STG5678

Application hint

Doc ID 14580 Rev 3

15/23

6

Application hint

6.1

Input signal dynamic range

The STG5678 negative analog switch allows input signals that fall below 0 V to pass through

the switch without signal distortion. The input signal dynamic range VI consists of a

positive-region and a negative-region.

The positive-region is limited by the level of VCC. The negative-region is limited by the

difference between VCC and 5.5 V. The effect of this is that, the higher the VCC, the smaller

the operating range in the negative region.

For example, if VCC = 3.6 V, the input signal dynamic range is from -1.9 V to 3.6 V.

Figure 13.

Application diagram

0V

VCC

VCC-5.5

Negative SW

VCC

VI

Negative region