XPost: sci.electronics.design, alt.binaries.schematics.electronic

Hello,
Where can I find your AD834 spice model today?

--
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XPost: sci.electronics.design

On 2025-04-15 08:30, FRAUBRJ wrote:> Hello,

Where can I find your AD834 spice model today?

<https://electrooptical.net/static/oldsite/www.analog-innovations.com/AD834_JT_SUBCKT.zip>

No warranties, expressed or implied.

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

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XPost: sci.electronics.design, alt.binaries.schematics.electronic

On 15/04/2025 10:30 pm, FRAUBRJ wrote:

Hello,
Where can I find your AD834 spice model today?

Jim Thompson died some years ago - or at least we are fairly sure he
did. He got pancreatic cancer, which is pretty reliably lethal, but
claimed that it had been detected early, before he stopped posting.

Somebody here may have a copy of his Spice model. I actually used the
part, but in a design that never actually made it to production, through
we did get a couple of prototypes working. The AD834 and AD835 were
remarkably fast, but not all that accurate. Analog Devices would be the
place to ask, and they took over LTSpice when they took over linear
technology.

They didn't manage to hang onto

https://en.wikipedia.org/wiki/Mike_Engelhardt

--
Bill Sloman, Sydney

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XPost: sci.electronics.design

On Tue, 15 Apr 2025 11:53:47 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2025-04-15 08:30, FRAUBRJ wrote:> Hello,

Where can I find your AD834 spice model today?

<https://electrooptical.net/static/oldsite/www.analog-innovations.com/AD834_JT_SUBCKT.zip>

No warranties, expressed or implied.

Cheers

Phil Hobbs

Unless one is really picky, a simple BV block can multiply.

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XPost: sci.electronics.design

john larkin <jl@glen--canyon.com> wrote:

On Tue, 15 Apr 2025 11:53:47 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2025-04-15 08:30, FRAUBRJ wrote:> Hello,

Where can I find your AD834 spice model today?

<https://electrooptical.net/static/oldsite/www.analog-innovations.com/AD834_JT_SUBCKT.zip>

No warranties, expressed or implied.

Unless one is really picky, a simple BV block can multiply.

Do they come in TSSOP?

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics

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XPost: sci.electronics.design

On Wed, 16 Apr 2025 02:23:52 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

john larkin <jl@glen--canyon.com> wrote:

On Tue, 15 Apr 2025 11:53:47 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2025-04-15 08:30, FRAUBRJ wrote:> Hello,

Where can I find your AD834 spice model today?

<https://electrooptical.net/static/oldsite/www.analog-innovations.com/AD834_JT_SUBCKT.zip>

No warranties, expressed or implied.

Unless one is really picky, a simple BV block can multiply.

Do they come in TSSOP?

Cheers

Phil Hobbs

The BV price is better.

https://www.digikey.com/en/products/detail/analog-devices-inc/AD834JRZ/621076

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XPost: sci.electronics.design

On Tue, 15 Apr 2025 21:00:51 -0700, john larkin <jl@glen--canyon.com>
wrote:

On Wed, 16 Apr 2025 02:23:52 -0000 (UTC), Phil Hobbs ><pcdhSpamMeSenseless@electrooptical.net> wrote:

john larkin <jl@glen--canyon.com> wrote:

On Tue, 15 Apr 2025 11:53:47 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2025-04-15 08:30, FRAUBRJ wrote:> Hello,

Where can I find your AD834 spice model today?

<https://electrooptical.net/static/oldsite/www.analog-innovations.com/AD834_JT_SUBCKT.zip>

No warranties, expressed or implied.

Unless one is really picky, a simple BV block can multiply.

Do they come in TSSOP?

Cheers

Phil Hobbs

The BV price is better.

https://www.digikey.com/en/products/detail/analog-devices-inc/AD834JRZ/621076

I wonder if many peope have a need for an expensive precision analog
multipier in real life.

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XPost: sci.electronics.design

On Wed, 16 Apr 2025 17:57:23 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2025-04-16 15:45, john larkin wrote:

On Tue, 15 Apr 2025 21:00:51 -0700, john larkin <jl@glen--canyon.com>
wrote:

On Wed, 16 Apr 2025 02:23:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

john larkin <jl@glen--canyon.com> wrote:

On Tue, 15 Apr 2025 11:53:47 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2025-04-15 08:30, FRAUBRJ wrote:> Hello,

Where can I find your AD834 spice model today?

