Quad SPST-NO switch with sub-2Ω on-resistance
The MAX4678EUE+T is a quad single-pole single-throw normally-open analog switch from Analog Devices, built for precision signal routing where low on-resistance and channel matching matter. Each of the four SPST-NO switches presents a maximum 1.6 Ω on-resistance, with channel-to-channel matching held to 200 mΩ — this keeps the insertion loss uniform across all four paths in a multiplexed signal chain.
Signal integrity: bandwidth and crosstalk floor
With a -3 dB bandwidth of 66 MHz and crosstalk rated at -84 dB at 1 MHz, the MAX4678EUE+T handles analog signals up to video frequencies without coupling between adjacent channels. The 350 ns turn-on and 150 ns turn-off times support switching rates that keep up with most audio, data acquisition, and instrumentation multiplexing requirements.
Supply rail flexibility and charge injection
Charge injection is 85 pC — a figure to budget in sample-and-hold or precision DAC output stages where the injected charge settles into the hold capacitor.
Leakage and capacitance for high-impedance inputs
Maximum off-leakage current is 1 nA, and the channel capacitance is 85 pF per pole — both specifications that preserve signal accuracy when the switch is in the high-impedance state, such as in a multi-channel data logger or a precision voltage reference scanner.