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'[EE] optocoupler'
2009\05\13@193100 by Wouter van Ooijen

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I am looking for an optocoupler that can handle serial asynch (1MHz is
fine) and can operate at 2.5 .. 5.5 V supplies. Must of course be cheap
and widely available ;)

Any suggestions?

--

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu

2009\05\13@193940 by Xiaofan Chen

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On Thu, May 14, 2009 at 7:30 AM, Wouter van Ooijen <spam_OUTwouterTakeThisOuTspamvoti.nl> wrote:
> I am looking for an optocoupler that can handle serial asynch (1MHz is
> fine) and can operate at 2.5 .. 5.5 V supplies. Must of course be cheap
> and widely available ;)
>

Many Optocouplers from Avago will do. They are not
expensive and widely available.
http://www.avagotech.com/pages/en/optocouplers_plastic/plastic_3.3v_digital_optocoupler/



--
Xiaofan http://mcuee.blogspot.com

2009\05\13@194652 by William \Chops\ Westfield

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On May 13, 2009, at 4:30 PM, Wouter van Ooijen wrote:

> I am looking for an optocoupler that can handle serial asynch (1MHz is
> fine) and can operate at 2.5 .. 5.5 V supplies. Must of course be  
> cheap
> and widely available ;)

the 6N138 and/or 6n137 are widely used in MIDI current-loop to logic  
translators (which is serial async at 31250bps...)  You can probably  
look up other MIDI circuits for other suitable part numbers...

BillW

2009\05\13@231810 by Harold Hallikainen

face
flavicon
face

>
> On May 13, 2009, at 4:30 PM, Wouter van Ooijen wrote:
>
>> I am looking for an optocoupler that can handle serial asynch (1MHz is
>> fine) and can operate at 2.5 .. 5.5 V supplies. Must of course be
>> cheap
>> and widely available ;)
>
> the 6N138 and/or 6n137 are widely used in MIDI current-loop to logic
> translators (which is serial async at 31250bps...)  You can probably
> look up other MIDI circuits for other suitable part numbers...
>
> BillW

I've used the 6N137 at 250kbps.

Harold


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2009\05\14@013612 by Antonio Benci

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Why not try these;

http://www.nve.com/il600.php

An alternative to optocouplers.

NB.

Harold Hallikainen wrote:
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2009\05\14@022124 by AGSCalabrese

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>
> On May 13, 2009, at 11:36 PM, Antonio Benci wrote:
>
> Why not try these;
>
> http://www.nve.com/il600.php
>
> An alternative to optocouplers.
>
> NB.

Based on GMR spintronics
http://www.nve.com/Downloads/ab7.pdf

{Quote hidden}

> <Nino_Benci.vcf>-

2009\05\14@022448 by Dario Greggio

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Harold Hallikainen ha scritto:

> I've used the 6N137 at 250kbps.


same here

Dario

2009\05\14@023935 by Wouter van Ooijen

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> the 6N138 and/or 6n137 are widely used

But AFAIK they require 5V supply on the receiving side.

--

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu

2009\05\14@023953 by Wouter van Ooijen

face picon face
> Many Optocouplers from Avago will do. They are not
> expensive and widely available.
> http://www.avagotech.com/pages/en/optocouplers_plastic/plastic_3.3v_digital_optocoupler/

thanx, I will have a look


--

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu

2009\05\14@024240 by Wouter van Ooijen

face picon face
> http://www.nve.com/il600.php
>
> An alternative to optocouplers.

But a bit expensive compared to what I hoped for.


--

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu

2009\05\14@034254 by William \Chops\ Westfield

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On May 13, 2009, at 11:38 PM, Wouter van Ooijen wrote:

>> the 6N138 and/or 6n137 are widely used
>
> But AFAIK they require 5V supply on the receiving side.

Huh.  On the datasheet I found, most of the examples use a "supply"  
voltage of 5V or more, but it's a simple photo-darlington output  
stage, and I don't see anything in the specs that would imply 5V is  
the minimum operating voltage.  Vo(low) is ~0.4V, so it ought to pull  
even low voltage logic low...

BillW

2009\05\14@035033 by Xiaofan Chen

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On Thu, May 14, 2009 at 1:36 PM, Antonio Benci
<Nino.BencispamKILLspamsci.monash.edu.au> wrote:
> Why not try these;
>
> http://www.nve.com/il600.php
>
> An alternative to optocouplers.

If you go that route, maybe it is better to go with established
vendors like ADI (magnetic based) and TI (Capacitive based).
In general digital isolators are more expensive than optocouplers.
They do have much less power consumption though.


--
Xiaofan http://mcuee.blogspot.com

2009\05\14@040127 by Alan B. Pearce

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> I am looking for an optocoupler that can handle serial asynch (1MHz is
> fine) and can operate at 2.5 .. 5.5 V supplies. Must of course be
> cheap
> and widely available ;)

Does it really need to be an opto ... ???

reason for asking is I have recently come across the iCoupler range of chips
from Analog Devices, and one of these is an internally isolated version of a
MAX232 (haven't yet checked if it is pin compatible), with isolated power
being supplied to the RS232 side, all inside the chip.

See http://www.analog.com/en/interface/rs-232/adm3251e/products/product.html
and at US$2.99 @ 1k would probably substitute for a lot of 'standard' MAX232
type interfaces for similar cost.

2009\05\14@050627 by Wouter van Ooijen

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> Does it really need to be an opto ... ???

The intented purpose is an USB-FTDI-opto-wisp648, so the input would be
TTL level, not RS232, but at RS232 waveforms.

> See http://www.analog.com/en/interface/rs-232/adm3251e/products/product.html
> and at US$2.99 @ 1k would probably substitute for a lot of 'standard' MAX232
> type interfaces for similar cost.

I buy my max232 clones for a fraction of that price, at 100's, not 1k.

--

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu

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