|
|
Article: Convert signals to proper logic levels.
- Article from:
- EDN
- Article date:
- February 5, 2009
CopyrightCOPYRIGHT 2009 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)
|
Abel Raynus, Armatron International Inc, Malden, MA
Edited by Martin Rowe and Fran Granville
When designing a test station incorporating a microcontroller, you often face voltages in the test that exceed the maximum input level permitted for the microcontroller. For example, if a microcontroller uses a 5V power supply, then the maximum input signal should also be 5V. When a test voltage exceeds 5V, you might think to reduce the voltage with a voltage divider. A voltage divider can influence the DUT (device under test), however. So, a signal conditioner needs high input impedance. Also, the signal conditioner's output signals should match the logic levels ...