Does this comparator exist....
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 | | | Voice:(480)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. |
Does this comparator exist....
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 |
Does this comparator exist....
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 | | | Voice:(480)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. |
Does this comparator exist....
"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 |
Does this comparator exist....
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 | | | Voice:(480)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. |
Does this comparator exist....
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 |
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 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... |
Does this comparator exist....
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 | | | Voice:(480)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. |
Does this comparator exist....
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 | | | Voice:(480)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. |
Does this comparator exist....
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. |
Does this comparator exist....
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 |
Does this comparator exist....
"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 |
Does this comparator exist....
"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 |
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