looking for class D amplifier

Hi, i'm looking for a class D amplifier with these specifications:

  1. mono
  2. max3W
  3. gain regulation (varying input pin's logical value and not input resistor) Can you help me? Thanks in advance
Reply to
Bullwinkle
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LM48511 from National.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant

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Reply to
Vladimir Vassilevsky

Something like the MAX9768 ?

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Reply to
Jamie

Which then goes unobtanium on you ... ;-)

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Joerg

I prefer to design in parts from manufacturers where it's less likely that things vaporize :-)

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Joerg

Well, that's the way the market goes which is why you buy extra's for your customers.

Reply to
Jamie

Or you don't design in Maxim parts from the get-go.

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Reply to
Tim Wescott

If you stock the extras yourself, it quickly becomes a nightmare: x clients * y widgets * z unobtanium part numbers * a spares

If the client stocks the extras: You: "Mr. Client, you need to stock 140 of part# 1234" Client: "Why?" You: "Because they might become unobtanium and have no second source." Client: "Why the (&$*# did you design with those parts?" You: "Ah, er, humana humana ..."

I'm in a situation right now of unobtanium parts. Not pretty for the client. Their engineer left under a cloud (unspecified, and I did not ask, I'm doing the work as a favor to a contractor hired by the client.)

Ed

Reply to
ehsjr

All I can say with the exception of one chip that developed issues over time due to process shifts, all my stuff shipped routinely. Even the problem chip (which was a big ass problem since it was in some aircraft) eventually got fixed.

A cog in the system at Maxim recently retired. Supply should improve. Still a few more executives need to be shown the door though, but in the last two years some real stinkers have left.

As I've said here plenty of times, the best thing that could ever happen to Maxim is a company that knows what they are doing (say TI), buys the company and dumps the management. Nothing wrong with the products and engineers, but the clowns at the top are another story.

There is a stock market group somewhere on Yahoo that has lots of insiders posting. They don't all claim to be insiders, but from what I read and what I know, they are the real thing.

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Reply to
miso

Got some examples? Not the problem chip, don't reveal any internal issues.

Sorry, but before that happens I won't design in Maxim parts.

That is the sad part of this endless saga. Great engineering, miserable production planning. Similar in Europe. They don't screw up production so badly but their sales forces often seem quite incompetent.

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Those boards should be newsgroup style, they are hard to read because you need the back button all the time.

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Reply to
Joerg

r

You have to be kidding. Those 7219s are in lottery machines as well as gaming, certainly not manufacturers using friends and families to get parts. I can't release sales numbers, even if they are old, but they vastly exceed your purchase quantities (well, the quantities of your end user).

You probably know what you are doing, but there are tons are crappy SMPS waiting to fail. Hey, I own a few of the junkers. (Netgear. Save the world from their junky supplies.) I good thing wall warts, even switchers, are easy to buy at surplus shops.

Reply to
miso

Well I wasn't interested then!

There's something very *wrong* about a 7-bit output port. Why is that last transistor so expensive? :)

Yeah, pity.

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John Devereux
Reply to
John Devereux

I believe there are second sources, which is the point where certain manufacturer's parts start to look interesting.

Best regards, Spehro Pefhany

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Reply to
Spehro Pefhany

[...]

There's AS1100 - it's quite a bit cheaper for me, or maybe it's just that Maxim don't seem to have any distributors that can do decent pricing.

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John Devereux
Reply to
John Devereux

[...]

I have no idea, probably pin count. These things are meant for data but to drive relays and such.

Which is weird because pretty much everything else in power electronics went to FETs. Maybe die size? I guess Jim could elucidate us here.

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Reply to
Joerg

[...]

[...]

Remember when John Larkin became quite desperate and asked us here for samples? He certainly is a serious businessman. _That_ should have been a major wake-up call especially since Rebecca from Maxim participated in the thread (which was very courageous of her). In our med company we would have been summoned to the CEO office, prontissimo, the door would have been shut and it would have gotten very loud in there.

