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'[EE]: 0-10volts to 4-20ma convertor'
2002\12\27@134142 by Jeethu Rao

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Hi,
A guy in here wants a couple of 0-10volts to 4-20ma convertors for
Interfacing some sensors to a PLC. Are there any directly
Applicable ICs for this or should I build it out of OPAMPS ?

The only IC I could find was MAX1459, which is for resistive sensors.
And its got a built in DAC for compensation etc. I'm looking for
Something simpler.

Thanks,

Jeethu Rao

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2002\12\27@160601 by Dwayne Reid

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At 12:20 AM 12/28/02 +0530, Jeethu Rao wrote:
>Hi,
>A guy in here wants a couple of 0-10volts to 4-20ma convertors for
>Interfacing some sensors to a PLC. Are there any directly
>Applicable ICs for this or should I build it out of OPAMPS ?

Have a look at the LM10 from National Semiconductor.  They have app notes
that show how do do this and the LM10 is ideally suited for the
purpose.  We use them by the thousands for both 4-20 mA and 1-5 mA sensor
transmitters.

dwayne

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2002\12\27@185300 by Rich

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Analog Devices has a very easy to use device.  Also there are some
commercial devices from Black Box, and similar companies.
{Original Message removed}

2002\12\27@195131 by Eric Chan

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Try using the Burr Brown XTR110 converter chip.  It costs about $10 each
and data sheets here:
http://www.sample.co.kr/burr-brown/xtr110.pdf

Good luck.

Eric
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Jeethu Rao wrote:

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2002\12\29@055926 by Chris Hunter

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Isn't the LM10 obsolete now?

Chris

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Sent: Friday, December 27, 2002 8:59 PM
Subject: Re: [EE]: 0-10volts to 4-20ma convertor


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2002\12\29@104145 by Olin Lathrop

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> Isn't the LM10 obsolete now?

It took me all of 27 seconds (yes I timed it) to answer that question, which
you could have done too.  See
http://www.national.com/pf/LM/LM10.html#Datasheet.


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2002\12\29@151247 by Chris Hunter

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I recall having serious problems obtaining these devices a couple of years
ago - it became so serious that I had to design them out of a number of
products!

Chris

{Original Message removed}

2002\12\30@100846 by Dwayne Reid

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At 08:12 PM 12/29/02 +0000, Chris Hunter wrote:
>I recall having serious problems obtaining these devices a couple of years
>ago - it became so serious that I had to design them out of a number of
>products!

We've been using several thousands per year for the past 5 years or so - I
don't recall the purchasing people complaining about availability.  I hope
it remains available indefinitely - it would be a serious pain to find a
replacement with that combination of features and price.

dwayne

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Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 18 years of Engineering Innovation (1984 - 2002)
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2002\12\31@143330 by Jeethu Rao

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Thanks for your inputs folks, I just went in for 3 ready made
Convertors. Saved a lot of time and Brain cycles this way.

Thanks,

Jeethu Rao

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