Hello,
I'm looking for something that's in some ways like a multiplexer (MUX). However, it needs to function in quite the opposite way that is, only one of the inputs (specified using select lines) needs to be disconnected from the common, with the rest remaining connected, as in the picture below.
It would be nice to have some help in knowing if there's a name for this kind of routing and also if any ICs perform this function. Please note that this is not for implementing digital logic but for an analogue application.
Thanks in advance.
I'm looking for something that's in some ways like a multiplexer (MUX). However, it needs to function in quite the opposite way that is, only one of the inputs (specified using select lines) needs to be disconnected from the common, with the rest remaining connected, as in the picture below.
It would be nice to have some help in knowing if there's a name for this kind of routing and also if any ICs perform this function. Please note that this is not for implementing digital logic but for an analogue application.
Thanks in advance.
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The only thing I can think of is using a regular mux to drive 'muting devices' to deselect/disconnect the specified channel.
With 40xx serie CMOS use a 4053 as a demux to drive control pin of 4066 analog switches.
The 4 Common pins of 4053 will be used as input connected to gnd and 4053 outputs will drive 4066 control pin with the help of a pullup resistor.
Applying a binary code on 4053 demux input will switch to ground corresponding ouput and open corresponding 4066 switch. Only one at a time.
The 4 Common pins of 4053 will be used as input connected to gnd and 4053 outputs will drive 4066 control pin with the help of a pullup resistor.
Applying a binary code on 4053 demux input will switch to ground corresponding ouput and open corresponding 4066 switch. Only one at a time.
Same : 4052 and 4053 are equivalent for the OP use case where a 2->4 demux is required
For more than 4 switches, a 4052 is required in order to have a 3->8 demux.
For more than 4 switches, a 4052 is required in order to have a 3->8 demux.
Yes, thank you. There doesn't appear to be a straightforward solution and it looks like 4016/66 and a decoder/demux is probably the way to go...
Unfortunately that would also ground anything else ...
How about a 4066, each control pin tied to B+ with a pull-up resistor. A single pole, 4 position switch pulls the selected channel’s control pin to B- to open the desired channel.
You could probably also make a 4-input summing amp. Mute one input with a JFET to ground. That'd likely be lower distortion than a CMOS switch. Not sure if you care, but I thought I'd mention it just in case.
Tom
Tom