Hello,
We currently have a preliminary design which uses multiple TMUX1108s to create a 2-stage cascaded MUX. Inputs to the first stage of the TMUX1108s are analog inputs ranging from 0V - 4.096V, inputs to the 2nd stage are the outputs from the 1st stage MUXs, and the output of the 2nd stage MUX goes to an ADC (AD9225). Vdd for every MUX is 5V and Vss is grounded. 1st stage MUX switching occurs at upwards of 3MHz, which is pretty fast I believe. I don't see data on switching frequency limits in the datasheet, so if those exist please provide them
I can sweep & measure the 1st stage MUX inputs and confirm that they are being applied between 0V - 4.096V as expected, but when I measure the output of the 2nd stage MUX before the ADC it seems to saturate at about 0 - 3V maximum. I do not have the capability to measure data after the 1st stage MUX. So to be clear: I can apply an input to the first stage MUX that is 4V, but I only read 3V maximum prior to going into the ADC. From 0V to about 2.5V it is linear as I expect, but from 2.5V to maximum is compresses and saturates.
Could use some help. If there is a breadboard available I'd be interested in that as well
Thanks
-David