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PGA305: About Power supply current(IPWR) of 3.3VPWR and 30VPWR at 4mA to 20mA mode

Hide
Guru 21045 points
Part Number: PGA305

Hi Team,

 

We would like to know Power supply current(IPWR)* of 3.3VPWR and 30VPWR at 4mA to 20mA mode.

*Consumption current of PGA305

-IPWR=??mA at VPWR=3.3V

-IPWR=??mA at VPWR=30V

 

Could you please let us know if you have any value?

(It is not necessary to guarantee this value.)

 

Regards,

Hide

  • 0
    Guru 21045 points

    Hi Team,

    What do you think about the present situation regarding this matter?

    I would appreciate your prompt reply.

    Regards,

    Hide

  • 0 in reply to Hide
    TI__Mastermind 31655 points

    Hello Hide,

    The typical application for 4-20mA mode is to use the PGA305 in a 2 wire configuration where the current loop both powers the device and supplies current for the output signal. In that case the loop current will be determined by the output of the PGA305. If the output DAC is set to the same value then the loop current will be identical whether the PGA305 is supplied with 3.3V or 30V.

    Regards,

  • 0 in reply to Scott Cummins
    Guru 21045 points

    Hi Scott-san,

     

    Thank you for the information.

    My understanding is as follows.

    Is my understanding correct?

     

    -IPWR=6.5mA at VPWR=3.3V, current loop is 4mA

    -IPWR=6.5mA at VPWR=30V, current loop is 4mA

    -IPWR=22.5mA at VPWR=3.3V, current loop is 20mA

    -IPWR=22.5mA at VPWR=30V, current loop is 20mA

    *IPWR is “current loop + 2.5mA(typ)”

     

     

    Regards,

    Hide

  • 0 in reply to Hide
    TI__Mastermind 31655 points

    Hello Hide,

    Since the current loop supplies the PGA305 in a 2 wire configuration (like the one in the applications section of the datasheet), the current loop current is the same as the IPWR. The 2.5mA typical operating current is included in the 4-20mA output.

    Regards,

  • 0 in reply to Scott Cummins
    Guru 21045 points

    Hi Scott-san,

     

    Thank you for always kind support.

    My understanding is as follows.

    -IPWR=2.5mA at VPWR=3.3V or 30V, current loop is no load

    -IPWR=4mA at VPWR=3.3V or 30V, current loop is 4mA

    -IPWR=20mA at VPWR=3.3V or 30V, current loop is 20mA

     

    Regards,

    Hide

  • 0 in reply to Hide
    TI__Mastermind 31655 points

    Hi Hide-san,

    Your understanding is correct.

    Regards,