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Electronics => Beginners => Topic started by: fsky on August 29, 2015, 11:05:30 am

Title: Shift sensor output voltage up/down
Post by: fsky on August 29, 2015, 11:05:30 am

Hello!
I interfaced a sensor badly on my board and I have to fix it : (
I have an output voltage from a current sensor. It's output swing is as follows:

VCC/2 for no current,
VCC for full current.

How to shift those voltages to an differential ADC input, where I would like to get 0V for no current and 2,048V for full current? I want to discard anything below VCC/2.  VCC = 5V. I can source a couple hundred mA from output (it's op-amp buffered).
Any suggestions for doing it in a simple way and not loosing those important mV above VCC/2?

Is a solution using an op-amp as here on page 25:
http://www.microchip.com/stellent/groups/SiteComm_sg/documents/DeviceDoc/en542976.pdf (http://www.microchip.com/stellent/groups/SiteComm_sg/documents/DeviceDoc/en542976.pdf)
a good choice?

Title: Re: Shift sensor output voltage up/down
Post by: Simon on August 29, 2015, 11:57:02 am

yes something like that.