Dual SP4T analog switch for precision signal routing
The Maxim Integrated MAX14778ETP+ is a dual SP4T (single-pole four-throw) analog switch, integrating two 4:1 multiplexer/demultiplexer circuits in a single 20-TQFN package. It routes up to four differential or single-ended signals per channel with a maximum on-resistance of 1.5 ohm, keeping insertion loss low in precision analog paths. The -3 dB bandwidth of 75 MHz supports video, RF, and high-speed data signals, while the -103 dB crosstalk at 100 kHz ensures minimal bleed between channels in multiplexed acquisition systems. Operating from a single 3 V to 5.5 V supply over -40°C to 85°C, it fits industrial sensor interfaces, data-acquisition front-ends, and ATE signal routing where signal integrity matters.
The 1.5 ohm max on-resistance is the headline spec for this part. In a precision analog chain, every ohm of switch resistance adds a voltage divider with the source impedance and a thermal-noise floor.
Package and footprint — 20-TQFN with exposed pad
The exposed pad is electrically connected to the die substrate and should be tied to the most negative supply rail.