4-20mA transmitters:
TI (formerly Burr-Brown) XTR110 chip.
http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumber=XTR110
Analog Devices
http://products.analog.com/products/info.asp?product=AD421
as well Maxim look for MAX1452 IIRC.

Marcelo Y.




>
>Hi,
>I have some designs for an 20mA current loop i/f that we use on some
>of our products, however these are designed for TTL i/f as they are
>internal.
>Now I need to make an external version, my questions are:
>Are there any designs available on the net ?
>Are there any 'driver chips' available ?
>
>
>I need to cater for both active and passive loops.
>
>Thanks in advance.
>
>/Tony
>
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