[sdiy] early history of motorola 4-quadrant multipliers?
johnsen.rahbek at gmail.com
Thu Nov 6 00:47:21 CET 2014
that's just it -- if you look at the databooks, they seem to arrive all at once.
i neglected to mention that jim thompson told me that he designed the mc1545
in the summer of 1968 and that the device i'm restoring was made in 1969, so
that part of the chronology is pretty firm. he didn't have anything to
do with writing
the datasheet or app notes, though, as he also told me that it wasn't a
multiplier at all, but a mux.
On Wed, Nov 5, 2014 at 1:26 PM, Phillip Gallo <philgallo at gmail.com> wrote:
> I see the problem. The 1968 data book does not contain MC1545/1595/1596 and
> the 1969 data has all three, making them appear to be concurrent in release.
> Interestingly, the 1969 data book does not have a MC1496 while having the
> lower spec versions of the '45/'95.
> By 1972 you have MC1496 and the MC1494/1594.
> On Tue, Nov 4, 2014 at 3:02 PM, michael johnsen <johnsen.rahbek at gmail.com>
>> thanks for the replies so far. i understand well the differences between
>> motorola devices, actually. i'm mostly interested if someone can *verify*
>> a chronology of these devices, especially one that includes the
>> best from pittsburgh,
>> On Fri, Oct 31, 2014 at 2:46 PM, Donald Tillman <don at till.com> wrote:
>> >> On Oct 31, 2014, at 8:07 AM, michael johnsen <johnsen.rahbek at gmail.com>
>> >> wrote:
>> >> i’ve corresponded with mr thompson about the ic and was curious
>> >> about its place in the development of ic multipliers. he couldn’t
>> >> remember
>> >> the timeline well, but suggested that motorola part numbers were at
>> >> least
>> >> “intended” to be chronological, which would make the mc1545 older than
>> >> its well-known cousins, the mc1594, mc1595, and mc1596. can anyone
>> >> verify this or elaborate with other examples of earlier ic multipliers?
>> > Check out the SDIY discussion on balanced modulators back in August.
>> > I wrote:
>> > ----
>> > There were three in the series, the MC1494, MC1495, and MC1496. The
>> > 1496 is still in production and has always been the most popular for ring
>> > modulator circuits.
>> > The '94 was an analog multiplier.
>> > The '95 removed the differential current output circuit.
>> > The '96 was bare bones and required a little level shifting.
>> > ----
>> > I don't think this series was chronological, more like
>> > featureful-low-simpler-high. (Heh, like the Yamaha DX series.)
>> > The 15xx versions are most probably the same as the 14xx series, but
>> > came out better on testing. Since they were significantly more expensive,
>> > their quantity was lower, so the 14xx series is statistically more likely to
>> > be of the same spec as production improved over time.
>> > -- Don
>> > --
>> > Don Tillman
>> > Palo Alto, California
>> > don at till.com
>> > http://www.till.com
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