[Pinchy]

Hello,

I am from Belgium (Europe) and have a problem in obtaining an analog
multiplier for a basic design. I have been digging up a few types
like AD532, AD534, AD633 or even MLT04 from Analog Devices

It seems to be pretty hard to find one of these. Multipliers have
become pretty expensive (about 20 Euro, about 24 Dollar) or should be
ordered in high volume (500 pieces). I only need 2 of them !!

Can anyone from the regio advise a simple common type (it shouldn't
even be 4 quadrant) that is still common in Europe ?

Thanks a lot

Eng. Geert DB
Belgium

 

[Winfield Hill]

Pinchy wrote...

I am from Belgium (Europe) and have a problem in obtaining an analog
multiplier for a basic design. I have been digging up a few types
like AD532, AD534, AD633 or even MLT04 from Analog Devices

It seems to be pretty hard to find one of these. Multipliers have
become pretty expensive (about 20 Euro, about 24 Dollar) or should
be ordered in high volume (500 pieces). I only need 2 of them !!

Can anyone from the regio advise a simple common type (it shouldn't
even be 4 quadrant) that is still common in Europe ?

I like the expensive AD734. The AD633 isn't too expensive. Sadly,
the cheaper ones have become toast, unless you buy hundreds or more.

 

[[email protected]]

Farnell list a bunch of Analogue Multipliers - their price for the
Analog Devices AD633JN is 13.60 euro (plus tax) for one to nine (and
they will sell just two).

They also list the New Japanese Radio Corporation NJM4200D for 7.52
euro in the same quantities - it isn't a multiplier that I've ever
used, but you might want to take a look at it.

 

[Tony Williams]

I am from Belgium (Europe) and have a problem in obtaining an
analog multiplier for a basic design. I have been digging up a
few types like AD532, AD534, AD633 or even MLT04 from Analog
Devices [snip]
Can anyone from the regio advise a simple common type (it
shouldn't even be 4 quadrant) that is still common in Europe ?

AD633JN is about the cheapest of the 4-quadrant
pre-trimmed multipliers. Very easy to use, few
external components normally required.

The 4200 is even cheaper, but only easy to use
when the input signals are restricted to being
positive only.

Operational Transconductance Amplifiers (LM13600)
are peanuts and can be made into multipliers, but
require development work and the results may not
be accurate enough.

For just 2 pieces the AD633JN probably represents
the best overall value for money.

 

[Winfield Hill]

[email protected] wrote...

Farnell list a bunch of Analogue Multipliers - their price for the
Analog Devices AD633JN is 13.60 euro (plus tax) for one to nine (and
they will sell just two).

They also list the New Japanese Radio Corporation NJM4200D for 7.52
euro in the same quantities - it isn't a multiplier that I've ever
used, but you might want to take a look at it.

That's their version of the old Raytheon RC4200, now made by Fairchild.
This two-quadrant multiplier has sinking current inputs and outputs.

 

[Tony Williams]

That's their version of the old Raytheon RC4200, now made by
Fairchild. This two-quadrant multiplier has sinking current
inputs and outputs.

Excellent for unipolar use, especially for XY/Z apps,
but a total swine when used with AC signals..... you
need a doctorate in precision resistor computation.
The cost of an output opamp also has to be factored-in.

 

[Tim Shoppa]

Operational Transconductance Amplifiers (LM13600)

Is the LM13600 an in-production part? I thought it had been obsoleted
by National, but maybe somebody else picked it up.

For just 2 pieces the AD633JN probably represents
the best overall value for money.

More expensive but similar is the Burr-Brown (now TI) MPY634.

If this is for audio/synth use (2-quadrant good enough) the
"electronically programmable potentiometers" are somewhat available and
useful for many things. Doing Google searches for "VCA" turns up a lot
of circuits used in analog synths, some based around jellybean
components. (Even though jellybeans like CA3046's have been
discontinued in the past few months, too!)

Tim.

