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There has been a lot of fearmongering from the electronic music crowd for a long time about electronic music parts going out of production. Usually it’s just a case of some guys who are naturally kind’a jumpy. It’s an amplifier; and like an opamp it has a pair of differential inputs and a single output.
But the output is a current source instead of a voltage source. While opamps are almost always implementing some function by the use of a specific feedback network, the OTA is very often used open loop or partially open loop. OTA’s are perfect for a multitude of electronic music applications because they can control a parameter, such as amplifier gain or filter frequency, and control it very accurately over a range of at least three decades.
Or something like that; I was napping at the time. I want to suggest that these chips are too important to retire. The is clearly the most advanced and flexible. It features a very nice input diode linearization circuit, low noise, low offset voltage, and it comes in matched pairs. None of the other chips comes close in these areas, so if you can only support one OTA chip, that’s the one. The is also capable of functionally replacing any of the other OTA models, ignoring the obvious pin-compatibility issues.
The LM has been discontinued. There are many audio electronics applications for theand while admitedly most audio is digital now, the analog alternatives are where the high-end markets lie. The is invaluable in electronic music work. It’s the preferred chip for voltage controlled oscillators, voltage controlled filters, voltage controlled amplifiers, waveform shaping, modulation, signal processing, routing and control, chaos circuits, simulation of mechanical systems, and so forth.
And there is currently a resurgance in modular analog music synthesizers SynthTech, Synthesizers. Along those lines, the is inspirational for new designs.
And I have a significant number of additional applications in the pipeline. I predict that if the CA is not discontinued, sales will pick up as the supplies of the other OTA chips drop off and the choice of which OTA to use narrows, with the resurgance of audio and electronic music applications, and with new applications being developed.
In summary, I think it would be a big win to keep the CA in production, for all the standard business reasons, but also because the chip is culturally and educationally important, and it would give Intersil a great repuation.
I will pass on your concerns but please understand, these CA family of products were developed by RCA on a very old and obsolete fab process that is long since been discontinued and the fab plant was shut down and sold off. We have been living on wafer stock. Today the wafer stock has been depleted to the point we have to withdraw the product. We need to insure we have enough product remaining to support the life time buys that are now incoming.
So, we reluctantly must withdraw these CA parts as our stock is depleted and in good faith, notify our customer base in time for last time buys. The CA series parts are certainly old; I think most of them were introduced before the Nixon administration!!!
Do you know if another company like the one that purchased the old fab equipment is considering carrying on producction when the current stock depletes? Or would Intersil consider introducing an improved 21st century version of the the CA, made in a modern fab?
We are sorry but what FAB equiptment we did not move to Florida, we sold with the building. The CA process was based on an old 7 micron specialized process. So, the process is gone and is not worth the time and 10’s of millions to rebuild when today we are working with sub micron processes. The market size for the CA part just will not return a profit for the cost.
As for other sources, I would start with our obsolete distributor, Rochester Electronics. I don’t blame Intersil. The process used to make those chips is very old and has been handed down through a number of corporate buyouts. And I’m sure the CA hasn’t been their top seller. Also, this appears to affect the entire CA line which, besides the four OTA’s, includes transistor arrays, opamps, video amps, amps with unusual circuit configurations and taps, special purpose radio and television circuits, and so forth.
CA3094 / CA3094E DIP8
Datasbeet of these are somewhat antiquated designs and have few practical uses today. The transistor arrays are certainly nice, but given how easy it is to hand-match transistors, I don’t see an array of less-than-great transistors on a chip as an especially compelling story. But the OTA’s are a serious loss.
For one, there are a lot datasjeet CA’s still available, maybe hundreds of thousands, and that should meet demand for a while. Concerned electronic music folks could make “lifetime buys” and do fine. I have a number of projects and articles in the pipeline that use CA’s, and I’ll keep on course with those. Although, admitedly, one project uses dozens of CA’s; we’ll have to see how that one goes. Use the LM; it’s not as good, but it’s still in production and second sourced.
It might actually cz3094 for my dozens-of-OTA’s project. Try to get other foundries to manufacture OTA chips. OTA’s are general purpose devices, not specific to electronic music applications, so the demand should be enough to support at least one good one. OTA’s are not complex devices, although a substantial amount of hand matching of transistor will be required, but that’s not difficult.
Heck, the original Moog modulars were all discrete. This is also an opportunity to build a better discrete OTA. I might do that; it could have a lower noise input stage, built in exponential conversion for the programming current, a better linearization circuit, better current mirrors, that sort of thing. I’ll be happy to consult on such a project.
See their cross reference: Yeah, I know about that What I really want is a replacement for the high end CA I tried, too, to persuade Intersil to keep at least the CA, which I use often.
CA (INTERSIL) PDF技术资料下载 CA 供应信息 IC Datasheet 数据表 (1/14 页)
Note that you can achieve very respectable dynamic range with this part, and that it will operate on just a few volts and with very little current.
Too late; the plant somewhere in Ohio is gone, Intersil told me. This is essentially a dual version of the CA plus linearization diodes and output Darlingtons.
NJR wanted to know my annual usage of the ‘ Knowing full-well that anything less thanwould not interest them, I didn’t pursue my case. But NJR obviously has a fab line capable of this “archaic” linear process.
(PDF) CA3094 Datasheet download
So, my fellow datashheet enthusiasts, I suggest that you petition NJR for the ‘, ‘, and their like, if your quantity requirements are large enough to make it worth their while. Note that In desperate repair situations, some of the LM’s pins can be wired into a ‘ PCB pattern and provide identical results.
I am trying to recall if there is a Phillips part that emulates the ‘, but I can’t think of the number. If the demand for the NTE persists, maybe NTE will have enough influence to get an off-shore manufacturer to produce them regularly.
CA Datasheet(PDF) – Intersil Corporation
Perhaps NTE is ahead of the game, and indeed has a new source for these parts. NTE must know that Intersil ran out of CAs, though, because the price has gone up about three-fold since I bought them. I didn’t look yet. CA’ s for sale in batches of 50 on ebay, from Hong Kong just snatched up a bunch myself http: I have a question. I am designing a high order analog filter for the audio range.
It has an OTA and a buffer so seems perfect for filters. Would this be equivalent or better then AE for audio range? Of course I see that Texas Instruments is discontinuing it Is this a conspiracy. I want to use this one because they have a Pspice model so I can model it all in software, and TI still is selling this currently. By the way does anyone know if there are pspice models for CA or ??
NTE seems the best hope. It’s a very different internal design, with very different characteristics, and it is used in a different way. Not that the OPA isn’t an interesting chip Nah; more like a very weird chip that didn’t sell.
And then after acquiring buying Burr Brown, Texas Instruments has to figure out what to do with all that stuff they got. Somebody picking up the ? Let’s datwsheet the bar a little, shall we? It’s been thirty years, man; surely we can make some dztasheet.
The stupidity of the IC industry is that they neglect to understand that the VCA is one function that does not work well in digital. You can’t dynamically compress or expand in digital without generation of rounding noise They’re shooting themselves in the foot!
The US is the largest exporter of industrial controls – which use lots of linear ICs. Small and compact means unreliable and unserviceable. Caa3094 mount does not belong on an airplane or in a car!
Ok, enough ranting and raving. I have had a problem with this chip for almost 11 years. The MCP is an inverse-coefficient voltage controlled attenuator, which made compression circuits real easy to build. It was discontinued the year I designed the boards, and by the time I had made my first prototype built, I had to re-design again. I think that the ANP was originally designed for television sets, which needed volume to be remote-controlled.
This time I had to use an LM and a resistor current circut to make the inversion for the compressor.