A-To-D converter of the successive-approximation type

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340347DA, 340347M, H03K 1302, H03K 1308

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active

045477663

ABSTRACT:
An integrated-circuit analog-to-digital converter of the successive-approximation type formed on a single monolithic chip. The converter is made by a diffusion process wherein certain portions of the chip are formed with normal-mode linear transistors, and other portions are formed with inverted mode I.sup.2 L transistors. The normal-mode transistors provide a switchable current-source DAC, a set of three-state output buffers, and a comparator. The inverted mode transistors provide an internal clock and successive-approximation control circuitry for the DAC. The chip also includes a voltage reference to provide for absolute analog-to-digital conversions.

REFERENCES:
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patent: 3965666 (1976-06-01), Williams
patent: 4007385 (1977-02-01), Chapron
patent: 4009397 (1977-02-01), Mulder et al.
patent: 4013901 (1977-03-01), Williams
patent: 4158782 (1979-06-01), Price, Jr.
patent: 4178584 (1979-12-01), Davis
patent: 4227185 (1980-10-01), Kronlage
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-46 to II-48; I-55 to I-59.
Dooley, A Complete Monolithic 10-Bit D/A Converter, IEEE International Solid-State Circuits Conference, Digest of Technical Papers, pp. 12-14, Feb. 14, 1973.
Hart et al, Bipolar LSI Takes a New Direction with Integrated Injection Logic, Electronics, Oct. 3, 1974, pp. 111-118.

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