Using CN0395 hardware (EVAL-CN0395-ARDZ), is there a way to easily change the ADN8810 FS current, and control it's output?

Using EVAL-CN0395-ARDZ with ADICUP platform. We are just interested in the ADN8810 portion of the board, as a current source, and would like to control the current output.

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  • 0
    •  Analog Employees 
    on Jul 26, 2018 10:03 AM

    Hi Reemo,

    The ADN8810 is a 12-bit High Output Current source in which the output current is set by the below equation:

    2f71b9506ce0d3ef470579daf13cc56d.html

    The full scale current is dependent on the value of the sense resistors,  R17_SPACER and R19_SPACER, which uses the following equation:

    2867.2f71b9506ce0d3ef470579daf13cc56d.html

    where in the CN0395 circuit:

    VREF is the voltage reference of the circuit (4.096 V) and RSN is the value of the sense resistors (41.2 Ω). ADN8810 is designed to operate with a 4.096V reference voltage while the sense resistors are variable which can be set to get full scale current output of 300mA. It is best to select precision resistors when choosing values for RSN to have an accurate output voltages.

    With a 4.096 voltage reference and a 41.2Ω sense resistor, the full scale output is set to 9.94mA with a 2.42uA LSB on a 12-bit resolution.

    Hope this helps.

    Regards,

    Glenn Amparo

Reply
  • 0
    •  Analog Employees 
    on Jul 26, 2018 10:03 AM

    Hi Reemo,

    The ADN8810 is a 12-bit High Output Current source in which the output current is set by the below equation:

    2f71b9506ce0d3ef470579daf13cc56d.html

    The full scale current is dependent on the value of the sense resistors,  R17_SPACER and R19_SPACER, which uses the following equation:

    2867.2f71b9506ce0d3ef470579daf13cc56d.html

    where in the CN0395 circuit:

    VREF is the voltage reference of the circuit (4.096 V) and RSN is the value of the sense resistors (41.2 Ω). ADN8810 is designed to operate with a 4.096V reference voltage while the sense resistors are variable which can be set to get full scale current output of 300mA. It is best to select precision resistors when choosing values for RSN to have an accurate output voltages.

    With a 4.096 voltage reference and a 41.2Ω sense resistor, the full scale output is set to 9.94mA with a 2.42uA LSB on a 12-bit resolution.

    Hope this helps.

    Regards,

    Glenn Amparo

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