Electronics > Beginners

better way for adc multiplexing

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wraper:

--- Quote from: hsn93 on January 21, 2020, 09:37:35 am ---hi,

im trying to build industrial analog front end that can be configured by software to accept (4-20mA) or (0-10V / 1-5V / etc) on same connector pin

where accuracy doesnt matter that much

--- End quote ---
IMHO just connect 150R resistor with MOSFET for 4-20mA. For voltage ranges, simply use maximum range for everything and scale (ADC data) in software only. Or use different VREF voltage for different ranges for better accuracy. SSR makes little sense since ADC won't be isolated anyway.

wraper:
Oh, BTW even if you want full range of ADC for every voltage range, you don't need switches. Simply make several voltage dividers in parallel and connect them to separate ADC inputs. Again simply select in firmware which ADC input (divider) you want to use instead of switching anything.

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