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From: Spehro Pefhany
Subject: Re: What's different from "analog multiplexer" and "digital multiplexer" ??
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Date: Tue, 21 Jan 2003 14:33:24 GMT
NNTP-Posting-Date: Tue, 21 Jan 2003 09:33:24 EST
On Tue, 21 Jan 2003 14:29:47 GMT, the renowned John Popelish
>> I have two questions:
>> 1.How to tell what's different from analog multiplexer and digital
>An analog multiplexer acts as a multi position switch. Its main
>effect on the signal is to add series resistance (the equivalent of
>contact resistance). These can be used to pass digital signals as a
>subset of analog but without regenerating them.
>Digital multiplexers are logic functions (something like multi
>position switches) with logic buffers on their outputs that generate
>fresh signal levels for logic ones and zeros. All signals applied
>will be converted to digital highs and lows or the best approximation
>of those the output stage can manage.
I suppose it's possible that there are analog muxes with buffers in
there (and thus unidirectional), but I can't think of any offhand.
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