17 May
2010
17 May
'10
8:13 p.m.
On 17 May 2010 at 19:50, Mr Ian Primus wrote:
I have the need to optically isolate a composite video
signal to
compensate for the different ground reference between the devices.
Digging through my stash of parts, I have some optos, but the ones I
have are more suited to digital applications. Having not tried to pass
an analog signal through one before, I'm not quite sure what sort of
part I'm looking for...
Most garden-variety optos are hideously non-linear. You can use a
matched pair and use one to provide feedback to compensate for the
nonlinearity of the other, but you may not end up with enough
bandwidth.
I'm assuming that ADC->opto->DAC is out of the question.
Why not use a made-for-purpose part such as the HP/Agilent HCPL4562?
--Chuck