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Old 12th November 2014, 10:40 PM   #1
Luke123 is offline Luke123  Canada
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Default Analog switches

Hello

I've been using the SSM2402 audio analog switches for a long time with excellent results but I just discovered it's been discontinued since few years.

Any suggestion for an equivalent, Analog Devices or other?

I need to apply on 18 V or less supply, below 100 ohms ON resistance, great isoltaion resistance, very low distortion, 2 x spdt function, pin DIP version, Rhos or not...

Thanks!

Luke
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Old 12th November 2014, 11:09 PM   #2
DUG is offline DUG  Canada
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Digi-key search:

Interface - Analog Switches, Multiplexers, Demultiplexers | Integrated Circuits (ICs) | DigiKey

http://www.analog.com/static/importe...ts/ADG5436.pdf

http://datasheets.maximintegrated.co...G401-DG405.pdf

Have fun.

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Old 13th November 2014, 01:42 AM   #3
Luke123 is offline Luke123  Canada
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Dug

Thanks for reply.
But the first is surface-mount.
The second one is spst and no-stock.
I already made that search from Digi-key online.
The only one I found was ADG436 but is way less than SSM2402 but not bad.
Could be the one but I'm really looking for a 2402 equivalent.

Luke
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Old 13th November 2014, 02:34 AM   #4
DUG is offline DUG  Canada
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DG403 not 401
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Old 13th November 2014, 01:08 PM   #5
Luke123 is offline Luke123  Canada
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Hello Dug

Hisshhh!...$10.+ each and no mention about distortion.
Off isolation of 72 dB...Mmmm, not great for muting function unle$$ you u$e two in ca$cade.
Next order from DGK, as they have 1000+ in stock, I'll try measuring one against 2402.

Thanks Dug!

Luc
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Old 13th November 2014, 03:10 PM   #6
mlloyd1 is offline mlloyd1  United States
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maxim makes a number of nice parts that i think are still available in dip package.
check out their site and look at max312 or max352 - check the part numbers for exact configuration of switches; i going from memory here, which is risky at best

mlloyd1
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Old 13th November 2014, 04:13 PM   #7
Luke123 is offline Luke123  Canada
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Hello mlloyd1

Great. I've just checked for DG412 series and it looks interesting but it has poor isolation of only 68dB..$7.75 DGK.
And equivalent ADG412 from AD ...$5.08.
So all these cmos SW seem to have great Ron but poor Off Isolation (65-70dB) and unknown distortion ratings.
And bipolar SW like SSM2404... ordinary Ron (60 ohms) but over-needed but superb isolation of 120dB and AD specify distortion ratings of them.
Possible to increase Off isolation on cmos but external TTL or something probably needed to achieve this spec , so more complex.
Great infos anyway... good possibilities...thanks!

Luc

Last edited by Luke123; 13th November 2014 at 04:16 PM.
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Old 13th November 2014, 05:08 PM   #8
mlloyd1 is offline mlloyd1  United States
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yes, i agree not much in the way of choices for a similar performance to the old SSM switches. i guess we just didn't buy enough of them for ADI to keep them around ...

you could also try discrete jfets. i think mcintosh was doing that for a while.

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Old 13th November 2014, 05:55 PM   #9
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The Intersil ISL54405 is a fantastic switch for audio, but it's only surface mount and you need to use it to switch current, not voltage, by loading it into a virtual ground. I have a test circuit using it now - off isolation is over 140dB, unmeasurable distortion on an AP2322, low cost, reasonably low capacitance, and a nice slow switch function to prevent clicks.

I think you'll have to get used to SMT or stay in the 80s land of awful CMOS switches!
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Old 13th November 2014, 06:16 PM   #10
Luke123 is offline Luke123  Canada
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Hello Monte McGuire

Current switching...
Just for simple personnal sake of curiosity, could you please show an example of such an application?

Thanks
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