 

[Pooh Bear]

Hello,

I am from Belgium (Europe) and have a problem in obtaining an analog
multiplier for a basic design. I have been digging up a few types
like AD532, AD534, AD633 or even MLT04 from Analog Devices

It seems to be pretty hard to find one of these. Multipliers have
become pretty expensive (about 20 Euro, about 24 Dollar) or should be
ordered in high volume (500 pieces). I only need 2 of them !!

Can anyone from the regio advise a simple common type (it shouldn't
even be 4 quadrant) that is still common in Europe ?

From relatively recent memory New Japan Radio Corporation - variously
known as JRC in Europe or NJR in the states introduced a 'consumer
quality' multiplier a few yrs back.

Sorry - don't have a part number. I was probably alerted to it by
profusion - the audio semi specialist distributor though.

http://www.profusionplc.com/product-frame.htm

I think it used the transconductance amp principle but wasn't as limited
as the 13600/700 though.


Graham

 

[Pooh Bear]

Farnell list a bunch of Analogue Multipliers - their price for the
Analog Devices AD633JN is 13.60 euro (plus tax) for one to nine (and
they will sell just two).

They also list the New Japanese Radio Corporation NJM4200D for 7.52
euro in the same quantities - it isn't a multiplier that I've ever
used, but you might want to take a look at it.

Curious. That may be the part I mentioned in another post to this
thread.

Anyway I can't find it on the Farnell site and it doesn't seem to be on
JRC/NJR's either.

Graham

 

[Pooh Bear]

Is the LM13600 an in-production part? I thought it had been obsoleted
by National, but maybe somebody else picked it up.


More expensive but similar is the Burr-Brown (now TI) MPY634.

If this is for audio/synth use (2-quadrant good enough) the
"electronically programmable potentiometers" are somewhat available and
useful for many things. Doing Google searches for "VCA" turns up a lot
of circuits used in analog synths, some based around jellybean
components. (Even though jellybeans like CA3046's have been
discontinued in the past few months, too!)

Talking of things being discontinued, I was astonished to see Philips
remove the NE5532/4 ( the classic high performance audio op-amp ) from its
current product line-up. Still available from TI & JRC though.


Graham

 

[martin griffith]

Tim Shoppa wrote:
Talking of things being discontinued, I was astonished to see Philips
remove the NE5532/4 ( the classic high performance audio op-amp ) from its
current product line-up. Still available from TI & JRC though.


Graham

I relabel 5534's toTDA1034 to give them that "pre CD" sound.

All in all, it is a stunning bit of silicon, there are better,
(AD797?), but what a price differential


martin

After the first death, there is no other.
(Dylan Thomas)

 

[Bob Eldred]

Hello,

I am from Belgium (Europe) and have a problem in obtaining an analog
multiplier for a basic design. I have been digging up a few types
like AD532, AD534, AD633 or even MLT04 from Analog Devices

It seems to be pretty hard to find one of these. Multipliers have
become pretty expensive (about 20 Euro, about 24 Dollar) or should be
ordered in high volume (500 pieces). I only need 2 of them !!

Can anyone from the regio advise a simple common type (it shouldn't
even be 4 quadrant) that is still common in Europe ?

Thanks a lot

Eng. Geert DB
Belgium

I'd consider using a different scheme, preferably one that uses common easy
to obtain components. One possibility is a pulse width, pulse height
multiplier. A simple one can be designed using a 555 in a pulse width
modulator mode to convert the first analog voltage to a constant frequency,
variable width signal on the output of the 555. This is clamped with a
second analog voltage to a precise pulse height in an op-amp. A second
op-amp connected as an integrator, integrates these pulses into an analog
voltage output that is the function of the product of the two inputs. This
scheme is relatively free of drift and temperature effects, has a good
dynamic range and can operate at a reasonable bandwidth depending on
oscillator frequency.

If these signals or their products are ever digitized, multiplication in the
digital domain or multiplication by a variable ADC reference are also
possibilities. I say, anything but an analog multiplier for cost and
availability reasons if nothing else.
Bob

 

[Pooh Bear]

I relabel 5534's toTDA1034 to give them that "pre CD" sound.

