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How to unleash the outputs of operational amplifiers are connected to a common load?

vlad-M7
on May 13, 2015

Used operational amplifiers AD8534 and AD8532.

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    •  Analog Employees 
    on May 18, 2015 9:42 PM

    Hi Vladimir,

    I just want verify your question. You want to disconnect the output of one of the op amp once it is not active? I'm seeing you have AD8534 for one of the DAC and AD8532 for the other DAC where these op amp outputs are connected to one load. If that is the case, I want to recommend a mux to control the output of your op amp by selecting one op amp at a time. You can check our Multiplexers here:http://www.analog.com/en/products/switches-multiplexers.html You should consider your bandwidth, voltage range requirements as well as the number of channels you needed. I also want to introduce family of op amps with disable functionality. This will eliminate the use of  mux to select the op amp you want active and not. This article (Amplifier Disable Function Eliminates Need for Multiplexers in Multichannel Applications ) will be a nice read to start with. You can start with these amplifiers with disable function: ADA4895-1, ADA4897-1 or AD8041.

    Please let us know if it answers your concern or you have any follow up questions.

    Regards,

    Phil

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  • 0
    •  Analog Employees 
    on May 18, 2015 9:42 PM

    Hi Vladimir,

    I just want verify your question. You want to disconnect the output of one of the op amp once it is not active? I'm seeing you have AD8534 for one of the DAC and AD8532 for the other DAC where these op amp outputs are connected to one load. If that is the case, I want to recommend a mux to control the output of your op amp by selecting one op amp at a time. You can check our Multiplexers here:http://www.analog.com/en/products/switches-multiplexers.html You should consider your bandwidth, voltage range requirements as well as the number of channels you needed. I also want to introduce family of op amps with disable functionality. This will eliminate the use of  mux to select the op amp you want active and not. This article (Amplifier Disable Function Eliminates Need for Multiplexers in Multichannel Applications ) will be a nice read to start with. You can start with these amplifiers with disable function: ADA4895-1, ADA4897-1 or AD8041.

    Please let us know if it answers your concern or you have any follow up questions.

    Regards,

    Phil

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