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TI touts fastest 14-bit ADC at 400 MSPS

Posted: 10 Aug 2007     Print Version  Bookmark and Share

Keywords:BiCom3 process technology; AFE design; on-chip buffer amplifier 

Texas Instruments Incorp has introduced what it claims as the industry's fastest monolithic 14-bit analogue-to-digital converter at 400MSPS. The new ADC provides performance of 11.1 effective number of bits at this speed, enabling high-bandwidth applications such as test and measurement instrumentation, software-defined radio, radar systems and communication instrumentation that were previously confined to lesser resolution ADCs.

Enabled by TI's proprietary BiCom3 process technology, the ADS5474 integrates an on-chip buffer amplifier to ease analogue front-end design. The buffer amplifier eliminates sample-and-hold kick-back and provides a high input impedance over time and frequency, simplifying the AFE design for wide bandwidth applications from DC to intermediate frequencies well above 200 MHz. Additionally, the ADS5474 is pin-for-pin compatible to the ADS5463 12-bit, 500-MSPS ADC, in a space-saving 14 x 14-mm package, providing an easy design path across multiple systems using TI ADCs.

The 400 MSPS sample rate provided by the ADS5474 with 70-dBFS signal-to-noise ratio through first Nyquist and 69-dBFS SNR through second Nyquist offers a number of benefits to the customer in these applications. It improves transmit power amplifier linearisation and efficiency when used in conjunction with a digital pre-distortion algorithm, lowering total system cost; enables sampling of larger bandwidths in radar systems, resulting in enhanced tracking resolution and object discrimination, allows software-defined radios to implement a greater number of standards with higher sensitivity and enables 14-bit resolution with 200-MHz bandwidth for high-speed digitisers, spectrum analysers, test and measurement equipment and general data acquisition system.

TI further eases customers' designs with the entire high-performance signal chain offering. For example, customers are able to combine the ADS5474 with a TI high-speed amplifier (such as THS4520, THS4509 or THS9001) and clock synchroniser and jitter cleaner (CDCM7005). In addition, systems solutions will benefit from TI's portfolio of high performance digital-to-analogue converters, RF solutions, and digital up and down converters.

The ADS5474 is available now in an 80-pin TQFP PowerPAD package (14 mm x 14mm) and is priced at Rs.6,067.24 ($150.00) each in 1,000-piece quantities.

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