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Voltage Input - Voltage/Current Output Transmitter Design Reference

Bhautik Ramoliya98
Intellectual 290 points

Other Parts Discussed in Thread: TLV9302, OPA2990, TLV9052, TLV9102, TLV9062, TLV9002, DAC8760, XTR111, XTR300

Hello there.

   I hope you are doing well.

  I have one sensor which gives random output between 0.5v DC to 4.5v DC. And i want to convert that whole range to 0 to 1v DC. Kind of mapping of the 0.5-4.5v to 0-1v DC.

  If possible then i also want both output (Voltage 0-1v DC and Current (4-20ma).

 Can you please suggest or direct me towards the reference design available or suggest some good IC to look at first.


Thanks,
Bhautik

  • 0
    TI__Genius 15410 points

    Hi Bhautik,

    I recommend taking a look at our Op Amp Cookbook. There are a lot of helpful circuits in there to help achieve what you want to do. Specifically I recommend the "Non-inverting op amp with inverting positive reference voltage circuit" on page 146 of the document.

    For the voltage to current conversion circuits I recommend taking a look at  "Low-Side V-I Converter Reference Design, 0 to 5 V Input, 0 mA to 500 mA Output" and "High-Side V-I Converter, 0-2V to 0-100mA, 1% Full Scale Error".

    Some of our newest devices I would recommend taking a look at are the TLV9062, TLV9002, and TLV9052 for low voltage operation. And the OPA2990, TLV9302, and TLV9102 for high voltage operation. The High Side V-I converter circuit will require a Rail to Rail Input device, all the low voltage devices are Rail to Rail In but only the OPA2990 and TLV9102 of the high voltage product are Rail to Rail In

    Thank you,

    Tim Claycomb

  • 0 in reply to Tim Claycomb
    Intellectual 290 points
    Hello Tim, Thanks for the detailed answer. Links given by you are very interesting and helpful. For the voltage to current, i am looking for a 4-20ma current loop transmitter, so i was wondering if TI provides any IC which gives both output (Voltage and Current Loop). Basically my input is 0.5 to 4.5v DC voltage as a signal. (No limitation on power supply..i can provide from 5v to 24v DC) And in output side i want two output if possible. 1) Voltage :- 0 to 1V DC (i thinks by settting a resistor value we can map 0.5v as a 0v and 4.5v as a 1v) 2) 4-20ma Current Loop :- 4-20ma current (0.5v gives 4ma current and 4.5v signal will give a 20ma current). Regards , Bhautik
  • 0 in reply to Bhautik Ramoliya98
    TI__Genius 15410 points

    Hi Bhautik,

    Products like the XTR300 or XTR111 provide a voltage or current output. We also have some DAC products, such as the DAC8760, that can provide both a voltage output or current output.

    Are these the types of products you are looking for?

    Thank you,

    Tim Claycomb

  • 0 in reply to Tim Claycomb
    TI__Genius 15410 points

    Hi Bhautik,

    Are the XTR or DAC products what you were looking for?

    Thank you,

    Tim Claycomb