The LEV tester circuit of the resistor set high/low electric detecting threshold

Published:2011/6/7 1:57:00 Author:qqtang | Keyword: LEV tester, detecting threshold | From:SeekIC

In the figure is the LEV tester circuit of the resistor(R1~R4) set high/low electric detecting threshold. The threshold voltage can be calculated by voltage distributing formula, when the value is adapted by R1~R4, the LEV threshold of 9-pin is 2.5v, the LEV threshold of 5-pin is 0.8v. When UIN≤0.8V, 7-pin outputs a high LEV, TV is conducting, the it indicates 0 ; when UIN≥2.3V, 8-pin outputs a high LEV, and it indicates 1 , the decimal dp is glowing; when UIN inputs a clock pulse, it indicates a 0 with points; when UIN is in 0.8V～2.3V, both 7 and 8 output low LEV.



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