The DG408 Single 8-Channel, and DG409 Differential
4-Channel monolithic CMOS analog multiplexers are drop-in
replacements for the popular DG508A and DG509A series
devices. They each include an array of eight analog
switches, a TTL/CMOS compatible digital decode circuit for
channel selection, a voltage reference for logic thresholds
and an ENABLE input for device selection when several
multiplexers are present.
The DG408 and DG409 feature lower signal ON resistance
(<100Ω) and faster switch transition time (tTRANS < 250ns)
compared to the DG508A or DG509A. Charge injection has
been reduced, simplifying sample and hold applications. The
improvements in the DG408 series are made possible by
using a high-voltage silicon-gate process. An epitaxial layer
prevents the latch-up associated with older CMOS
technologies. Power supplies may be single-ended from +5V
to +34V, or split from ±5V to ±20V.
The analog switches are bilateral, equally matched for AC or
bidirectional signals. The ON resistance variation with
analog signals is quite low over a ±5V analog input range.

Features
• ON Resistance (Max, 25°C). . . . . . . . . . . . . . . . . . . 100Ω
• Low Power Consumption (PD) . . . . . . . . . . . . . . .<11mW
• Fast Switching Action
- tTRANS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <250ns
- tON/OFF(EN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . <150ns
• Low Charge Injection
• Upgrade from DG508A/DG509A
• TTL, CMOS Compatible
• Single or Split Supply Operation
• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications
• Data Acquisition Systems
• Audio Switching Systems
• Automatic Testers
• Hi-Rel Systems
• Sample and Hold Circuits
• Communication Systems
• Analog Selector Switch