Author Topic: Help! Trying to figure out how to hook up analogue switch  (Read 120 times)

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Offline fuzzfuzzfuzz

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Help! Trying to figure out how to hook up analogue switch
« on: April 23, 2021, 11:33:20 am »
Hi,

I'm trying to use some DG333A analogue switches (to switch audio). I've been looking at the datasheet but I'm not entirely sure how I'm supposed to hook it up for single supply operation.

The chip has a V- and a GND pin. Should I connect both to ground? Or if not which one do I want to connect to ground?

Sorry I'm sure this is really obvious to anyone who knows what they are doing..

[attach=1][attach=2] [attachimg=1][attachimg=2]

Thanks!
 

Online Ian.M

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Re: Help! Trying to figure out how to hook up analogue switch
« Reply #1 on: April 23, 2021, 11:47:51 am »
Its fairly simple:  The internal analog switches themselves run off the V+ and V- supplies, and all their pin voltages must *always* be within the rail voltages connected to V+ and V-.  Both V+ and V- must be connected.   The control logic uses Gnd as its input logic '0' level reference so you need to connect Gnd to the ground(0V) of whatever is controlling it.  The control circuit must *NOT* be floating with respect to V+ and V-, and for correct operation, Gnd must be between (V+)-4V and V-.
 

Offline fuzzfuzzfuzz

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Re: Help! Trying to figure out how to hook up analogue switch
« Reply #2 on: April 23, 2021, 11:53:26 am »
Thanks!
 


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