Biasing of HSWA2-30DR+ SPDT Switch with a 5V Supply Voltage

The HSWA2-30DR+ switch uses a patented CMOS technology and operates with single positive supply voltage from 2.7V to 3.3V. This model has a patent pending low noise negative voltage generator which produces internally the negative supply voltage required for CMOS logic.

For applications where the system voltage is +5V instead of +3V specified for CMOS switches, a resistive voltage divider should be used to reduce the voltage from +5V to +3V as shown below in Figure 1. For low noise applications it is preferable to use a low noise LDO (Low Drop-Out) voltage regulator such as MAX8878 (preset to 3V), as shown in Figure 2.