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Logarithmic LED Panel Display Has 72dB Range

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Abstract: This application note presents a simple, stand-alone panel-display circuit that drives a 12-LED logarithmic column. The LED column is a 12-step log indicator with 6dB step height, forming a total column range of 72dB. The circuit's accuracy and stability are defined by the specifications for the design's ADC. The MAX1276 12-bit ADC is featured.
Maxim > App Notes > A/D and D/A Conversion/Sampling Circuits Display Drivers

Keywords: logarithmic panel displays, LED panels, analog-digital converters, ADCs Sep 21, 2009

APPLICATION NOTE 4442
Logarithmic LED Panel Display Has 72dB Range
By: Tamer Mogannam


Abstract: This application note presents a simple, stand-alone panel-display circuit that drives a 12-LED logarithmic column.
The LED column is a 12-step log indicator with 6dB step height, forming a total column range of 72dB. The circuit's accuracy
and stability are defined by the specifications for the design's ADC. The MAX1276 12-bit ADC is featured.

This design idea appeared in the October 31, 2006 issue of EE Times magazine.

Panel-level logarithmic-column displays are usually built i……
Logarithmic LED Panel Display Has 72dB Range
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