4-20mA to 0-2.5 VDC converter IC

Hi all,
I want to sense a sensor which will give 4-20 mA output and send it to PIC controller ADC with reference voltage 2.5 VDC. SO anybody can tel me which IC can I use to convert 4-20 mA current to 0-2.5 V DC voltage in minimum cost and minimum space.

Hi,
There are many signal condtioner device available in the market.Probably if you approach the maxim ,TI or allegro you will get the good part.

Regards,
Arumugam

You can just use a 125 ohm resistor to get 0.5 to 2.5V signal.

Should use a resistor to drop it to 3 volts and then use an opamp stage to adjust the DC bias to 0-2.5

Sceadwian said:

Should use a resistor to drop it to 3 volts and then use an opamp stage to adjust the DC bias to 0-2.5

Click to expand...

Agree completely with this approach

sonalip said:

Hi all,
I want to sense a sensor which will give 4-20 mA output and send it to PIC controller ADC with reference voltage 2.5 VDC. SO anybody can tel me which IC can I use to convert 4-20 mA current to 0-2.5 V DC voltage in minimum cost and minimum space.

Click to expand...

"Transresistance, infrequently referred to as mutual resistance, is the dual of transconductance. It is a contraction of "transfer resistance". It refers to the ratio between a change of the voltage at two output points and a related change of current through two input points, and is notated as rm:
Rm = ΔVout/ΔIin
The SI unit for transresistance is simply the ohm, as in resistance."

200 Ω with 4-20 mA gives you 4v full scale and 0.8v min. Use a level shifter to remove the 0.8v (a signal diode), then an attenuator to get 2.5v full scale.

thanx all . i wl try