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RCV420: RCV420 4-20mA to 5-0V Conversion

Part Number: RCV420

I need to convert 4-20 mA to 0-5V.

I refer to the datasheet (FIGURE 12. 4-20mA to 5-0V Conversion)

I would like to ask about the connection of the circuit.
1.PIN3-floating?
2. Is PIN4-connected to ground or -VDD?
3. Can the PIN14 output be connected to a 20k resistor to ground?

  • Refer to Figure 10 and Figure 1 in the RCV420 datasheet for clarity of connections. Attached is an additional app note you might find useful.

    Let me know if things are still not clear.

    sbva004.pdf

    Tim Green, MGTS
    Senior Analog Applications Engineer
    
    		
  • In reply to Tim Green1:

    After refer to Figure 10 and Figure 1 ,So in Figure 12 PIN4-connected -VDD right?

    I still don't understand

    1.PIN3-floating in Figure 12 ?

    2.Can the PIN14 output be connected to a 20k resistor to ground? (Can I pump 0.25mA  from the OP ?)

  • In reply to John Lin41:

    Any suggestions?

  • In reply to Tim Green1:

    Refer to Figure 1 and Figure 12.
    Can both achieve the same purpose? Which one is your suggestion?
    thanks
  • In reply to John Lin41:

    Hi John,

    if you want to power the RCV420 with a single supply voltage, you might want to have a look into this application note:

    www.ti.com/.../sboa023

    Kai
  • In reply to John Lin41:

    From the datasheet, OUTPUT specification, for a +/-15V supply is 10V min, 12V typical for Io=+10mA, -5mA. So on your 12V and GND supplies you need to design for the datasheet specification of 5V to 7V. Not sure what you want but a difference amp and a good single supply op amp would be better if you want to get closer to 0V to 5V out for example. RCV420 is really intended for dual supply operation for a good ground referenced output swing.
    Tim Green, MGTS
    Senior Analog Applications Engineer
    
    		
  • In reply to Tim Green1:

    John

    We haven't heard back from you so we assume this answered your questions. If you need more help just post another reply below.

    Thanks
    Dennis

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