ADG904 multiplexer availability

Discussion about this major DATV Project. See https://wiki.batc.org.uk/The_Portsdown_Transmitter
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G3UKV
Posts: 19
Joined: Fri May 12, 2017 6:19 pm

ADG904 multiplexer availability

Post by G3UKV » Tue Jan 16, 2018 7:35 pm

Building up the RF output switch.
The recommended IC ADG904BRUZ Farnell (stock number 2074875) (and also the Digikey ADG904BRUZ-ND) are both 'back order' and not due back in stock until March or even July.
Is the ADG904-R (Farnell 2460645) equivalent? Both data sheets look the same - but haven't read every word of the 17 pages.
If not compatible, does anyone know of a source of this chip with immediate delivery ?
73 Martyn G3UKV

MN-tech
Posts: 59
Joined: Thu Aug 30, 2012 6:01 pm

Re: ADG904 multiplexer availability

Post by MN-tech » Tue Jan 16, 2018 8:01 pm

The difference is that the -R connects the unused ports directly to ground while the standard version does it through a 50 load. Either version is OK for the output switch.

g8gtz
Posts: 1732
Joined: Wed Apr 07, 2010 6:26 pm

Re: ADG904 multiplexer availability

Post by g8gtz » Tue Jan 16, 2018 8:30 pm

Hi Martin,

As I said in the previous post I do have a spare -R if needed.

viewtopic.php?t=5307&p=14521#p14521

73 Noel

g8gtz
Posts: 1732
Joined: Wed Apr 07, 2010 6:26 pm

Re: Arrow Electronics

Post by g8gtz » Wed Jan 17, 2018 6:08 pm

Neil, G4LDR, who is also building a Portsdown but not registered on the forum, found that Arrow Electronics had stock - https://www.arrow.com/.

He commented
I found a company in Los Angeles, bought 3 for $11 and got free shipping, and arrived in 4 days including the weekend and they were not in a small box; can’t imagine they made any profit!
They may be a useful source for other hard to get components...

73 Noel - G8GTZ

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M5TXJ
Posts: 347
Joined: Wed Jul 05, 2017 8:34 pm

Re: ADG904 multiplexer availability

Post by M5TXJ » Fri Jan 19, 2018 8:40 am

I believe that Arrow have a distribution centre in Holland, this may account for the free shipping and fast delivery.

73 Dave
...are you sure I can't use a pair of 813's?... :shock:

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