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TI offers new jitter cleaner with 'lowest phase in class noise'

Posted: 01 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? cdcm7005? clock synthesizer? jitter cleaner?

Texas Instruments Inc. recently unveiled a clock synthesizer and jitter cleaner that offers one of the lowest phase noise and jitter in its class. According to the company, this new product addresses customers' growing requirement for higher performance and increased design flexibility in applications such as 2.5G/3G wireless base stations, data communications, medical imaging, and test and measurement.

The CDCM7005 provides precise, stable frequencies for signal-chain devices such as analog-to-digital converters (ADC), digital-to-analog converters (DAC), digital upconverters (DUC) and digital downconverters (DDC). It provides a phase noise of -219dBc/Hz (PLL figure of merit), phase jitter performance of 162fs (LVPECL) and 232fs (LVCMOS), and maximum output skew of 20ps.

The CDCM7005 also offers features that maximize design flexibility, including serial peripheral interface (SPI) logic for programming and individual support control. It synchronizes a voltage-controlled crystal oscillator (VCXO) frequency up to 2.2GHz (LVPECL) to one of two reference clocks to deliver high-frequency, clean clock outputs. The outputs can be divided by 1, 2, 3, 4, 6, 8 or 16 divide ratios and delivered at LVCMOS and LVPECL levels.

Other useful features include the device's bias voltage (VBB) pin, which allows it to supply the correct voltage to a single-ended VCXO, eliminating the need for external resistors and thereby simplifying the design. In addition, the CDCM7005 supports frequency hold-over mode and fast-frequency locking for failsafe and increased system redundancy.

The 3.3V CDCM7005 is available in industrial temperature range (-40C to 85C) in either a 64-pin, 0.8mm ball-grid array (BGA) or 48-pin, 0.5mm quad flat no-lead (QFN) package. Suggested resale pricing in 1,000-piece quantities is $10.75. An evaluation module is also available.

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