Re: convert voltage to current

On Jun 1, 7:45 am, Donald wrote:
alireza_s85 wrote:
i need a ic that covert the voltage to current , capable
to be sink and source

This does not make sense !!

Please explain what you really need.

thanks

donald

He's talking about a transconductance amplifier, which has
a voltage input and current output. You can make discrete
circuits that do this, as Tony Williams and I have written
about here on s.e.d., but an transconductance IC would be
much easier. Burr-Brown offers OTA ICs, or operational
transconductance amplifiers. The opa660 was a favorite
of mine, because of its current programmability, but TI
has just replaced it with the opa860 and opa861 parts.
http://focus.ti.com/docs/prod/folders/print/opa860.html
http://focus.ti.com/docs/prod/folders/print/opa861.html

They have a raft of application notes, which are most
easily found by searching on opa660. I find that OPA
ICs can be very useful in making precision integrators,
ramps, log converters, gyrators, etc., but Burr-Brown's
app notes concentrate on making amplifiers, etc., which
to my mind is better done with ordinary opamps.

.