4-20mA to 0-3/3.3V conversion

pavan prasad

Other Parts Discussed in Thread: RCV420

I am implemention I -V conversion i.e from 4-20mA to 0-5 V , for this i used RCV420 . But with the same IC can I convert 4-20mA to either 0-3V or 0-3.3V.

Pl help in this regard.

yours

Pavan

over 12 years ago

0 Jayant Deshpande over 12 years ago

Expert 1495 points

Add a resistive divider at the RCV420 output.

Regards,

JayantD

0 John Caldwell over 12 years ago

TI__Genius 12325 points

Pavan,

The datasheet offers a method of using resistors in parallel with the input to reduce the gain of the circuit (see Figure 2). However, in your case, reducing the gain this much will cause relatively large offsets at low current levels. That being said I would agree with the above suggestion of adding a resistor divider and using an opamp in a unity-gain configuration to buffer the output signal.

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4-20mA to 0-3/3.3V conversion