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CMOS analog muxes: consumimg low power

Vishay Intertechnology Inc. has released two new muxes that are optimized for ±15V high-precision, low-noise signal switching in data acquisition, industry process control, test and measurement, and medical systems.

The design of the eight-channel DG508B and dual four-channel DG509B makes the devices suitable for high-precision multiplexing in the analog front end of A-to-D networks, where faster and more accurate data acquisition performance is required. The new CMOS analog muxes provide an extended maximum voltage rating to 44V, with rail-to-rail analog capability, and can be operated in either a dual or single supply configuration. The devices are fabricated on an enhanced SG-II CMOS process with channel off-leakage typically less than 3pA in a wide analog signal range. The source-off parasitic capacitance is minimized to 3pF, and charge injection is less than 2pC. The result is precise, low-glitch switching performance. The devices' ultralow power consumption, typically 10µA at 25°C with a guaranteed maximum of 600µA over temperature, is greater than 60 percent lower than the next best devices on the market, making the devices well suited for portable, battery-operated applications. The enhanced SG-II CMOS process also allows the new devices to achieve a -3dB bandwidth greater than 200MHz with crosstalk and off-isolation of -40dB at 100MHz, making the DG508B and DG509B a versatile fit for a wide range of analog signal applications, including video. The on-channel of the DG508B and DG509B conducts current equally well in both directions, while each channel blocks voltages up to the power supply rails in the off state. The muxes feature an enable function to reset all switches to off for stacking of several devices. Features also include TTL-compatible logic and break-before-make switching action to protect against momentary crosstalk between adjacent channels. The DG508B and DG509B are both available in 16-pin SOIC and TSSOP packages with an extended temperature range of -40°C to 125°C. The devices feature Pb-free terminations and are RoHS-compliant and halogen-free according to IEC 61249-2-21.
Samples of the new analog muxes are available now. Production quantities will be available in July 2009, with lead times of 10 weeks for larger orders.

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