A New Generation Of Analogue Switches

Most applications for analogue switches fall into two categories: signal routeing and signal conditioning. Different process- ing technologies produce switches with different characteristics. One advantage of the new cmos analogue switches from Siliconix is that they allow you to control signals that fall anywhere between the two power supply rails. Furthermore, these 10 SO +5V +12V 12 -12 V Fig. 1. The DG400 series of analogue switches. high-performance silicon-gate ics, the DG400 family, are pin-for-pin replace- ments for the popular DG200 series. They offer significantly lower on-resistance (rDS(on)=85 Q), lower power dissipation (35 11,W), faster switching speed (ton= 250 ns) and lower leakage current (Is(ofo <500 pA) than the older industry-standard parts. The new devices are shown here in typical circuits, illustrating the benefits they offer. Sample-and-hold functions In most data acquisition systems, many channels are sampled sequentially and then digitized by an analogue-...