> On Fri, 7 May 1999, Harrison Cooper wrote:
>
>  sums it up.  Someplace I thought I had read/heard/seen a single chip that
>  would do this. Sure, do it with an opamp, but I want a KISS solution, single
>  part with all the resistors, etc on the internal etch, and guaranteed to
>  drive an industrial 4-20mA device.

Hi Harrison,

Check out the Analog Devices AD694 16-pin 4-20mA transmitter. It is a
single chip solution for input spans of 0-2V or 0-10V. However, other spans may
be programmed using the internal buffer amplifier and an external resistor. Can
also function with a minimum supply voltage of 4.5V. This would require scaling
the input to 0-2V, but again this can be done using an external resistor.

A very versatile chip I use in production - saves a lot of board space and
design headaches. Grab the AD694.PDF file off their web site for details.

Good luck,

John
Hohner Shaft Encoder Corp.
Ontario, Canada