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Analogue switches suit audio, video and data

Edited by the Electronicstalk editorial team Sep 27, 2007

High-voltage analogue switches combine extremely low on-resistance and low leakages with a compact size.

Five new low-impedance, high-voltage analogue switches feature on-resistance as low as 10ohm for audio, video and data switching applications.

The new devices include the dual-supply single-pole/single-throw (SPST) DG467, DG468, DG447 and DG448 and the single-pole/double-throw (SPDT) DG449.

By combining extremely low on-resistance (10ohm for the DG467 and DG468 and 25ohm for the DG447 and DG448) and low leakages with a compact size, the devices are also ideally suited as improved drop-in replacements for MAX4647, MAX4648 and MAX4649 analogue switches.

Typical applications will include high-speed, low-error switching, routing and data acquisition in precision test equipment, instrumentation, communications systems, PBX and PABX systems, audio equipment, relay replacement, redundant telecomms systems, PC multimedia boards and hard disc drives.

The DG447 and DG467 SPST switches are normally closed, whereas the DG448 and DG468 SPST switches are normally open.

The DG449 is an SPDT switch with one normally open contact and one normally closed contact.

The devices operate either from a single +7 to 36V supply or from dual +/-4.5 to +/-20V supplies.

The SPDT DG449 is optimised for switching video in board- and system-level devices.

With its 38ohm on-resistance, it reduces the switching losses to less than 0.5dB and eliminates the need to adjust op amp gain settings.

All the devices provide a wide +/-15V analogue signal range and offer simple interfacing by not requiring a VL logic supply.

The devices feature rail-to-rail signal handling and are TTL and CMOS input compatible.

Samples and production quantities of the new high-voltage analogue switches are available now, with lead times of eight to 10 weeks for larger orders.

Pricing for US delivery in 1000-piece quantities is $0.95 each for the DG447, DG448, and DG449; $0.45 for the DG467; and $0.55 for the DG468.