| Electronics > Projects, Designs, and Technical Stuff |
| Finding the right analogue switch? |
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| dzseki:
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... |
| mikerj:
--- Quote from: dzseki on June 06, 2019, 10:35:30 am ----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... --- End quote --- Why do you say it's not designed for analog signals? Looks like a high bandwidth analog switch to me. |
| dzseki:
Well, they simply don’t mention analog signals in the datasheet at all, nor they give distortion specs, while the other mentioned datasheets are containing these, so I got suspicious, that’s all. |
| SiliconWizard:
Would the ADG633 fit your requirements? |
| Benta:
Vishay DG417/418/419. |
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