EXCITATION CURRENT SOURCES for LTC2984

Question

Hi Team, 
 How many EXCITATION CURRENT SOURCES are there in LTC2984?

LoganC · Accepted Answer

Hi Sarumathi R , 
 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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EXCITATION CURRENT SOURCES for LTC2984