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Multi-Carrier DAC14135 Offers High Resolution, High Sampling Rate, Wide Dynamic Range and Compact Size for under $10

Nov 10, 1999

November 10, 1999 - National Semiconductor Corporation (NYSE:NSM) today introduced the DAC14135, a 14-bit, 135MSPS (mega samples per second) digital-to-analog converter optimized for use in multi-carrier cellular base stations and other non-cellular applications. Featuring high resolution, high sampling rate, wide dynamic range, compact size and an extremely low price, the DAC14135 has many integrated features including a proprietary segmented DAC core, differential current outputs, a band-gap voltage reference and TTL/CMOS-compatible inputs.

"The monolithic DAC14135 complements our leading-edge base station receiver product line by forming the core of the transmitter solution for digital base stations. This allows suppliers to offer base stations with higher performance, at lower cost, smaller size and lower power than current solutions," said Kurt Rentel, marketing manager for National's wireless base station products. "Wireless service providers are competing on performance with their products, our solution helps them by offering the necessary performance right from the start."

The DAC14135 was developed to meet key customer demands for a DAC that simplifies multi-carrier transmitter chains in wireless base stations. Traditional wireless transmitters generate each RF carrier using a transmitter chain that incorporates its own DAC or DACs for conversion.

The DAC14135's wide dynamic range allows the combining of RF carriers at one time, eliminating the need for DACs to be allocated for each individual carrier. This ?multi-carrier? transmitter design reduces the number of parallel transmitter chains, which results in lower cost and size by eliminating expensive analog components like mixers, filters, and amplifiers.

Other non-cellular applications intended for the DAC14135 include wireless local loop base stations, DDS (Direct Digital Synthesis), ADSL (Asymmetrical Digital Subscriber Line) and HFC (Hybrid Fiber Coax) modems, and instrumentation.

Key Features and Benefits
The DAC14135?s key features provide major benefits:

  • 14-bit resolution yields a wide dynamic range;
  • 85dBc SFDR (Spurious Free Dynamic Range) at 1MHz and 70dBc SFDR at 20MHz results in multi-tone transmission capability with a wide range of signal amplitudes;
  • 135MSPS sample rate results in better transmitter performance and relaxes reconstruction filter requirements;
  • 185mW power dissipation offers low power for increased transmitter efficiency;
  • 48-pin TSSOP package results in small transmitter board and saves space in micro- and pico-cell systems.



is produced on National?s 0.5-micron CMOS 5V process. It operates from a single +5V power supply. The digital power supply can also operate from +3.3V for lower power consumption and compatibility with +3.3V data inputs. The DAC14135 is specified over the industrial temperature range of -40C to +85C.

Pricing and Availability

Available now, the


is priced at $9.75 each in 1K quantities. It is housed in a space-saving 48-lead TSSOP. For more information on the DAC14135, visit National?s World Wide Web site at


, or contact National?s Customer Response Group at 1-800-272-9959.

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 billion for its last fiscal year and currently has about 11,000 employees worldwide. Additional company and product information is available on the World Wide Web at