CD4052B: vdd selection if using as ADC input mux

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.

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

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.

Hi Sandesh,

Thanks for the advice.