Active 8:1 mux with 3.5 Ohm Ron — precision analog signal routing
The MAX4638EUE+T: Channel-to-channel matching holds within 100 mOhm, so all eight inputs see the same insertion loss — no gain calibration per channel needed in a multiplexed data-acquisition front end.
Supply flexibility and signal bandwidth
Dual ±2.5 V rails let it pass bipolar analog signals up to ±2.5 V swing — useful for industrial signal chains with ±10 V sensors scaled down by a divider. The 50 MHz -3 dB bandwidth supports video-rate signals and high-speed digitizers; the 18 ns turn-on and 7 ns turn-off times keep channel switching fast enough for 10 MSPS multiplexed ADC systems. Crosstalk is -85 dB at 1 MHz — a 50 mVpp signal on an adjacent channel leaks only about 2.8 µV into the active channel, well below the noise floor of a 16-bit ADC.
Charge injection and leakage — the precision analog specs
Charge injection is 13 pC typical — when the switch opens, that glitch charge dumps into the sampling capacitor. In a 100 pF hold cap it creates a 130 mV step, so this mux is better suited for continuous-time signals than for switched-capacitor sample-and-hold front ends without an external buffer. Maximum off-state leakage is 250 pA — at 25°C the typical value is lower, but budgeting the max across temperature keeps the error term under 0.01% of a 10 µA sensor current. Source-off capacitance is 9 pF, drain-off is 40 pF — the drain capacitance dominates the RC time constant at the output node, so keep the downstream load impedance below 50 kOhm to avoid bandwidth rolloff.
Package, temperature grade, and compliance
The supplier device package is 16-TSSOP. ROHS3 compliant — no restricted substances; fits EU and global environmental regulations without exemption paperwork.