V-I converters

S

stzarov

New Member

• Jun 13, 2004

• #1

hi everybody..we are required to design a voltage to current converter which will give an output of 0-20mA for the input of 0-10 V.we also want it not change with different resistance,i.e we want the current not to change with changing load line..do you have any ideas ?

 

Sebi

Active Member

• Jun 13, 2004

• #2

AD694

 

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• ad694.gif

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S

stzarov

New Member

• Jun 13, 2004

• #3

it seems quite challenging,we can only use opamps and/or bjt's,could u simplify that design a little bit ???

 

Roff

Well-Known Member

• Jun 13, 2004

• #4

stzarov said:

hi everybody..we are required to design a voltage to current converter which will give an output of 0-20mA for the input of 0-10 V.we also want it not change with different resistance,i.e we want the current not to change with changing load line..do you have any ideas ?

Click to expand...

Do you mean 4-20ma output, which is a common scheme for transmitting analog data, and which is shown on the schematic Sebi posted?

 

Sebi

Active Member

• Jun 13, 2004

• #5

Why opamps and BJT-s if existiert all in one chip: AD694? The precise solution with discretes more complicated. The example is a crop from original datasheet and show the 4-20mA setup, but the chip can work also with 0-20mA output.
https://www.analog.com/UploadedFiles/Data_Sheets/390142776AD694_b.pdf

 

L

laroche73

New Member

• Jun 13, 2004

• #6

V-I converter

look at the following design note for some ideas, stzarov

**broken link removed**

 

S

stzarov

New Member

• Jun 13, 2004

• #7

thank you all guys,we could handle it with the data you supplied for us,thanks again !!!