This document describes the features and applications of DG408/409 Vishay Siliconix's 8-Ch/Dual 4-Ch high-performance CMOS analog multiplexers.
The DG408 is an 8‑channel single‑ended analog multiplexer and the DG409 is a dual 4‑channel differential analog multiplexer. Both devices use a 3‑bit (DG408) or 2‑bit (DG409) binary address to connect selected inputs to a common output, with break‑before‑make switching to prevent crosstalk. They feature low on‑resistance, low charge injection, fast transition times, and TTL‑compatible control inputs, making them suitable for high‑speed data acquisition, audio routing, ATE systems, and battery‑powered instrumentation.
The datasheet provides detailed specifications, pin configurations, truth tables, ordering information, typical characteristic curves, and application hints such as over‑voltage protection using small‑signal diodes. Absolute maximum ratings include a 44 V supply rating and a wide operating temperature range from –55 °C to +125 °C (depending on package suffix).
| Maximum Supply Voltage | 44 V |
|---|---|
| Low Power Consumption | 10 pA |
| On‑Resistance (RDS(on)) | 125 Ω (typical, Vp=+10 V) |
| Charge Injection | 20 pC |
The devices are rated for a maximum supply voltage of 44 V.
The DG408 provides eight single‑ended channels that can be selected via a 3‑bit address.
Typical on‑resistance is 125 Ω when Vp = +10 V.