Amplifier array drives MEMS-based crossconnects

Supertex has developed a 32-channel 250V amplifier array IC for driving MEMS-based optical networking systems.

Supertex has developed a 32-channel 250V amplifier array IC for driving MEMS-based optical networking systems.

The HV254 is the first in a family of high-voltage amplifier array ICs based on Supertex's high-voltage CMOS/DMOS process technology, ideal for driving MEMS (microelectromechanical systems) in optical crossconnects, switches and tunable optical laser modules.

Each of the 32 channels in the HV254 is configured as an independent, noninverting amplifier.

These outputs can swing up to 250V providing adequate movement for an optical MEMS switch and guarantee a slew rate of 3V/us that provides adequate time to switch from one optical fibre line to another.

With these highly integrated features, system designers are able to develop highly realisable systems in small form factors.

"MEMS applications are rapidly expanding in communications and information technology including wireless systems using MEMS-based RF switches", said Brian Hedayati, Director of Marketing at Supertex.

Global consumption of MEMS/MST (microstructures technology) devices is estimated to reach nearly 347 million units by the end of this year, and nearly 10.4 billion units by the end of 2006, according Venture Development Corporation.

The company also estimates the consumption of MEMS/MST devices in the communication market is projected to increase to 26.3% of the total market by year of 2006, up from 0.5% in 2001.

"HV254 along with the soon-to-be-released other members of the Supertex high-voltage MEMS driver IC family will enable these applications to be developed in less time, using less board space and at a lower cost", added Hedayati.

The HV254 operates at a 275V supply voltage with integrated high value gain setting resistors for an internal feedback path.

It is designed to operate on minimal power while still maintaining a slew rate of 3V/us.

An integrated diode is also included to help monitor die temperature for external temperature compensation and thermal protection.

The amplifier has an internal closed loop gain of 34dB or 50V/V, saving the user from having to use external gain setting resistors which reduces component count and simplifies system design and board layout.

A 5V signal applied to the input of an amplifier will therefore create an output voltage of 250V.

Samples of HV254 FG are available from stock in a small 100 lead MQFP package (lead to lead 17 x 23mm) and in die form HV254X.

Lead-time for production quantities is 4 to 5 weeks ARO, HV254FG is priced at US $96.00 each 1000-off.

The HV254DB1 demo board will be available from 15th November 2002.

(This was Electronicstalk's Top Story on 23 October 2002).

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