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TI Introduces Hot-Programmable, Highly Stable Clock Multiplier for Consumer Applications

In-System Spread Spectrum Clocking Eases Audio and Video Designs

Dec 8, 2005

DALLAS (Dec. 8, 2005) - Texas Instruments (TI) (NYSE: TXN) today announced a programmable clock multiplier with low jitter of 60 psec and in-system spread spectrum adjustment that improves performance, simplifies development and saves cost in consumer applications. Designers can hot program the device's three phase locked loop (PLL) components in-circuit to generate six output clocks from a single source for any frequency up to 167 MHz, which speeds development of equipment such as digital set top boxes, digital televisions (DTV), DVD players, audio/video (A/V) receivers and printers (see www.ti.com/sc05255). The device is well-suited for clocking high-performance processors, including DaVinciTM products.

The CDCE906 provides advantages to help designers meet the performance requirements of consumer applications. For example, the high-resolution PLL dividers of the CDCE906 provide a very low-jitter clock from a single 27-MHz crystal clock and feature zero-PPM output clock error for most A/V frequencies and applications. This enables customers to achieve precise video and audio clock performance, including requirements for high-performance audio data converters like the PCM1850 stereo audio analog-to-digital converter for DTVs.
Another key performance enhancement is provided by the device's hot-programmable spread spectrum clocking (SSC), which lowers system electromagnetic interference (EMI) and helps reduce the need for a metal shield to block EMI. Hot-programmability enables designers to adjust the level of SSC on the fly, so they can rapidly fine-tune to optimize the system for EMI compliance qualification and also reduce the need for board redesigns for different applications. Programmable output slew-rate control and selectable output voltages of 2.5 V and 3.3 V further reduce system EMI. System performance also benefits from the device's extremely low jitter of 60 psec.
Often, designers of A/V equipment must clock several devices such as a digital signal processor (DSP) or application-specific integrated circuit (ASIC) on their system board. The CDCE906 makes this process easier and faster and reduces system costs by providing multiple programmable outputs. It can accept a differential, LVCMOS or crystal input and generate six clocks from a single clock source. Using on-chip EEPROM technology, designers can easily program and save the device's register settings in non-volatile memory so that no re-programming is required at power-up. In addition, designers can use the 2-wire SMBus interface to dynamically reprogram the outputs while the device is in the system.
The CDCE906 is the latest in TI's extensive portfolio of high-performance analog and DSP products for audio applications, including audio data converters, the AureusTM family of audio DSPs, PurePath DigitalTM audio amplifiers and Class-D audio amplifiers. TI provides the silicon, software, systems expertise and support for the entire audio signal chain, enabling customers to get to market quickly. For more information see www.ti.com/audio. In addition, TI offers high-performance power management products for consumer applications (power.ti.com).
Information on the complete line of clock solutions from TI is in the Clocks and Timers Selection Guide, available at www.ti.com/clocks

Availability and Pricing

The CDCE906 is sampling today and will be in full production in 1Q2006. Suggested resale pricing is $2.60 each in 1,000-unit quantities. A development kit and programming kit will be available to simplify PLL design and programming. The device is 3.3 V supplied, operates in the commercial temperature range from 0ºC to 70ºC and is packed in a 20-pin thin shrink small outline package (TSSOP) package.