The MAX4712CUE+ is a quad single-pole single-throw (SPST) normally-open analog switch from Analog Devices, packaged in a 16-TSSOP (4.40 mm width) for surface-mount assembly. It belongs to the MAX4712 family of low-voltage, low-charge-injection switches designed for precision analog signal routing in test equipment, data acquisition systems, and audio switching matrices.
On-resistance and channel matching for signal fidelity
Maximum on-resistance is 25 Ohm, with channel-to-channel matching held to 200 mOhm — this tight delta means the voltage drop across each switch leg stays nearly identical, critical for maintaining gain accuracy in multiplexed analog front-ends.
Switching speed and dynamic performance
Turn-on time is 125 ns max, turn-off 80 ns max — fast enough for 4 MHz sample-rate multiplexing without introducing settling-time errors between channels. Crosstalk is rated at -87 dB at 1 MHz, meaning less than 0.005% of a signal on one channel couples into an adjacent off-channel — suitable for 16-bit audio or precision sensor scanning where channel isolation matters.
Charge injection, leakage, and capacitive load
Charge injection is 25 pC typical — when the switch opens, this small packet of charge dumps into the load capacitance, producing a voltage glitch of about 3 mV into a 10 pF sample-and-hold cap; the designer should budget this into the acquisition settling window. Off-channel leakage is 500 pA max, and channel capacitance is 8 pF on both source and drain sides — low enough that a 10 kOhm source impedance sees less than 0.1 LSB error in a 12-bit system at 100 kSPS.