• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 47 subscribers
  • Views 3019 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Single supply op amp with 0 to +10V out

Steve Parus
Prodigy 50 points
Other Parts Discussed in Thread: OPA354, LM358, OPA171, OPA172, LT1013

Looking for a single supply op amp capable of 0 to 10V output.  Its output should get to within say 10 mV of ground when input is 0 V.  This would be for a load of say 10K.  The OPA354 has worked well for me but is only a 5V device.  The LM358/324 can get that close to ground but I am looking for a better quality op amp.

  • 0
    TI__Guru* 93105 points

    Hi Steve,

    Achieving an output swing close to the rail with a high-voltage op amp is tough. The geometries of the output transistors needed to withstand the higher supply voltage results in an drain-to-source resistance RDS(ON) that usually prevents the output from swinging as close to the rail as can be achieved with a low voltage device such as the OPA354.  In either case, low-voltage or high-voltage, using the lightest load possible increases the output swing range to its maximum value.

    About the best chance you have getting to about 10 mV of the rail with a high-voltage op amp and a 10 k-Ohm load is the OPA171. Take a look at Figure 9, Output Voltage Swing vs Output Current. You can find the datasheet here:

    Another amplifier to have a look at, the OPA172:

    I hope this helps.

    Regards, Thomas

    PA - Linear Applications Engineering

  • 0 in reply to Thomas Kuehl
    Prodigy 50 points

    Thanks Thomas.

    Would you be able to comment on the series of Linear Technology op amps that seem similar to each other.  Some will go closer to 0 V with a 600 ohm load vs no load.

    LT1006

    LT1077

    LT1078

    LT1211

    LT1213

    LT1215

    LT1013/1014

    LT1413

    Steve

  • 0 in reply to Steve Parus
    TI__Guru* 93105 points

    Hi Steve,

    Since LT is a direct competitor of TI it probably would not be appropriate for me to provide in-depth comments about their devices. What I will say is to take a look at the graphs labeled, "Output Saturation vs Sink Current vs Temperature" in their datasheets. I think you will be able to see how close each of their amplifier's output swings to 0 V. Rail-to-rail output behaviors are limited by the same factors across manufacturers.

    Regards, Thomas

    PA - Linear Applications Engineering