Analog-Digital Conversion by Walt Kester

By Walt Kester

Facts Converter Histories
Fundamentals of Sampled information Systems
Data Converter structure, procedure expertise, checking out, Interfacing, aid Circuits, functions, layout thoughts

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Instead, the two chips were designed so that a set of wire bonds between the two chips (in addition to the usual ones to the package pins) were all that were necessary to assemble a 12-bit accurate DAC in an IC package. In the original AD562, one chip contained the thin film resistor network (including the bit weight-setting resistors and output gainsetting resistors), and the other chip contained the reference control amplifier and the current switches for the 12 bits. As the processing matured, the manufacture of larger chips became more practical.

37C). It, of course, provided further cost reduction and reliability improvement, compared to the 3- and 11-chip versions. Finally, in 1984, this popular device was offered in a low-cost plastic DIP package. Thus, in approximately 10 years, the DAC80 evolved from a relatively high-cost hybrid to a highvolume commodity IC. Another excellent example of hybrid technology was the AD572 12-bit, 25-µs SAR ADC introduced in 1977. The AD572 was complete with internal clock, voltage reference, comparator, and input buffer amplifier.

The digital audio market (both professional and consumer) generated a demand for Σ-∆ ADCs with higher throughput rates and greater resolution; and the precision measurement market required 20+ bit resolution, although at much lower throughput rates. Both these needs would be addressed during the 1990s by an explosion of ADCs and DACs using the Σ-∆ architecture. 51 ANALOG-DIGITAL CONVERSION Monolithic Flash ADCs of the 1980s As previously mentioned, the rapidly growing digital video market, coupled with the introduction of the TRW TDC-1007J 8-bit, 30-MSPS flash ADC in 1979, spurred many IC manufacturers to develop similar, but lower powered flash ADCs with resolutions ranging from 4- to 10-bits, and sampling rates as high as high as 500 MSPS.

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