Dual 4:1 analog multiplexer with 100 Ohm on-resistance
The Maxim Integrated DG409CY+ is a dual SP4T analog multiplexer/demultiplexer in a 16-pin SOIC package. It routes one of four differential inputs to a common output per channel, with two independent switch circuits on-chip. The part is specified for single-supply operation from 5V to 30V or dual supplies from ±5V to 20V.
Key specs for signal integrity and routing
On-resistance is 100 Ohm maximum, with channel-to-channel matching of 1.5 Ohm, which keeps insertion loss and attenuation predictable across channels. Switching time is 150 ns for both turn-on and turn-off, fast enough for moderate-speed analog multiplexing. Charge injection is 2 pC, a consideration for sample-and-hold or precision integrator circuits where glitch energy matters. Off-leakage current is 500 pA maximum, and channel capacitance is 3 pF (source off) and 14 pF (drain off), which together define the off-isolation and signal feedthrough at higher frequencies. Crosstalk between channels is -92 dB at 100 kHz, a strong figure for audio-frequency multiplexing or multi-channel data acquisition where channel bleed must be minimized.
It is not specified for industrial or automotive under-hood environments where extended temperature operation is required.