Opamp selection

Hi,

I am interested in an opamp with the following specs and I was wondering if anyone can help me with finding it here.

  • Dual supply operation (+/-3V)
  • Ultra low supply current (less than 100uA)
  • Low offset voltage
  • 4 circuits
  • Minimum slew rate: 2V/us
  • Comes in 16-LFCSP packaging

I am interested in using this opamp to build a current source which will supply a current up to +/-100uA across a maximum load resistance of 50kohm.

Thank you very much.

Parents
  • Hi chard,

    Thank you for finding these opamps for me.

    The reason I would like a fast opamp is because I am generating current pulses used for neuro-stimulation. I would like the pulses to have a risetime of <10us. If I draw a maximum of 100uA across a 30kohm resistor, then the opamp should have at least a slew rate of 0.3V/us to meet specs. Looking at the options you provided in your first paragraph, 0.25V/us is a good option if that is the best we can do.

    I also, would like a low current consumption opamp because the device is battery operated, so it must have a low supply current of <100uA.

    Best,

    Sara

Reply
  • Hi chard,

    Thank you for finding these opamps for me.

    The reason I would like a fast opamp is because I am generating current pulses used for neuro-stimulation. I would like the pulses to have a risetime of <10us. If I draw a maximum of 100uA across a 30kohm resistor, then the opamp should have at least a slew rate of 0.3V/us to meet specs. Looking at the options you provided in your first paragraph, 0.25V/us is a good option if that is the best we can do.

    I also, would like a low current consumption opamp because the device is battery operated, so it must have a low supply current of <100uA.

    Best,

    Sara

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