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Simplify design tasks with pin-compatible ADCs

Posted: 24 Oct 2008     Print Version  Bookmark and Share

Keywords:ADCs  pin compatibility  resolution 

Choosing an A/D converter can be the toughest choice a system designer makes. The converter's resolution and sampling rate determine the system's performance. Yet, often the design is based on a series of assumptions that can't be verified until the prototype system is put through its paces.

Depending on results, the system ma y b e overspecified and a lower speed or resolution converter would work or be underdesigned, so a faster or higher resolution converter is needed. In the former case, there is an opportunity for cost reduction through a cheaper converter. In the latter case, major design changes increase time to market and increase development cost. In addition, any change in a working design also introduces risk—the risk of "improving" a working design into a nonworking design. And the best way to minimise risk is to future-proof the design by using a single layout and converters that are pin compatible.

This application note by Robert M. Clarke for Analog Devices explains the common pinout and footprints of single and dual high-speed ADCs and how a designer can take advantage of their pin compatibility. It lists the pin functions for the converters and shows the differences in the data out bits so a user is able to design a single board that can accommodate different resolution and speed to changing the converter's speed or resolution without changing a layout, thus saving time-to-market.

View the PDF document for more information.

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