EXCITATION CURRENT SOURCES for LTC2984

Hi Team, 

How many EXCITATION CURRENT SOURCES are there in LTC2984?

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  • +1
    •  Analog Employees 
    on Oct 28, 2020 7:38 PM 1 month ago

    Hi ,

        There are multiple configurable current sources (current DACs) in the LTC2984 - however, typically only one is active at a time based on the channel configuration. 

        Cases where more than one current source is active:

    1) Thermocouple open-circuit detect uses a separate current source  from the one used by the cold-junction compensation sensor (Thermistor, RTD, or Diode) - those are active at the same time during the conversion.

    2) 3-wire RTDs use two matched current sources applied simultaneously to cancel the effect of the sensor lead resistance.

    Hope this helps, 

    -Logan

Reply
  • +1
    •  Analog Employees 
    on Oct 28, 2020 7:38 PM 1 month ago

    Hi ,

        There are multiple configurable current sources (current DACs) in the LTC2984 - however, typically only one is active at a time based on the channel configuration. 

        Cases where more than one current source is active:

    1) Thermocouple open-circuit detect uses a separate current source  from the one used by the cold-junction compensation sensor (Thermistor, RTD, or Diode) - those are active at the same time during the conversion.

    2) 3-wire RTDs use two matched current sources applied simultaneously to cancel the effect of the sensor lead resistance.

    Hope this helps, 

    -Logan

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