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CD4052B: CD4052 HELP with crosstalk

Ajay Dillikar
Prodigy 65 points
Part Number: CD4052B
Other Parts Discussed in Thread: TS12A12511,

Hello All,

      I am using CD4052 as multiplexer. Giving 2 analog Signals and one Digital audio coming from Optical TOSLINK After converting to Analog and then passing via RC Filter. 

If I probe under analog and digital input pins of analog multiplxer pins 1 and 2 I have traces of 1 heard on 2.  Though my inputs are 400 to 500 mv input and  upon selection of multiplxer via microncontroller we are getting the output at pin 3 and 13 of cd4052. but with cross talk of input signal of 1 at 2. and output 3. 

My multiplexer is working on 5v I tried biasing it on 12V too. 

Can anyone tell me what I am doing wrong or what I need to do ?

  • 0
    TI__Mastermind 26335 points

    Hello Ajay,

    With the CD4052B, we do expect there to be some level of cross talk between the channels.  From the datasheet, we would expect the signal from the non-selected channel to be attenuated 40 dB for the operating conditions posted in the table below.  However, depending on the supply voltage and frequency it is possible that the cross talk could be better or worse.  Typically a lower supply voltage to the mux will have less attenuation with regards to cross-talk.  For higher supply voltages, the cross-talk will exhibit a positive linear change in attenuation with respect to frequency.  An example of such typical behavior can be observed in figure 1.  Since you seem to be concerned with having very low cross talk, perhaps you may consider the TS12A12511.  This part can handle the voltages you want and exhibits the lower cross talk seen in figure 1.

    Table 1

    Figure 1

    You may also look at the TI.com switch selection tool and sort devices by the cross talk parameter.  This isn't extremely accurate since crosstalk is a function of frequency but it can get you close.