precision low cost isolation amplifier

Been going since 1988. The design finally gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near end-of-life. I didn't think TI did that.

it makes sense in that it the limited supply then goes to those who really really need it to fix some old gear, and not to someone who has alternatives

The alternative is a step from original price to priceless, you'd prefer that?

So, how much did these USED to cost ?

boB

I remember using a few, back in the day. Highly specialized, ceramic package, etc. Yes they were expensive, but super useful. I agree with keeping old products alive for the few who really need it.

Not Recommended for Your Wallet, either

sometimes there are some truly boggling statements made for a group with so many proponents of the free-market capitalism...like they are confused when the tenets of free-market capitalism mean they will have to pay more. and someone will become richer at their expense.

the old saw I'm reminded of is "Don't hate the player hate the game"

That's the argument against price gouging laws.

When suppliers cause us grief (like Maxim and lately NXP) we go somewhere else. THAT is how capitalism works.

Part EOL is a serious problem for people who build things long-term. Designs like PCs and phones and TVs have a lifetime of maybe one year, so the OEMs can buy 60 million ICs and move on.

The TI AMC1100 looks nice. SiLabs also has some isolation amps, like Si8920.

A shunt an an isolation amp looks like my best way to acquire the voltage and current of my 400 Hz AC source. They do need a dc/dc converter to power the isolated side.

OTOH, the automotive market demands a ten-year life and, amazingly, Maxim and NXP are major players.

If there are annual orders for tens of millions of parts, they'll keep the fabs running.

Well if it were so easy to find a second source for this particular part you wouldn't be griping about it.

My guess is they know "you" like it, and that it's not easy. :(

Try not to take it personal, they didn't do it because they hate you. "Business is business! And business must grow, regardless of crummies in tummies, you know."

If it's a wye threephase system, only one isolated converter, three iso amps for voltages, and three hall sensors for currents. It's unclear whether there's any need for shunts.

We plan to make three isolated phases that can be connected any way, usually wye.

We need to measure output voltage and current, wideband, because we want to synthesize the complex impedances of the sources. And report our own output. Maybe provide waveforms.

I'm thinking that a shunt and an isol amp would be better than a Hall. Halls are drifty and noisy.

Noise won't hurt a Z measurement much, and drift (in an AC environment) isn't usually a major problem either. But, every time I think I want a shunt, i don't like ANY of the possible values; too-big and too-small resistors are all that I can locate.