[sdiy] TL068 datasheet anyone?

[Magnus Danielson]

From: "Mike I." <mikei at marketbridge.ca>
Subject: Re: [sdiy] TL068 datasheet anyone?
Date: Fri, 8 Jul 2005 19:02:47 -0400
Message-ID: <000c01c58411$28dade30$15dd47d1 at d3b0d5>

Hi Mike!

> My old TI "Linear Control Circuits Databook" lists some neat stuff like the
> TL066 programmable BIFET op amp, the TL010 etc current mirror, the TL173
> linear Hall effect sensor, but no TL068.
> 
> My guess is that the TL068 could be a TL061 connected as a follower
> internally, or at least share some of the same circuitry.

It is very close. I compared the internal schemtics in my TI "Linear Circuits
Data Book" from 1984. Input circuit and current reference is basically the
same. First amplifier stage also, the output stage is naturally different. But
in the overall, they are basically just natural variation of the same circuit,
so they really belong to the same family, the TL06x.

> Other integrated followers (some of which are still in production), are the
> LM110/LM310   BUF-01   BUF634. These are commonly in minidip packages. Some
> of these have an offset of 30-100 mV and are best used in the feedback loop
> of an op amp. Another possibility is discrete followers made from a pair of
> selected FETs.

Like for instance we have in the Buchla 258 and Oberheim SEM VCOs.

Cheers,
Magnus