<https://electrooptical.net/static/oldsite/www.analog-innovations.com/AD834_JT_SUBCKT.zip>

No warranties, expressed or implied.

Unless one is really picky, a simple BV block can multiply.

Do they come in TSSOP?

Cheers

Phil Hobbs

The BV price is better.

https://www.digikey.com/en/products/detail/analog-devices-inc/AD834JRZ/621076

I wonder if many peope have a need for an expensive precision analog
multipier in real life.

In test sets, probably. Otherwise no.

Cheers

Phil Hobbs
(Who last used one in about 1995)

Yeah, that sort of analog computing is a distant memory now.

Test sets? How?

We do still use some MDACs, but we'd go all digital in the future on
that product. A 1 Ms/s 14-bit ADC is $2.

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XPost: sci.electronics.design

On 2025-04-16 15:45, john larkin wrote:

On Tue, 15 Apr 2025 21:00:51 -0700, john larkin <jl@glen--canyon.com>
wrote:

On Wed, 16 Apr 2025 02:23:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

john larkin <jl@glen--canyon.com> wrote:

On Tue, 15 Apr 2025 11:53:47 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2025-04-15 08:30, FRAUBRJ wrote:> Hello,

Where can I find your AD834 spice model today?

<https://electrooptical.net/static/oldsite/www.analog-innovations.com/AD834_JT_SUBCKT.zip>

No warranties, expressed or implied.

Unless one is really picky, a simple BV block can multiply.

Do they come in TSSOP?

Cheers

Phil Hobbs

The BV price is better.

https://www.digikey.com/en/products/detail/analog-devices-inc/AD834JRZ/621076

I wonder if many peope have a need for an expensive precision analog multipier in real life.

In test sets, probably. Otherwise no.

Cheers

Phil Hobbs
(Who last used one in about 1995)

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

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XPost: sci.electronics.design

On 2025-04-16 18:14, john larkin wrote:

On Wed, 16 Apr 2025 17:57:23 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2025-04-16 15:45, john larkin wrote:

On Tue, 15 Apr 2025 21:00:51 -0700, john larkin <jl@glen--canyon.com>
wrote:

On Wed, 16 Apr 2025 02:23:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

john larkin <jl@glen--canyon.com> wrote:

On Tue, 15 Apr 2025 11:53:47 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2025-04-15 08:30, FRAUBRJ wrote:> Hello,

Where can I find your AD834 spice model today?

<https://electrooptical.net/static/oldsite/www.analog-innovations.com/AD834_JT_SUBCKT.zip>

No warranties, expressed or implied.

Unless one is really picky, a simple BV block can multiply.

Do they come in TSSOP?

Cheers

Phil Hobbs

The BV price is better.

https://www.digikey.com/en/products/detail/analog-devices-inc/AD834JRZ/621076

I wonder if many peope have a need for an expensive precision analog
multipier in real life.

In test sets, probably. Otherwise no.

Cheers

Phil Hobbs
(Who last used one in about 1995)

Yeah, that sort of analog computing is a distant memory now.

Test sets? How?

A simple test set that needs to compute the power dissipation in a
complicated situation, for instance.

Making a measurement ratiometric by dividing out the strength of the excitation.

Test sets sometimes need to do relatively complicated things like that.
If you're building one or ten, you'd probably far prefer to spend $50
and be done, rather than spend a week or two designing it like a product.

We do still use some MDACs, but we'd go all digital in the future on
that product. A 1 Ms/s 14-bit ADC is $2.

MDACs are pretty useful sometimes, because all-digital approaches are heavyweight.

For instance, in a control loop, you can get much better bandwidth with
a 10 MHz, 14-bit AD5446 MDAC than a 1 MSa/s ADC plus processing plus
some normal DAC. It's very common that the resolution required for the
loop gain is much less than you'd need for a fully digital solution, so
you just use an analog loop and tweak it digitally.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

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XPost: sci.electronics.design

Thanks

--
For full context, visit https://www.electrondepot.com/electrodesign/spice-model-for-adi-500mhz-four-quadrant-multiplier-added-to-750832-.htm

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