Hi,

Marcelo Y wrote:
>4-20mA transmitters:
>TI (formerly Burr-Brown) XTR110 chip.
>http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumber=3DXT=
R
110
>Analog Devices
>http://products.analog.com/products/info.asp?product=3DAD421
>as well Maxim look for MAX1452 IIRC.

Well for analog output we use MAX5122 and derative which fulfills our
needs :)
but I was asking for 20mA current loop transmitter/reciever circuit, it
different
as it is for transmitting only 2 levels of 'data' (on/off) and are used
for communications
over longer distances, quite common in the industry, well nowdays there
are more and more
RS422/485 but 20mA still have its share.
A 20mA curent loop can carry communication +1000 meters at fairly low
baudrates,
this in 'heavy' industries i.e. 10 V/m immunity etc.=20
It's pretty basic design wise, but selectable active/passive complicates
it somewhat, anyway
it was  a *long* time ago i dweeled into these circuits and thought
there could be
some new chips or similar that could simplify things for me ( i.e small
footprint, small
number of componets etc ).


/Tony

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