On 20 Dec 2006 10:52:03 -0000, Binu Pillai <binu_s_pillai@rediffmail.com> wrote:
>    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...?

AD420 looks like an interesting parts albeit a bit too expensive. Why do you
need a special output transistor?

You can always use another 16bit SPI DACs (with or without internal Vref)
and the associated current source circuit which is quite standard. Of course
you need an MCU with SPI to control it.

Regards,
Xiaofan
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