Each output can be programmed in-system for any clock frequency up to 230 MHz. 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, said TI. Consumer applications include IP set-top boxes or phones, digital media systems such as digital televisions, streaming media and printers, navigation systems and portable devices.

In addition, the clock generator family provides a variety of programmability options including the ability to program and customize the devices in-system through I2C and an 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, said TI. The devices further simplifies system design by replacing a number of components in the system including crystals, oscillators, buffers and PLLs.

The clock devices are optimized 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-analog converter or codec and Ethernet or USB controller. The on-chip voltage-controlled crystal oscillator (VCXO) allows frequency synchronization of different data streams.

Pricing: All in quantities of 1,000.

  • CDCE949 2.5/3.3V with 4 PLLs: $2.20
  • CDCE937 2.5/3.3 V with 3 PLLs: $2.00
  • CDCE925 2.5/3.3 V with 2 PLLs: $1.80
  • CDCE913 2.5/3.3 V with 1 PLL: $1.60
  • CDCEL949 1.8 V with 4 PLLs: $2.20
  • CDCEL937 1.8 V with 3 PLLs: $2.00
  • CDCEL925 1.8 V with 2 PLLs: $1.80
  • CDCEL913 1.8 V with 1 PLL: $1.60

Availability: The CDCE949 is available now in a 24-pin TSSOP package. The remaining devices in the family will be available throughout 2007 in 20-pin, 16-pin and 14-pin TSSOP packages. Evaluation modules (EVMs) are available.
Product information: CDCE949 clock generators and Clocks and Timers Selection Guide

Texas Instruments Inc. , 1-800-477-8924,

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