ca Transconductance Amplifiers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for ca Transconductance. The CA and CAA are similar in generic form to conventional operational amplifiers, but differ sufficiently to justify an explanation of their unique. The CA and CAA types are Gatable-Gain Blocks which utilize the unique operational-transconductance-amplifier. (OTA) concept described in.
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Thanks for passing my comments on. Ok, enough ranting and raving.
While opamps are almost always implementing some function by the use of a specific feedback network, the OTA is very often cx3080 open loop or partially open loop. 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. If the demand for the NTE persists, maybe NTE will have enough influence to get an off-shore manufacturer to produce them regularly.
It’s a very different internal design, with very different characteristics, and it is used in a different way. As for other sources, I would start with our obsolete distributor, Rochester Electronics.
So here’s my recent email conversation with Intersil ac3080 on the matter: 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.
Ca300, 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.
Use the LM; it’s not as good, but it’s still in production and second sourced. CA’ s for sale in batches of 50 on ebay, from Hong Kong just snatched up a bunch myself http: The process used to make those chips is very old and has been handed down through a number of corporate buyouts.
Don Tillman at November 10, It has an OTA and a buffer so seems perfect for filters. Post a comment Thanks for signing in.
Rochester – CA3080AE IC – Reissued OTA Chip
I am designing a high order analog filter for the audio range. 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. I almost went to using the CA, but had problems with its manufacturer, Harris, who was a “competitor” in the broadcast industry at the time.
In summary, I think it would be a big win to keep the CA xa3080 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.
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? We are sorry but what FAB equiptment we did not move to Florida, we sold with the building. Although, admitedly, one project uses dozens of CA’s; we’ll have to see how that one goes. The LM has been discontinued. Note that In desperate repair situations, some of the LM’s pins can be wired into a ‘ PCB pattern and provide identical results.
Do you know of any date codes to avoid with the Harris or Intersil parts? Let’s raise the bar a little, shall we?
Don’s Blog: Last of the OTA’s
Thanks for signing in. Art Harrison at September 23, 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. Eventually, I figured out how to make a cancelation circuit, and my VCA is now in the testing stages. The is also capable of functionally replacing any of the other OTA models, ignoring ca308 obvious pin-compatibility issues.
You can’t dynamically compress or expand in digital without generation of rounding noise Surface mount does not belong on an airplane or in a car!
There are not many alternatives available from other manufacturers. The US is the largest exporter of industrial controls – which use ca30080 of linear ICs.