ADG1438 and ADG1439 switches input voltages in single-supply mode

Hi,

The +25 V Max you are referring to comes from the Absolute max ratings table. This is a stress rating that indicates the device will not suffer damage below this voltage. However it does not indicate functionality.

The device is guaranteed to be operational with in the range +/-4.5 V to +/-16.5 V for dual supply and +5 V to +16.5 V for single supply. These are outlined in the datasheet in table 2 for dual supply and table 3 for single supply.

If you are looking for higher voltage supply our ADG5408 device may be of interest. This has a single supply range of 9 V to 44 V.

Would this work for you?

Regards,

David

Thank you for your reply David,

ADG5408 has parallel interface and only one switch can be engaged at a time. I need to randomly access to 200+ channels with voltages up to +18V and as long as 18V is OK I'm fine. Potentially I can connect Vss to the GND and level shift SPI but better not to.

I would appreciate your input David,

Thanks,

Nikolai

Hi Nikolai,

A product like the ADGS5414 could an option for you here. It is a SPI controlled 8 x SPST switch which can be powered with a VDD upto +40V.

The break before make switching of the device enables it to be configured as a mux by external wiring on the PCB and you would be able to select all channels if you like. The following Application Note details the break before make feature in the ADGS5414.

https://www.analog.com/media/en/technical-documentation/application-notes/an-1485.pdf

Regards,

Stephen

Thank you Stephen,

It should work. Are there any chance you have higher count switches (preferably N x 2)? I need randomly connect 204 channels either to GND or test voltage and it will require 52 ICs

Something like MAX14661 chip (16 x 2), but with up to +18V input range. In this case only 13 ICs would be enough. Huge space difference.

Nikolai

Thank you Stephen,

It should work. Are there any chance you have higher count switches (preferably N x 2)? I need randomly connect 204 channels either to GND or test voltage and it will require 52 ICs

Something like MAX14661 chip (16 x 2), but with up to +18V input range. In this case only 13 ICs would be enough. Huge space difference.

Nikolai