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Clock synthesizer maximizes design flexibility

Dallas — Texas Instruments Inc. introduced a clock synthesizer and jitter cleaner that is said to offer the lowest phase noise and jitter in its class.

The device addresses customers' growing requirement for higher performance and increased design flexibility in applications such as 2.5G/3G wireless basestations, data communications, medical imaging, and test and measurement.

The CDCM7005 provides precise, stable frequencies for signal-chain devices such as analog-to-digital converters (A/D converters), digital-to-analog converters (D/A converter), digital upconverters and digital downconverters. It offers the industry's lowest phase noise of -219 dBc/Hz (PLL figure of merit), lowest phase jitter performance of 162 fs (LVPECL) and 232 fs (LVCMOS), and maximum output skew of 20 ps, according to TI. This performance allows data converters such as A/D converters to be undersampled at higher input frequencies while delivering the highest signal-to-noise ratio.

The CDCM7005 offers features that maximize design flexibility, including serial peripheral interface (SPI) logic for programming and individual support control. The device synchronizes a voltage-controlled crystal oscillator (VCXO) frequency up to 2.2 GHz (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 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 3.3-V CDCM7005 is available today in the industrial temperature range in either a 64-pin, 0.8-mm BGA or 48-pin, 0.5-mm QFN package. Suggested pricing in 1,000-piece quantities is $10.75. Click here for the CDCM7005 data sheet.

Texas Instruments , 1-800-477-8924, www.TI.com.

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