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Level Shifter Using MC33078

Dilbagh Singh
Intellectual 330 points
Other Parts Discussed in Thread: MC33078, MC1458, TINA-TI

I am trying to design a level shifter circuit from the dual opamp IC MC33078.
My aim is to transform a +/-5V signal into a 3.3V/0V signal.The simulation performed in TINA-TI with a similar IC i.e.MC1458 doesnt yield the required result.

I have attached the TINA-TI schematic file for reference. 

3414.Level Shifter.TSC

  • 0
    TI__Guru**** 164656 points

    Dibagh,

    You need to be sure the op-amp works with the supply voltage available and also works with the input common mode range and output range.

    Also you don't need an op-amp at all to convert +/-5V to 3.3V/0V signal. It takes three resistors and a accurate voltage source.
    Attached a an excel spread sheet that will generate a solution by specifying the gain, the output needed for 0V input, and the reference supply voltage. One of the three resistors must also be chosen because there is an infinite number of solutions otherwise. I preset the gain, mid range output, 3.3V refrence voltage and resistor A as 10k ohms.

    The image on the right shows where the resistors are located and has a plot for a +/-10V to 3.3V solution using a 2.5V reference.

    3 Resistor divider with DC offset.xls