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.

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  • Hi sahard

    Checking on Analog Devices’ portfolio you could look at ADA4096-4. ADA4096-4 meets most of your requirement, it is capable of +/-3V dual supply operation with a supply current of 65uA per amplifier. Its offset voltage is also relatively small with a typical value of 35uV. Your requirement of 4 circuits, which I think you refer to as 4 amplifiers in package, is also met by ADA4096-4 along with the package requirement of 16-LFCSP. It does not reach your requirement, though, of 2V/us Slew Rate, it can only provide up to 0.25 V/us Slew Rate.

    Often there is a tradeoff between slew rate and current. For faster devices, you would expect the part to draw more current. Why do you require a high slew rate? What will the current source be driving? If you really need a high slew rate in your application, you could also check AD8643 which reaches your Slew Rate requirement of 2V/us, its offset voltage is 50uV but the supply current is much higher at 195uA per amplifier. Could you provide more details about your application? With more information, I could provide a better part for you.


    Thanks


    Chard

Reply
  • Hi sahard

    Checking on Analog Devices’ portfolio you could look at ADA4096-4. ADA4096-4 meets most of your requirement, it is capable of +/-3V dual supply operation with a supply current of 65uA per amplifier. Its offset voltage is also relatively small with a typical value of 35uV. Your requirement of 4 circuits, which I think you refer to as 4 amplifiers in package, is also met by ADA4096-4 along with the package requirement of 16-LFCSP. It does not reach your requirement, though, of 2V/us Slew Rate, it can only provide up to 0.25 V/us Slew Rate.

    Often there is a tradeoff between slew rate and current. For faster devices, you would expect the part to draw more current. Why do you require a high slew rate? What will the current source be driving? If you really need a high slew rate in your application, you could also check AD8643 which reaches your Slew Rate requirement of 2V/us, its offset voltage is 50uV but the supply current is much higher at 195uA per amplifier. Could you provide more details about your application? With more information, I could provide a better part for you.


    Thanks


    Chard

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