Re: Driving ADC, please help

Hi Ramon,

The solution i described is a single supply solution. You use a 5V supply for Vs+ and connect the Vs- to ground. Because of the inverting config you have a resistor from the 10V to virtual ground on the opamp so the opamp itself does not see 10V.

Best Rgds,

Alan

Edit: Sorry Ramon, an important piece of info I left out is that you will need to bias the + input of the opamp at 2/3 of the output range or 3.33V in order to level shift the opamp output. This could be achieved with a 2:1 resistor divider from the 5V reference. In terms of stability see this RAQ

http://www.analog.com/static/imported-files/rarely_asked_questions/RAQ_attenuator.pdf

Message was edited by: Alan Walshe

Hi Ramon,

The solution i described is a single supply solution. You use a 5V supply for Vs+ and connect the Vs- to ground. Because of the inverting config you have a resistor from the 10V to virtual ground on the opamp so the opamp itself does not see 10V.

Best Rgds,

Alan

Edit: Sorry Ramon, an important piece of info I left out is that you will need to bias the + input of the opamp at 2/3 of the output range or 3.33V in order to level shift the opamp output. This could be achieved with a 2:1 resistor divider from the 5V reference. In terms of stability see this RAQ

http://www.analog.com/static/imported-files/rarely_asked_questions/RAQ_attenuator.pdf

Message was edited by: Alan Walshe