Supertex amplifier array drives MEMS apps

The HV254 32-channel, 250V amplifier array IC from Supertex Inc. is based on the company's high-voltage CMOS/DMOS process technology and is suitable for driving MEMS in optical cross-connects, switches, and tunable optical laser modules.

Each of the 32 channels in device is configured as an independent, non-inverting amplifier whose outputs can swing up to 250V. This provides adequate movement for an optical MEMS switch and guarantee a slew rate of 3V/5s that provides adequate time to switch from one optical fiber line to another.

Available in a 17-by-23mm 100-lead MQFP (HV254FG) and in die form (HV254X), the amplifier operates from a 275V supply voltage with integrated high value gain setting resistors for an internal feedback path. An integrated diode is also included to help monitor die temperature for external temperature compensation and thermal protection.

The HV254 also has an internal closed loop gain of 34dB, eliminating the need for external gain setting resistors. A 5V signal applied to the input of an amplifier will deliver an output voltage of 250V.