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Article: PC and DACs generate two simple analog outputs.(personal computer and digital to analog converters)(Technology Information)(Brief Article)(Statistical Data Included)
- Article from:
- EDN
- Article date:
- October 14, 1999
- Author:
CopyrightCOPYRIGHT 1999 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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THE SIMPLE AND INEXPENSIVE circuit in Figure 1 generates two PC-controlled analog reference voltages. You supply a wall-adapter supply and a parallel connector, and the circuit is ready to run. The circuit uses two 12-bit AD7243 DACs, which require only one supply voltage. These converters also include internal references, minimizing the number of external components.
[Figure 1 ILLUSTRATION OMITTED]
Simple software uses the parallel port to communicate with the converters. The two converters connect in series with a connection of their Sync and Ldac inputs. This arrangement makes it possible for only three wires to drive the circuit.
The value ...