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Voltage protection device targets ultrasound systems

Posted: 28 Feb 2011     Print Version  Bookmark and Share

Keywords:low noise receivers  voltage protection  ultrasound systems  transmit/receive switch 

Supertex introduces the MD0105, a high-voltage, two-terminal, bi-directional voltage protection device for ultrasound systems. The patented, four-channel product consumes minimal power (200µA) while protecting receiver circuitry of ultrasound applications from high-voltage transmitter pulses.

It 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 ±2V. In the open state, 200µA 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 2V. Moreover, the product features fast switching speeds and low on resistance of 15Ω for minimal return signal attenuation and virtually undistorted ultrasound images.

According to the company, the product replaces conventional discrete transmit/receive solutions and does not require diode bridges, inductors, resistors or power rails. Because of this, component count is reduced from up to 48 to one. Also, since the IC does not need a power supply, it reduces noise and enhances dynamic range.

The MD0105 is available in an 18-lead DFN package (MD0105K6-G). The part is RoHS compliant. Samples are available from stock. Lead time for production quantities is four to six weeks after receipt of order. Pricing is Rs.164.20 ($3.58) each for the MD0105K6-G in 1K quantities.

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