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Upgrade panel-meter range and precision

Posted: 31 Jan 2011 ?? ?Print Version ?Bookmark and Share

Keywords:voltmeter IC? MAX1499? SPI interface?

The technique discussed in this application note lets you easily double the input-voltage range of a typical voltmeter IC (to 400mV), and extend its precision to 4? digits (40000 counts).

The input-voltage range for a typical voltmeter IC is usually 200mV, with precision of 3? or 4? digits. A sigma-delta panel-meter IC from Maxim (MAX1499) is no exception, but you can easily double the range (to 400mV), and extend the precision to 4? digits (40000 counts).

Adjacent to the internal 20-bit ADC and 7-segment display driver, the MAX1499 includes an SPI interface that allows access to the ADC result, and also offers full control over the LED display. A microcontroller can easily use this interface to read the ADC result and control what is shown on the display.

View the PDF document for more information.

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