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Transmit/receive switch offers protection for ultrasound devices

Posted: 25 Feb 2011 ?? ?Print Version ?Bookmark and Share

Keywords:low noise receivers? mixed signal ICs? transmit/receive switch?

Supertex Inc. has released the MD0105, a high voltage, two terminal, bi-directional voltage protection device. The patented, four-channel MD0105 consumes minimal power (200uA) while protecting receiver circuitry of ultrasound systems from high voltage transmitter pulses.

MD0105 is a normally closed switch governed by a switch control that monitors the voltage drop across terminals A and B. The switch will open if the voltage difference exceeds 2.0V. In the open state, 200uA of current will flow through the switch to determine if the high voltage is present. The switch does not close until the cross-terminal voltage drops below 2.0V.

The IC replaces the conventional discrete transmit/receive solution and requires no diode bridges, inductors, resistors or power rails. The IC typically reduces component counts from up to 48 to one. Because the IC doesn't require a power supply, MD0105 reduces noise in ultrasound circuits.

The MD0105 gives ultrasound system designers an implementable solution that protects downstream low noise receivers while consuming minimal power and board space, according to Stephen Lin, VP of marketing for Supertex. "It features fast switching speeds and low on resistance of 15? for minimal return signal attenuation and ultrasound images that are virtually undistorted," he added.

MD0105 is available in an 18-lead DFN package (MD0105K6-G). The part is RoHS compliant. Samples are available from stock and Lead-time for production quantities is 4-6 weeks ARO. Pricing is US$3.58 each for the MD0105K6-G in 1K quantities.

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