DG403 replacement

Hey Roy,

What's the application here? A good solution may be in the TMUX7213 which will have the inverted logic on the pins (2 active high; 2 active low) and will support up to ±22 V (really this supports a VDD - VSS =< 44 ). The TMUX7213 also comes in the TSSOP and WQFN packages which should be smaller than the SOIC and PDIP packages shown in the DG403 datasheet. It also looks like the DG403 needs an extra logic supply which our part will not need.
The DG403 also only has 2 control logic pins to control the 4 channels. If that is a desired function, they can simply tie two of the digital selects together. 

Thanks,
Rami

Hi Rami,

Thanks for information. I think the TMUX7213 could meet our requirements. May you let me know if we could use below structure?

Roy

Hey Roy, 

Yes this should be fine but some notes to be aware of. By shorting the signal outputs themselves together there will be added capacitance which will limit the frequency performance and timing specs of this. You'll be seeing the on capacitance + the drain off capacitance. Additionally there will be some leakage back into the unselected input. It will be in the nA range so it may not be anything to worry about, however, the added capacitance may be a bigger concern. 

If the outputs are to be shorted, they're effectively creating a 2:1 switch out of 2 1:1 switches. Is there a reason a 2:1 switch isn't just used? 2 x TMUX7219 can do this without needing to short any outputs and lose timing and bandwidth performances. TMUX7219 is part of the TMUX72xx family so it will share similar characteristics as the TMUX7213 we discussed above

Thanks,
Rami

Rami,

Thanks for information.

We modify to use TMUX7219. Could you let me know if below requirement could be achieved?

Below is our connection. May you help check it?

Regards,

Roy