NATIONAL SEMICONDUCTOR HOUSES 8-BIT A TO D CONVERTERS IN ULTRA-SMALL PROPRIETARY LEADLESS LEADFRAME PACKAGE (LLP) FOR HIGH DENSITY PORTABLE DESIGNS

September 11, 2000 - National Semiconductor (NYSE:NSM) today introduced a pair of 8-bit ADCs (analog to digital converters) in a proprietary new chip-scale, leadless package design. The ADC08351 and ADC1175-50 A to D converters are both offered in a 24-pin leadless leadframe package (LLP), measuring a scant 4.0mm by 5.0 mm, and a trim 0.8 mm high. The devices require 2.5 times less board area than the alternative 24-pin TSSOP package for the same chip design. National's small form factor package is sized to fit the limited clearance available in small portable camcorders, CD players, mini-disks, digital imaging, communications and other compact handheld consumer designs.

"National's leadless leadframe package meets the growing demand for smaller low-profile ICs for low-power designs required for portable operation," noted Robert Eddy, product marketing director for National's Data Conversion Systems group. "It reinforces National's leadership as a package innovator as well as its ability to respond to the needs of a fast-moving market demanding smaller form factors."

In addition to small form factor, National's LLP offers several major advantages over alternative package designs. Pin pitch is 0.5mm; power dissipation properties include excellent thermal conduction and low thermal resistance achieved by a built-in heat sink and by soldering the exposed pad to a thermal land on the PCB. Low parasitic inductance brings performance benefits to high-speed analog circuits. LLPs can be placed using standard optical/mechanical pick-and-place equipment with 0.50mm placement accuracy.

Ideal for a variety of imaging, video and communications applications, the ADC08351 operates at 42 MSPS, typically consuming just 40mW from a 3V supply. In the power-down mode, the ADC08351's power consumption drops off to just 7mW. It maintains excellent dynamic performance with a superior signal to noise ratio (SNR) of 45dB and a low harmonic distortion (THD) of -51dB at 4.4 MHz input frequency. National's device uses a unique architecture to achieve exceptional Nyquist performance of 7.2 effective bits (ENOB) with 4.4MHz input and 42MHz clock frequency over a temperature range of -40? C to +85? C. Safety features include latch-up resistance and includes short-circuit proof outputs.

The ADC1175-50 operates up to 50MSPS, maintaining superior dynamic performance with input frequencies up to 1/2 the clock frequency. It achieves 6.8 effective bits (ENOB) with a 50MHz sampling rate and 25 MHz input frequency. The combination of low power consumption (125mW typical from a 5V source) and excellent DC and AC characteristics makes the ADC1175-50 ideal for use in video and imaging equipment, both standard and portable, including digital still cameras, set top boxes, camcorders, communications, medical imaging, PC video, digital TV and CCD imaging.

Pricing and Availability
Available now, the ADC08351CILQ in an LLP-24L package is priced at $2.25 in 1000-unit quantities. The ADC1175-50CILQ 8-bit in the same package is $2.50 in 1000s. For more information on the ADC08351 or ADC1175-50, visit National's World Wide Web site at www.national.com/pf/AD/ADC08351.html, www.national.com/pf/AD/ADC1175-50.html, or contact National's Design Support Group at 1-800-272-9959. To view a high-resolution downloadable photo of the ADC08351 and ADC1175-50, visit National's photo gallery at www.national.com/company/pressroom/gallery/dcs.html#adc1175adc08351.

About National Semiconductor
National Semiconductor provides system-on-a-chip solutions for the information age. Combining real-world analog and state-of the-art digital technology, the company's chips lead many sectors of the personal computer, communications, and consumer markets. With headquarters in Santa Clara, California, National reported sales of $2.1 billion for its last fiscal year and has about 10,500 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com.

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