SPDT analog switch for precision signal routing
Key specs include 35 Ohm max on-resistance, 3 Ohm max channel-to-channel matching, and 250pA max off-leakage current—parameters that keep signal attenuation and DC error low in precision analog paths. Switching is fast: 175ns max turn-on, 145ns max turn-off, suitable for scanning multiple sensor channels in a multiplexed acquisition front-end.
Crosstalk and charge injection—what they mean for signal integrity
Charge injection is 3pC. When the switch turns off, this packet of charge dumps onto the load capacitor, creating a voltage glitch equal to 3pC divided by the load capacitance. Into a 10pF sampling capacitor in an ADC driver, that is a 300mV step—enough to cause a conversion error if settling time is insufficient. Plan for a settling window after the switch command or use a track-and-hold ahead of the converter.
The part is ROHS3 compliant. For BOM lines that require a dual-source option, verify the specific alternate against your supply rails and temperature requirements.