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Original question:

LM324: LM324 high level output

LM324: LM324 high level output

Jean Piere Saavedra Villalta
Prodigy 10 points
Part Number: LM324
Other Parts Discussed in Thread: TLV9002

I've been working for my thysis in LM324 OA so I need to know how will be the ouput voltage swing for a single power supply of +5V to ground,  in the datasheet say that it decrease in 1.5v for a RL = 2K , But in my circuit I am using a RL = 200 ohms ,the output voltage VOH will be the same?.... becouse I need  Vo = 4.096 for my ADC Internal 

  • 0
    TI__Mastermind 30600 points
    Hi Jean Piere,

    You'll want to look at Figures 1 and 2 for output sourcing and sinking which will define your VOH and VOL. With a 200 Ohm load and output voltage of 4.096V, you'll be needing about 20mA from the output of the op-amp, so my reading shows that you'll only be able to get to about 3V (2V away from supply).

    I recommend taking a look at our TI precision labs videos, section 3, that discuss this topic further: training.ti.com/ti-precision-labs-op-amps

    To get around this problem, you'll need to choose a rail to rail output device like the TLV9002 or increase your supply voltage.

    Best,
    Paul
  • 0
    TI__Guru*** 140136 points

    Jean Piere,

    The data sheet tables for Io Output Current (sourcing) have a -10mA minimum spec for full temperature range.

    Therefore 200 ohms might not always work well. 10mA*200 ohms = 2V; possible output