You could use a MAX5352... 12bit SPI DAC - data sheet gives an example
circuit for 0 to 20mA output using only 2 external parts. Be warned Maxim
has a reputation for long leadtimes.

-- Mark

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Binu Pillai
> Sent: Wednesday, December 20, 2006 5:52 AM
> To: Microcontroller discussion list - Public.
> Subject: [EE] 4-20mA transmitter
>
>
>  =A0
> Hello All
>    I am looking for 4-20mA transmitter, that takes serial inputs
> like SPI or I2c and give output from 4 to 20mA. I have tried
> using AD420 but one of the peripheral transistor was hard to
> source so i am thinking of switching to some other system...any
> suggestion...?
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>



-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist