12-BIT PLUS SIGN, SELF-CALIBRATING A D CONVERTERS FROM NATIONAL FEATURE SERIAL I O Serial I O (MICROWIRE(tm), SPI, and QSPI Compatible); Analog Input Sample Hold Function; Power-Down Mode; Self-Calibrating Architecture.

SANTA CLARA, Calif.--(BUSINESS WIRE)--Aug. 14, 1995--Targeting cost-conscious data conversion applications such as pen-input Personal Digital Assistants (PDA's), National Semiconductor has developed a set of three 12-bit plus sign, self-calibrating analog-to-digital (A/D) converters with serial I/O and a configurable input multiplexer. Strengthening National's line of products that shape information, the ADC12130, ADC12132, and ADC12138 all feature self-calibrating architecture that minimizes linearity, zero and full-scale errors. In addition, an on-board sample-and-hold circuit reduces the need for external components, minimizing cost and space. Power consumption for all three ADCs is a low 33mW (max) for a conversion time of 8.8 microns (max).

The devices contain a software-programmable multiplexer which simplifies configuration and printed circuit board design. Data word length is also software-programmable. Design is further simplified through the use of a variety of serial interface protocols. These protocols include MICROWIRE(tm), SPI, and QSPI.

The ADC12132 has a two-channel multiplexer while the ADC12138 has an eight-channel multiplexer. All differential multiplexer outputs and A/D inputs are available on separate pins. The ADC12130 has a two-channel multiplexer with multiplexer outputs and A/D inputs internally connected.

The analog inputs can be configured to operate in various combinations of single-ended, differential, or pseudo-differential modes. A fully differential unipolar analog input range (OV to +5V) can be accommodated with a single +5V supply. In the differential modes, valid outputs are obtained even when the negative inputs are greater than the positive inputs because of the 12-bit plus sign output data format.

When purchased in quantities of 1,000, the ADC12130CIN, available in DIP packaging, and the ADC12130CIWM, in a wide-body SO package, are priced at $3.06 each, and the ADC12132CIMSA, in a TSSOP package, is priced at $3.16 each. In the same quantities, the ADC12138CIN, available in a DIP package and the ADC12138CIWM in a wide-body SO package, are priced at $3.34 each, while the ADC12138CIMSA, in a TSSOP package, is priced at $3.44 each.

For a data sheet, or more information about the ADC12130, ADC12132, the ADC12138 or other National Semiconductor products, please contact the National Semiconductor Customer Response Group at 1-800-272-9959.

National Semiconductor Corporation provides technologies for moving and shaping information. The company focuses on four key areas -- communications, consumer, industrial, and personal systems. National Semiconductor is headquartered in Santa Clara, California, and has 22,300 employees worldwide.

CONTACT: National Semiconductor Corporation

Gerry Ziegler, 408/721-4319

Scott Brown, 408/721-2302

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