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New Gigahertz-Speed Dual Analog-to-Digital Converter from National Semiconductor Offers Industry’s Highest Performance at the Lowest Power Consumption

Innovative Architecture of National’s New ADC08D1000 Ideal for Oscilloscopes, Test and Measurement Equipment, Digital Set-Top Boxes and Communications Systems

Sep 16, 2004

September 16, 2004 - National Semiconductor Corporation (NYSE:NSM) today announced a new dual high-performance CMOS analog-to-digital converter (ADC) that consumes significantly less power than competitive products while providing the gigahertz speeds necessary for reliable measurements of high-frequency signals. These high-speed, low-power devices are designed specifically for applications such as digital oscilloscopes, automated test equipment (ATE), base stations, satellites and communications systems requiring direct I/Q down-conversion. As one of the key building blocks in system signal path designs, ADCs accurately capture real-world analog information and convert it for processing in the digital domain.

The ADC08D1000 digitizes two input signals to 8-bit resolution at sampling rates up to 1 GSPS while consuming just 1.6 watts from a 1.9 volt nominal supply. By using the innovative fully programmable dual-edge sampling feature, the product can achieve 2 GSPS sampling from one channel by interleaving the two on-chip converters.  Both coarse and fine timing adjustments are available, allowing the sampling clock for each channel to be calibrated independently in 0.1 pico-second increments.  A three-wire serial bus controls these adjustments, as well as on-chip functionality, and independent gain and offset fine-tuning for I and Q channels. The ultra-low power requirements of the ADC08D1000 enable designers to eliminate fans or heat sinks, saving board space and reducing system cost.

“National’s rapidly expanding portfolio of data converter solutions is enabling dramatic improvements in performance throughout the entire analog signal path,” said Suneil Parulekar, executive vice president, Analog Products Group. “The new ADC08D1000 extends National’s  range of high-speed  products to offer designers a choice of the industry’s lowest-power, highest-accuracy products on the market. Our best-in-class ADCs enable system makers to differentiate their products by offering improved image resolution, enhanced reliability, smaller form-factors and lower power.”

ADC08D1000: A Unique High-Performance Architecture
With more than 10 patents pending on its design, National’s ADC08D1000 is fabricated using the company’s state-of-the-art 0.18-micron, high-performance CMOS process technology. The chip features on-chip auto calibration at power-up that enables low power with high performance.  In addition, it has a unique, performance-enhancing folding/interpolating architecture.  Folding reduces the number of comparators, and interpolation greatly reduces the number of front-end amplifiers required, saving power and reducing the load on the input signal.   The ADC08D1000 has an ideal pulse response and guarantees “no missing codes” over the full operating temperature range of -40 to 85ºC.  This enables the product’s high level of performance and accuracy. In addition, the ADC08D1000 features a National LVDS (low voltage differential signaling) interface, which enables reliable transmission of high-speed signals, while maintaining low noise and distortion levels.

Key Technical Specifications of National’s ADC08D1000
The ADC08D1000 is designed with an extremely low bit-error rate (BER) of 10-18.  At a 1 GHz sampling rate, the ADC08D1000 achieves 0.25 LSB (least significant bits) DNL (differential non-linearity) and 0.35 LSB INL (integral non-linearity), while maintaining 7.5 ENOB (effective number of bits) from DC up to input frequencies of 500 MHz (Nyquist).  Measured crosstalk between the I and Q channels is less than -77 dB.  The dual on-chip sample-and-hold amplifiers deliver excellent dynamic performance over a 1.7 GHz full power bandwidth. 

A Complete Family of High-Performance Single and Dual ADCs
With the introduction of the ADC08D1000, National continues to expand its line of high-performance, low-power 8-to-12 bit ADC offerings.  It joins National’s single ADC081000 high-performance CMOS analog-to-digital converter. These products will be followed closely by a 500 MSPS version and National’s 1.5 GSPS device in the first quarter of 2005. All speed grades in National’s ultra-high-speed portfolio have the same pin-out, allowing the designer to change the sampling rate without changing the board layout. In addition, National is developing higher-resolution 14- and 16-bit pipeline ADCs and continuing to build its low-power, general purpose SAR (successive approximation register) ADCs for broad market applications.   

Pricing and Availability
The ADC08D1000, housed in a 128-lead exposed-pad package, is priced at $219 in 1K volumes.  The product is scheduled for full production release in January 2005 and samples will be available at that time.  More information about the product is available at http://www.national.com/pf/AD/ADC08D1000.html.  To view a high-resolution downloadable photo of the ADC08D1000, visit National's photo gallery at http://www.national.com/company/pressroom/gallery/dcs.html.

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high performance analog devices and subsystems. National’s leading-edge products include power management circuits, display drivers, audio and operational amplifiers, and data conversion solutions. National's key markets include wireless handsets, displays, PCs, networks and a broad range of portable applications. With headquarters in Santa Clara, California, National reported sales of $1.98 billion for fiscal 2004, which ended May 30, 2004. Additional company and product information is available at www.national.com.