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Dual, quad ADCs promise high speed, low power

Posted: 19 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:analog to digital converters? LVDS output? CMOS output?

TI's dual and quad ADCs

Texas Instruments Inc. (TI) unveiled a new family of two- and four-channel 12bit and 14bit ADCs featuring high speed, low power and high performance housed in tiny 9-by-9mm packages. The ADS6000 pin-compatible family offers designers an easy upgrade path with a range of resolutions, speed and performance options tailored to meet the requirements of advanced communications, radar and imaging, test and measurement, medical, and video applications.

Device options
The family consists of dual and quad, 12bit and 14bit ADCs available in speeds of 80-, 105- and 125MSps. Each device in the family delivers spurious-free dynamic range (SFDR), high SNR, high IF capability and low power per channel. By incorporating single- or dual-stream serialized LVDS outputs, TI claims the devices reduce board space by 60 percent compared to CMOS output solutions.

Through an SPI interface, the ADS6000 family provides programmable options such as coarse and fine gain controls to trade a small amount of SNR for a significant increase in SFDR at high IFs, enabling the customer to tailor the performance to the specific application requirements. Designers are also able to optimize the LVDS output configurations by adjusting the driver currents and internal termination resistors to reduce power consumption, improve signal integrity and ease data capture.

The quad, 12bit, 125MSps ADS6425 provides high performance at 70.3dB SNR and 83dB SFDR at 50MHz IF in the nominal state, with the ability to reach 86dB SFDR through gain settings. The 14bit, 125MSPS ADS6445 provides an upgrade path for customers requiring higher resolution.

Consuming only 410mW or 420mW per channel at 125MSps, the ADS6425 and ADS6445 allow higher system integration and greater flexibility as well as many other system benefits including enhanced resolution for object tracking and discrimination in radar systems and high sample rate and resolution for increased bandwidth and advanced medical imaging capability. In addition, ADS6425 and ADS6445 provide higher performance, smaller form factor and extended battery life for portable test equipment as well as improved sensitivity and reduced BOM for receivers in wireless infrastructure. The devices also offer increased density and sample rate for smaller form factors in high-end video equipment.

Quick market penetration
Easy-to-use evaluation modules and deserializer cards available from TI provide quick and cost-effective evaluation to help customers speed the design process for quicker market penetration. TI also offers a wide variety of parts to complete the signal chain. High-speed, low-noise amplifiers, such as the THS9001 and THS4509, allow the ADS6425 to operate to its full input bandwidth. The CDCM7005 low-skew clock synchronizer provides low-jitter clocking to maximize SNR performance. For parallel transmission paths, TI can provide multi-channel digital-to-analog converters and digital up/down converters such as the DAC5672 and GC5016.

The ADS6425 is available in a 64-pin Pb-free QFN package with samples, evaluation modules and deserializer solution available at

Pricing ranges from $25.05 for the 80MSps ADS6223 to $132.30 for the 125MSps ADS6445, in 1,000-piece quantities. Samples of the remaining members of the family including serialized LVDS and parallel-output, dual ADCs are available through the factory with volume production scheduled for the 2H 2007.

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