Hello

I haven't read the datasheet for the opamp you are using in detail but it is
billed as rail-to-rail input and output so you *should* be able to use it to
get the signal. I use the CA3260 in a similar situation and it is
satisfactory down to the milivolts.

Or an instrumentation amplifier such as AD620, AD629, INA110 should solve
your problem. A big hammer for a small nail though.

You may also try some of the Analog Devices AD converters with built in
amplifiers. AD7705 has two fully differential inputs with a digitally
programmable gain in the 1-128 range.

HTH.

On 5/5/07, Rolf <learr@rogers.com> wrote:
>
> Hi all, I have an EE problem that I would like help solving. I have a
> Li-Ion charging chip (LTC1733) that, as one of it's outputs, provides a
> voltage proportional to the charge current. In essence, in my
> application, it is a 1V/A ratio. It will put 1V on the output if it is
> charging @ 1A, and 10mV for 10mA charge, etc. The full-range output of
> the device is 1.5V indicating the maximum 1.5A charge current. This is
> practically a DC signal, there are no bandwidth concerns.
>
>
>
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist