The ADG725/ADG731 are monolithic CMOS 32 channel/dual 16 channel analog multiplexers with a serially controlled 3-wire interface. The ADG732 switches one of thirty-two inputs (S1-S32) to a common output, D. The ADG725 can be configured as a dual mux switching one of sixteen inputs to one output or a differential mux switching one of sixteen inputs to a differential output. These mulitplexers utilize a 3-wire serial interface that is compatible with SPITM, QSPITM, MICROWIRETM and some DSP interface standards. On power-up, the internal shift register contains all zeros and all switch are in the OFF state.