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Old 14th January 2013, 08:34 AM   #81
acko is offline acko  Australia
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Default Isolator Specs

Haven't finalized on the actual part but as shown specs are 150Mb/s or better
Narrowing on TI ISO7240 150/Mb/s, 8.5 ns or Silabs 8440 150Mb/s 6ns
Of course, any other suggestions most welcome

In case wondering why speed and delay matters when the signals would be re-clocked anyway is for those who may want to use just the isolated outputs only from the above chips and looking for the best. So again, another flexible option from this design.
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Last edited by acko; 14th January 2013 at 08:46 AM.
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Old 14th January 2013, 08:41 AM   #82
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Hmm... dunno why but Farnell had the adum3440 at 32ns when the datasheet claims 5ns, and neither they or RS stock the Silabs part.

Last edited by KlipschKid; 14th January 2013 at 08:46 AM.
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Old 14th January 2013, 10:24 AM   #83
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Old 14th January 2013, 10:44 AM   #84
acko is offline acko  Australia
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Default ADum3440 isolator

Quote:
Originally Posted by KlipschKid View Post
Hmm... dunno why but Farnell had the adum3440 at 32ns when the datasheet claims 5ns, and neither they or RS stock the Silabs part.
This is also a 150Mb/s part but propagation delay is 32ns. The 5ns refers to pulse-width distortion.

The Silabs 8440 is not available from digikey either.
Anyway, they all have identical pin-outs and footprint so you have also choice here. BTW, please do not order components yet until we have firmed up the design.
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Last edited by acko; 14th January 2013 at 11:02 AM.
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Old 14th January 2013, 11:15 AM   #85
nik.d is offline nik.d  Serbia
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Old 14th January 2013, 11:39 AM   #86
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palmito USA x1
tagheuer Canada x1
shoom UK x1
Diyfan, USA x1
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ccliu, Taiwan x2
leejh x2
bk856er, USA x1
linuxfan, Australia X1
bigpandahk, Hong Kong x 2
rsotirov, Canada x 1
DQ828, Australia x 1
Esl 63, Sweden, x 1
necplusultra Canada x1 (depends on shipping halfway accross the world)
Awh, uk, x1
enantra, Spain x3
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Old 14th January 2013, 11:57 AM   #87
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Quote:
Originally Posted by acko View Post
This is also a 150Mb/s part but propagation delay is 32ns. The 5ns refers to pulse-width distortion.

The Silabs 8440 is not available from digikey either.
Anyway, they all have identical pin-outs and footprint so you have also choice here. BTW, please do not order components yet until we have firmed up the design.
Thanks - Ti part looks like my favourite.... and they do samples.
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Old 14th January 2013, 12:52 PM   #88
qusp is offline qusp  Australia
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Quote:
Originally Posted by KlipschKid View Post
Thanks - Ti part looks like my favourite, because they do samples.
fixed

its not the best part, the IL is, but its free if your concience is
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Old 14th January 2013, 01:10 PM   #89
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Quote:
Originally Posted by qusp View Post
its not the best part, the IL is,
Prove it and I'll buy the IL.

Quote:
Originally Posted by qusp View Post
but its free
Yes, it's free. Legally free. No restrictions except that I don't export, use for the military etc or sell it. And that makes me love Ti. And love is why I think Ti has the best part.

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Originally Posted by qusp View Post
if your concience is
My conscience is at peace because of the OPA627 I bought. And the SRC4193 EVM. And PCMs...... and ....
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Old 14th January 2013, 01:24 PM   #90
qusp is offline qusp  Australia
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already have bought the IL for the fifo isolator last year. actually yes there is restrictions, its supposed to be used to prototype products for sale =) then those additional restrictions on those sales, what fake sales targets did you put in the form? hehe.

everyone does it, but I try to keep it to a minimum these days and I am actually saving it for product research. I dont think listening tests count as assessment for hi-speed data isolators... not what they have in mind.

we've been through all of this with Ian, the IL and Si are the best parts, but on a value basis the Si as its much cheaper. I prefer magneto coupled to capacitive though I think.
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