What is the impedance of SPST switch like ADG801 when it is un-energized (no supply to VDD)?
I downloaded the SPICE model and tried to measure the SPST impedance with VDD = 0V.
I provided a 1V supply to the "D" and connect "S" to the ground, and I measured a 161.5mohm of impedance.
Isn't a normally-open (NO) SPST will be in open or high impedance state when un-energized?
Hi, Chunlee.
When VDD=0V, the switch is turned off and is at high impedance state. However, there are protection diodes to the supplies available at the source, drain and logic control pin. These protection…
Hi Chunlee,
Looking at your application, I would suggest to use a fault protected switch. These switches are guaranteed off and don't get damaged even when there are analog signals present at the inputs…
Hi Chunlee,
The ADG4612 has the lowest Ron for our fault-protected parts for single supply operation application like yours.
However, if you still wish to use ADG801, then there are possible solution…
