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Original question:

CD4052B: CD4052 Any issues using 3.3 V vih?

CD4052B: vdd selection if using as ADC input mux

James Zhan
Expert 4365 points
Part Number: CD4052B
Other Parts Discussed in Thread: SN74LV4052A, TMUX1309

Hi team,

My customer is using CD4052 for ADC input(0-3.3V) mux function, should they connect the cd4052 VDD greater than 3.3V to avoid output swing limit? what voltage should be enough for this application?

Thanks.

  • 0
    Guru 300430 points

    Transmission gates have their lowest resistance at the rails, so this supply voltage is fine for these signals.

    But CD4000 family devices are optimized for voltages above 5 V (at 3.3 V, the resistance might be above 1 kΩ), so you should better use a low-voltage device like the SN74LV4052A or TMUX1309.

  • 0
    TI__Mastermind 48587 points

    Hi James,

    Clemens is correct - transmission gate architecture - which is employed by this part - can pass rail to rail signals. However at 3.3V the on resistance will be very high. The suggestions that Clemens mentioned are good options, but I'd specifically like to point out the TMUX1309 - it is the same configuration and channel count with good specs at 3.3V - it is an upgrade from the current part that is being used and looking at the 1ku pricing it looks like the TMUX1309 is also cheaper than CD4052 device. 

    Please let me know if you have any other questions and I will see what I can do!

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    TI__Expert 4365 points

    Hi Parker,

    Thanks for the detail comments.

    But could they just use 5V for VDD to avoid the high ON-resistor on CD4052? They may not want to change the part number so far.

    Thanks.

  • 0 in reply to James Zhan
    Guru 300430 points

    The A/B signals must have the same voltage as VDD.

    All three devices are pin compatible.

  • 0 in reply to James Zhan
    TI__Intellectual 2694 points

    HI James,

    Since the customer does not want to change to the recommended devices at this point, they can use the VDD = 5V supply and as you can see in the datasheet, the RON resistance will be in the 470-1K+ohm range. Also, as noted by Clemens, please use same voltage rail for the control pins.

    Thank you.

  • 0 in reply to Sandesh Rawool
    TI__Expert 4365 points

    Hi Sandesh,

    Thanks for the advice.