Design Article
Build a simple 1-wire digital/analog converter (DAC)
Bernhard Linke, <br>Maxim Integrated Products Inc.
9/29/2009 7:00 AM EDT
Among devices available with a 1-wire interface, the best known are memories, temperature sensors, battery monitors, and addressable switches. One-wire ADCs are also available, but there are no 1-wire DACs. You can, however, build a simple 1-wire DAC using addressable switches. This article, by Bernhard Linke of Maxim, shows how to do this, and it includes full analysis as well as the circuit schematic.
To read the entire article (no registration required), click here.
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0xC0FFEE
9/29/2009 6:44 PM EDT
seems like an R-2R ladder would be better than binary weighted resistors here.
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NickAllen
10/8/2009 9:58 AM EDT
"U1s open-drain output transistors (P0-P3) either conduct (logic 0) or present a high impedance (logic 1)."
Isn't it time to stop thinking that high voltage equals "1", etc.? A transistor conducting is "ON". ON = TRUE = logic 1. Embrace the active-low and active-high logic concepts. MIL-STD-806 (the most intelligent military document ever?) did this decades ago. Then explore the use of DeMorganization of logic symbols to indicate actual circuit functions, such as using a NAND gate to OR two active-low signals.....
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