By Walt Kester
Info Converter Histories
Fundamentals of Sampled facts Systems
Data Converter structure, method expertise, checking out, Interfacing, help Circuits, purposes, layout suggestions
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Additional info for Analog-Digital Conversion
When higher accuracy is required, lower tempco resistors are needed, and some means of post-fabrication adjustment is desirable. 3 DATA CONVERTERS OF THE 1970S Thin film resistors exhibit low tempcos and can be trimmed with a laser—they are well suited for use in data converters. By the mid 1970s, Analog Devices had developed considerable expertise, not only the deposition of thin film resistors, but also trimming at the wafer level. The Analog Devices' AD562, designed by Bob Craven and introduced in 1974, was originally a "compound monolithic" manufactured using two IC chips mounted in the same package, without the traditional hybrid substrate for mounting and interconnection.
Many of the data converters of the 1960s were in the form of digital voltmeters which used integrating architectures, although Adage introduced an 8-bit, 1-MSPS sampling ADC, the Voldicon VF7, in the early 1960s (Reference 5). 18: HS-810, 8-bit, 10-MSPS ADC Released by Computer Labs, Inc. in 1966 In addition to the widespread proliferation of discrete transistor circuits in the 1960s, various integrated circuit building blocks became available which led to size and power reductions in data converters.
4 DATA CONVERTERS OF THE 1980S would later be replaced by the ADV-series of CMOS video RAM-DACs which included on-chip color palette memory as well as the basic DAC function. Monolithic ADCs of the 1980s The two-chip AD574, introduced in 1978, was well on its way to becoming an industry standard converter by the time of the introduction of the single-chip AD574 12-bit, 35-µs SAR ADC in 1985. Since that time, this converter did become an industry standard, and is still in production today. 44 lists some of the important monolithic ADCs introduced during the 1980s.
Analog-Digital Conversion by Walt Kester