[sdiy] TL068 datasheet anyone?

[Roy J. Tellason]

On Tuesday 05 July 2005 06:24 pm, Magnus Danielson wrote:
> From: Nils Pipenbrinck <np at inverse-entertainment.de>
> Subject: [sdiy] TL068 datasheet anyone?
> Date: Tue, 05 Jul 2005 23:50:37 +0200
> Message-ID: <42CB00AD.4040605 at inverse-entertainment.de>
>
> > Hi list.
>
> Hi Nils,
>
> > I'm looking for the datasheet of the TL 068. It should be a 3 terminal
> > voltage follower in TO92. I've seen it mentioned in a book and now
> > scratch my head how the internal circuit looks like.
>
> OK. I have the datasheet, including the schematic of the interiour.
>
> The basic story is that there is a JFET diff-pair, one gate is towards the
> input pin, the other is towards the output/power pin. The diff-pair has a
> NPN current mirror (with emitter resistors) to VEE (ground). The follows a
> current amplifier stage, with a miller capacitor for frequency limitation,
> and which is dynamically loaded with a current mirror output. This then
> drives the output transistor. Both amplifier stages have current
> limitations in them. Besides that is an internal current reference with a
> multi-headed
> current-mirror towards the output/power rail. This feeds both the input
> stage as well as the first amplifier stage.
>
> Interesting little component. What if we had more of those! ;O)

It says there are 1000s of them here: http://www.allicmall.com/view.jsp

> Now, if that was enougth to satisfy you, then good. If you need the drug
> badly, I suppose I could have the two pages scanned later at night (I do
> prefer to stay focused on my GPIB hacking project though, very DIY-oriented
> I might add!).
>
> Cheers,
> Magnus