[sdiy] selecting muxes??

[media.nai at rcn.com]

>Howdy: inline

???

>> >The 4000 series have limited voltage range... not ideal for bipolar
>> >supplies except with some dirty tricks (like +/- 7.5V supplies or
>> >cheating on the negative supply).
>>
>>I checked again.  Many of the 4000 (4051, 52, 53) series muxes have Vdd,
>>Vss, and Vee power pins, and can handle AC signals.
>
>Same comment.... You are limited to 18V total, maximum so you cannot use
>>the standard +/- 12 to 15V supplies.  The on-resistance variation
>over the full voltage range is NOT very good.

OK :)

>OTOH, units like the Prophet V used the dirty tricks to get quite
>acceptable performance out of 4000 series CMOS analog switches...

Do you know what those tricks were??

>> >There is also "charge injection" as a spec which relates to how much of
>> >the command signal gets coupled into the switched signal. This can be
>> >very important in S/H apps etc.  Less is better.
>>
>>OK :)  How would that spec be listed??
>
>As "Charge Injection" in (your small prefix here) coulombs.
>
>If it doesn't say you don't want to know....

It doesn't seem to be listed for any of the 4000 series muxes.

>>Do you know a vendor in the US for the Siliconix DG series??
>
>Check the Vishay- Siliconix website for the distributor near you...
>;^)

Oh, that's helpful ;)


THANX!!  :)