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Topic: Are A/D converters with +- voltage supplies always bipolar inputs? (Read 1 time) previous topic - next topic

liuzengqiang

Just a basic question: I want to find an A/D converter to sense +- voltage input (I guess it's bipolar). There are many of these A/D converters out there and I'm not sure which one to pick. To stick with the basic requirement of bipolar sensing, I wonder: If I see an A/D converter that requires +- 5V supplies, does that mean the A/D converter can sense +- 5V as well or not necessarily? Thanks!

CrossRoads

Keep it simpler - take your AC signal and AC couple it into a single-supply ADC.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Techone

@CrossRoads

Can you place a Zener diode of 5.1 V in your cicuit, parallel to analog in to gnd, cathode at analog pin for protection ? 

CrossRoads

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

liuzengqiang

Thanks CrossRoads. My signal is mostly DC. They have low frequency around 0.1-10Hz. BTW I'll be in Boston later today. Too busy with meeting :(

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