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Analog switches offer improved on-resistance

Malvern, Pa. — Vishay Intertechnology, Inc. has released two high-voltage, single- and dual-supply single-pole double-throw (SPDT) analog switches. The DG469 and DG470 devices are identical, except the DG470 provides an enable pin, which puts all of the switches in a high-impedance state, maintaining a “safe state” at power up and preventing accidental signal or power shorts.

The DG469 and DG470 switches are optimized for audio and video signal switching, sample and hold systems, precision data acquisition, relay replacement, and power routing in audio equipment, automatic test equipment, industrial equipment, communications systems, xDSL modems, automotive and avionic systems, and medical equipment. For instrumentation and power routing, the DG470 device's enable pin disconnects both inputs and outputs, guaranteeing that signals and power are not connected until the enable pin is activated, and can be used as a quick “disconnect” function in the event of a fault condition, said Vishay. For audio switching, the enable pin also provides a “mute” function.

The DG469 and DG470 offer a very low 3.6-ohm typical and 4.2-ohm maximum on-resistance with flatness of 0.4 ohm typical. Both devices are rated for 120 mA of continuous current, which is key for relay replacement and power routing. The devices offer a 44-V maximum supply voltage rating, and 57-dB isolation at 1 MHz.

The high-voltage devices are fully specified to operate with dual supplies at ±5 V and ±15 V or a 12-V single supply, and offer up to a ±15-V analog signal range on the outputs and inputs. The switches operate with low power dissipation of 66 microwatts. They feature fast typical switching speeds of 129 ns tON and 80 ns tOFF .

All digital inputs provide 0.8-V and 2.4-V logic thresholds, ensuring low-voltage CMOS/TTL logic compatibility. Each switch conducts equally well in both directions when on, and can handle an input signal range that extends to the supply voltage rails, said Vishay. The devices are offered in a choice of MSOP-8 and SOIC-8 packages.

The DG469 is an improved upgrade for the Vishay Siliconix industry-standard DG419, reducing the on-resistance (of 4.2 ohm instead of 35 ohm) and eliminating the need for a separate VL logic supply voltage. The DG469 serves as a pin-for-pin upgrade for the MAX4659 by offering much lower on resistance, lower power consumption, a higher switch current rating (120 mA vs. 30 mA), and a wider temperature range.
Both devices are available in the standard and extended temperature ranges of -40°C to +85°C and -40°C to +125°C.

Availability: Samples of the DG469 and DG470 SPDT analog switches are available now. Production quantities are available with lead times of six to eight weeks for larger orders.
Product information: DG469 and DG460

Vishay Intertechnology , www.vishay.com

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