Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

On 12/30/2012 4:08 PM, Jim Thompson wrote:
Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson

How about a TL431?

If you want something faster, there's the MCP65R41T.

Cheers

Phil Hobbs

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

160 North State Road #203
Briarcliff Manor NY 10510 USA
+1 845 480 2058

hobbs at electrooptical dot net
http://electrooptical.net

On Sun, 30 Dec 2012 16:23:50 -0500, Phil Hobbs
wrote:

On 12/30/2012 4:08 PM, Jim Thompson wrote:
Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson

How about a TL431?

If you want something faster, there's the MCP65R41T.

Cheers

Phil Hobbs

Nope. I would have to add stuff to make that work.

I need a comparator, with a couple of volts of common-mode range,
ideally with an adjustable difference between + and - inputs at the
switching point, but I can live with something fixed at between 300mV
and 500mV.

Seriously! A Joerg part ;-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

"Jim Thompson" wrote
in message ...
Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson
--

Can you do anything with this window comparator?
http://cds.linear.com/docs/Datasheet/1042fa.pdf

Cheers

On Sun, 30 Dec 2012 16:49:31 -0500, "Martin Riddle"
wrote:


"Jim Thompson" wrote
in message ...
Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson
--

Can you do anything with this window comparator?
http://cds.linear.com/docs/Datasheet/1042fa.pdf

Cheers


Right concept, but I need differential inputs, basically switch
when...

Vin1 Vin2 + delta

Both Vin1 and Vin2 can move

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

On Sun, 30 Dec 2012 14:08:29 -0700, Jim Thompson wrote:

Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson

Not a Joerg part, because if it did find one he'd complain about it being
"boutique".

--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson


Right concept, but I need differential inputs, basically switch
when...

Vin1 Vin2 + delta

Both Vin1 and Vin2 can move



RS485 receivers might do the trick... but no variable delta.... delta is
around 500mV.... ?
Maxim do a range...

On Sun, 30 Dec 2012 16:09:16 -0600, Tim Wescott
wrote:

On Sun, 30 Dec 2012 14:08:29 -0700, Jim Thompson wrote:

Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson

Not a Joerg part, because if it did find one he'd complain about it being
"boutique".

Sno-o-o-o-ort, ROTFLMAO :-}

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

On Sun, 30 Dec 2012 22:21:21 -0000, "TTman"
wrote:


Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson


Right concept, but I need differential inputs, basically switch
when...

Vin1 Vin2 + delta

Both Vin1 and Vin2 can move



RS485 receivers might do the trick... but no variable delta.... delta is
around 500mV.... ?
Maxim do a range...

Good idea. I'll check 'em out. Thanks!

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Tim Wescott wrote:

On Sun, 30 Dec 2012 14:08:29 -0700, Jim Thompson wrote:

? Does this comparator exist....
?
? Has the usual two inputs, inverting and non-inverting, BUT it switches
? when the DIFFERENCE between the two inputs is some reference value,
? either fixed/built-in, or adjustable by an extra pin?
?
? I know I could construct such a thing, but I'm looking for something
? small, minimum pins, etc., i.e. a Joerg part ;-)
?
? ...Jim Thompson

Not a Joerg part, because if it did find one he'd complain about it being
"boutique".


Yeah, but he considers a 555 a boutique part.

On Sun, 30 Dec 2012 16:23:50 -0500, Phil Hobbs
wrote:

On 12/30/2012 4:08 PM, Jim Thompson wrote:
Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson

How about a TL431?

If you want something faster, there's the MCP65R41T.

Cheers

Phil Hobbs

Lots of LVDS-to-CMOS receivers have some built-in offset, ca 100 mV. All the
ones that we've tested behave like good r-r comparators. Cheap and fast.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators

"Jim Thompson" wrote in message
...
Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson

I don't know of a part like that. The simplest solution I can think
of is a diode and resistor added to the front end of an ordinary
comparator(assuming your signals are not hi-Z).
Art

"Fred" wrote in message ...

"Jim Thompson" wrote in message
...
Does this comparator exist....

Has the usual two inputs, inverting and non-inverting, BUT it switches
when the DIFFERENCE between the two inputs is some reference value,
either fixed/built-in, or adjustable by an extra pin?

I know I could construct such a thing, but I'm looking for something
small, minimum pins, etc., i.e. a Joerg part ;-)

...Jim Thompson

I don't know of a part like that. The simplest solution I can think
of is a diode and resistor added to the front end of an ordinary
comparator(assuming your signals are not hi-Z).
Art
Damn. I wasn't paying attention and replied from a different account
and "Fred" probably isn't going to make it thru your filters.
This should.
Art