LOL ! I actually have some original TDA1034s somewhere in the metal can package
!

All in all, it is a stunning bit of silicon, there are better,
(AD797?), but what a price differential

Collosal. The 5532 is typically around 20-30 cents in quantity. I guess Philips
weren't making money from it anymore.

Graham

 

[Andy]

I am from Belgium (Europe) and have a problem in obtaining an
analog multiplier for a basic design. I have been digging up a
few types like AD532, AD534, AD633 or even MLT04 from Analog
Devices
[snip]

Can anyone from the regio advise a simple common type (it
shouldn't even be 4 quadrant) that is still common in Europe ?

AD633JN is about the cheapest of the 4-quadrant
pre-trimmed multipliers. Very easy to use, few
external components normally required.

The 4200 is even cheaper, but only easy to use
when the input signals are restricted to being
positive only.

Operational Transconductance Amplifiers (LM13600)
are peanuts and can be made into multipliers, but
require development work and the results may not
be accurate enough.

For just 2 pieces the AD633JN probably represents
the best overall value for money.

What about MC1495? Still available from some shops, even in Europe (ex.
fibra-brandt).

-- Andy

 

[Joerg]

Hello Pinchy,

It seems to be pretty hard to find one of these. Multipliers have
become pretty expensive (about 20 Euro, about 24 Dollar) or should be
ordered in high volume (500 pieces). I only need 2 of them !!

Can anyone from the regio advise a simple common type (it shouldn't
even be 4 quadrant) that is still common in Europe ?

If it doesn't have to be top notch precision look at the old workhorse
MC1496. It's under a Dollar single qty and around 30c high qty in the
US. Reichelt in Germany has it for 53 Eurocents. Don't know about
Belgium, there I usually concentrate more on the good stuff (Duvel,
Trappiste and so on...).

Groetjes, Joerg

 

[martin griffith]

Collosal. The 5532 is typically around 20-30 cents in quantity. I guess Philips
weren't making money from it anymore.

Graham

Wonder what they do with the old artwork/masks etc (limited
knowledge..)

sell them off?


martin

After the first death, there is no other.
(Dylan Thomas)

 

[Leon Heller]

Hello,

I am from Belgium (Europe) and have a problem in obtaining an analog
multiplier for a basic design. I have been digging up a few types
like AD532, AD534, AD633 or even MLT04 from Analog Devices

It seems to be pretty hard to find one of these. Multipliers have
become pretty expensive (about 20 Euro, about 24 Dollar) or should be
ordered in high volume (500 pieces). I only need 2 of them !!

Can anyone from the regio advise a simple common type (it shouldn't
even be 4 quadrant) that is still common in Europe ?

Why not use a DSP? Digitise both inputs, multiply them, and output via a
DAC?



Leon

 

[[email protected]]

Back in 1974 I worked on a pulse-width multiplier, built with LM301 op
amps and saturated transistor switches. It was extremely accurate -
about 0.1% - but as slow as a wet week.

A modern design with MOSFET switches (most likely CMOS) faster
integrators, and decent comparators could be quite a lot quicker and
equally precise. It wouldn't get anywhere near the MHz bandwidths you
get with a Gilbert cell analog multiplier, but for some applications
could be a cheap way to go, if you've got the board area available.

 

[Winfield Hill]

[email protected] wrote...

Back in 1974 I worked on a pulse-width multiplier, built with LM301
op amps and saturated transistor switches. It was extremely accurate -
about 0.1% - but as slow as a wet week.

Time for an ascii drawing, Bill.

A modern design with MOSFET switches (most likely CMOS) faster
integrators, and decent comparators could be quite a lot quicker and
equally precise. It wouldn't get anywhere near the MHz bandwidths you
get with a Gilbert cell analog multiplier, but for some applications
could be a cheap way to go, if you've got the board area available.

Or two.

 

[Joel Kolstad]

Why not use a DSP? Digitise both inputs, multiply them, and output via a
DAC?

Nowhere near the dynamic range? Massive overkill?

I know, I know, flashing an LED requires a PIC these days, if not an ARM
CPU...