Did things get better after that thread? Obviously not since I have designed out Maxim parts in roughly a dozen cases after this incidence. Sorry, but that is as unacceptable to me as it gets. But it does generate a little revenue because design-outs aren't free 8-D

Well, how many hundred thousand lottery machines are there per state?

:-)

Gaming is a totally different ball game. A casino may have 2500 slots. Not exactly the stuff where cost is super-critical. Main issue with those is to make them vandal-proof, beer-spill tolerant, tamper-resistant, and so on.

All I can tell you is that the (few) failures for mine fall into categories like this: Fell into the pool, door slammed into it, li'l Leroy did batting practice, Brutus the pitbull got a hold of it, etc.

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Reply to
Joerg

e
.

Er, I called the right people to make Maxim get in that thread. I still have contacts, so I always have to watch what I write. [One reason I read the yahoo group on Maxim but stay the hell out of it due to the nature of the writing there. Trust me, those guys that claim to be insiders are insiders.]

Your have to look at Maxim/Micrel/LTC as hardware stores. They make a lot of stuff, all over the map. [Hardware store supply ranges from nuts and bolts to power tools.] That takes good operations people. Given recent retirements, things at Maxim can only get better. Some of what I call the 2nd tier founders are really sharp, far superior to the people they are replacing. Most of the original founders sort of got sucked into their jobs. Some good, and some not so good.

Both Dilbert and the Peter Principle are reality. The other issue is lack of stock incentive. When piles of money were being made on the stock, you worked around the clowns that were in your way. Easily 20% of the employees at the time were useless since JGH like to promote ass kissers, plus he filled the non-technical ranks with jocks that couldn't make it in pro-sports. [Most were idiots, a few were really sharp.] With poor stock performance, nobody will rock the boat to get the job done. But if good people occupy the spots of the cogs, the wheels will turn.

Reply to
miso

That was good that you called them in. I just wish they'd learned.

God operations folks? At Maxim? Where?

LTC, in contrast, has never ever let me or my clients down. Before they discontinue a chip it must have been zero-order for years, and then they still ask around if anyone could possibly ever want it. I use lots of their stuff, switchers and so on. IMHO Maxim and LTC are in no way comparable.

Well, I've heard that too often. Things get better, things get better, and then they didn't. I don't believe it until I see it. The litmus test is this: Key a category, any category into Digikey. Opamps, whatever. Then select Maxim only. Note the number of hits. Now add "in stock" and watch the hit number shrivel. To me, only the facts count.

That's the kind of job I love, come in when it's the pits and the stock is low, then be partially paid in stock options. But only if I get to take the steering wheel and free reign when it comes to changing the modus operandi.

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Reply to
Joerg

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Digikey is a funny thing. I suspect some companies to get exposure cut Digikey a price break. Note how some pages of Digikey look like adverts. Well, that is because they ARE effectively adverts Now Digikey is a two sided sword. Every company designing chips uses Digikey as the bible. If you can't get the external components from Digikey, you think really carefully about the product. No company expects the final system to be built out of components from Digikey, but the semis want to make sure prototypes can be produced. If external components are difficult to find, that is when you make a demo board.

Maxim only orphaned products when the process was lost, As far as I know, only bipolar products got orphaned. (I was partial to a high side current sense chip that Maxim had to stop making.) LTC always had a fab, so they didn't have such an issue.

Reply to
miso

[...]

Digikey is currently _the_ place to offer your components. No stock there often means it ain't going to be designed in.

Whoops, now we have identified problem #2 with that company. I think there is a lot of potential for improvement. The former BB must have had such issues when transferring to TI. In my case that has cost them dearly in design-ins. For those cases it's too late, after an ECO is signed off it takes an earth-shattering event to change it again.

With Maxim the main problem isn't orphaning, it's the timely availability of wide swaths of the product range in production quantities that just ain't there. IOW what is called vaporware among engineers.

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Joerg

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