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Analog switches simplify design

Posted: 30 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:vishay intertechnology? analog switch? dg2714? monolithic cmos? dg2715?

Offering low on-resistance and low-level logic control through the full voltage range of 1.6V to 4.3V, the new analog switches from Vishay Intertechnology Inc. are targeted at end products such as cellphones, STBs, PDAs and media players.

Built on the Vishay Siliconix low-voltage submicron CMOS process, these new devices can switch both audio and low-voltage power in portable applications, and can support continuous currents up to 300mA for Reed Relay replacement and load switching. Their ability to run directly from Li-ion battery power helps to simplify designs by removing the need for a voltage regulator.

All products offer bidirectional signal flow and rail-to-rail signal swing. A choice of multiple configurations, including double-pole/double-throw (DPDT), single-pole/double-throw (SPDT) and single-pole/single-throw (SPST), provides flexibility to the designers of STBs, video games, and medical and industrial applications, Vishay added.

Low-level logic control is guaranteed throughout the voltage supply range. For example, the DG2799 DPDT analog switch guarantees 1.6V logic at a 4.3V power supply, said the company. The device features low on-resistance of 0.45 ohms at 2.7V and switching times of 57ns (tON) and 45 ns (tOFF). It is packaged in a QFN-16, 3-by-3mm package that helps to reduce board space requirements.

The new DG2714 is a break-before-make SPDT monolithic CMOS analog switch that combines low-voltage operation from 1.6V to 3.6V, switching times of 51ns (tON) and33ns (tOFF), and on-resistance of 1.2 ohms in a compact SC-70 package. Meanwhile, the DG2715 and DG2716 are bi-directional SPST switches that feature low-voltage operation from a single 1.65V to 3.6V supply, fast switching speeds of 29ns (tON) and 26ns (tOFF), and low on-resistance values of 0.6 ohms at 2.7V and 1.5 ohms at 1.8V. These two SPST switches, available in the SC-70 package, also offer an on-resistance flatness of 0.2 ohms.

Also released recently, the DG2741, DG2742 and DG2743 are low-voltage, single-supply, dual SPST analog switches with on-resistance values down to 0.8 ohms at 2.7V, switching speeds of 30ns (tON) and 28ns (tOFF), and the ability to handle signals over the entire analog voltage range. On-resistance flatness and matching of 0.18 ohms and 0.08 ohms, respectively, ensure high accuracy between channels. The DG274x switches are available in SOT23-8 and MSOP-8 packages.

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