Level shift for ADC input

Status
Not open for further replies.
E

elsalty

Newbie level 5
Joined
Apr 9, 2009
Messages
8
Helped
0
Reputation
0
Reaction score
1
Trophy points
1,281
Activity points
1,355
op amp level shift

I have a signal that is 0-4V and an ADC with 0-3V input. I was thinking I could have an inverting gain stage of -0.75 followed by another gain stage of -1. Or I could just use a resistor divider to divide the voltage down to 75% of its original value and then a buffer amp with +1 gain. Is there a simpler way to do this without using an opamp?
 

Is there a simpler way to do this without using an opamp?
Click to expand...
E.g. a divider without a buffer. But it isn't a meaningful question without mentioning a particular ADC and additional requirements as input impedance.
 

    E

    elsalty

    Points: 2
    Helpful Answer Positive Rating
The ADC is a high impedance input and the circuit with the 0-4V output can drive moderate loads ~4-5k.
 

Yes, a resistive divider is just fine in that case.

JD
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…