What is power consumption on AD8304?

When designing with the AD8304, how much power do I expect the VPS1 and VPS2 pins to draw? There is a quiescent current spec, but not an active current spec. Thanks.

  • 0
    •  Analog Employees 
    on Dec 21, 2011 9:44 PM

    The power consumption will heavily depend upon how much current the photodiode is creating, since the AD8304 provide the photodiode bias.  The photodiode bias driver is current limited to 20mA, but this is well outside the linear operating range of the log amp, which is specified to 10mA.  So assuming 10 mA is your input current limit, the total current should be 10mA + the quiescent current, which is 4.5mA, so max current during linear operation is 14.5 mA.  On a single 5V supply, the power would then be 72.5mW.

    Hope this helps,


  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:29 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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    EZ Admin