I’m in need for an analog switch (SPDT, or SPST) for switching wide bandwidth analog signals, the signal is bipolar, but not symmetrically, ie. varies between -100mV and say +1V.
I am tempted to use single supply switches as well either as-is, or perhaps shift the GND pin to -0.6V (by a single diode), and I may translate the logic levels accordingly (if it is needed at all).
-Because the source impedance is 75 Ohm so the switch should have low (on) input capacitance: <10pF
-The on resistance should be as low as possible: <50 Ohm
-Switching speed is not critical: <100ns
-Bandwidth: >500MHz
Regarding the bandwidth, I want my bandwidth at the output of the switch, I expect the load on the switch output to be 1M Ohm||4pF worst case, hence my requirement on the low resistance.
I have been looking at these sofar:
-ADG1233: it falis at the low on resistance requirement (>120 Ohm), but should be OK.
-TS12A44514: it fails in low input capacitance criteria (>19pF)
-TMUX154E: it would meet all criteria, but this switch is not meant to used with analog signals, so I am hesitnant on this model yet...