General Description
The Supertex MD1812 is a high-speed quad MOSFET driver. It is designed to drive two N and two P-channel high voltage DMOS FETs for medical ultrasound applications but may be used in any application that needs a high output current for a capacitive load. The input stage of the MD1812 is a high-speed level translator that is able to operate from logic input signals of 1.2 to 5.0 volt amplitude. An adaptive threshold circuit is used to set the level translator threshold to the average of the input logic 0 and logic 1 levels. The level translator uses a proprietary circuit, which provides DC coupling together with high-speed operation. The output stage of the MD1812 has separate power connections enabling the output signal L and H levels to be chosen independently from the driver supply voltages.

FEATUREs
✦ 6ns rise and fall time
✦ 2A peak output source/sink current
✦ 1.2V to 5V input CMOS compatible
✦ ±5V to ±12V supply voltage operation
✦ Smart Logic threshold
✦ Low jitter design
✦ Quad matched channels
✦ Drives two N and two P-channel MOSFETs
✦ Outputs can swing below ground
✦ Built-in level translator for negative gate bias
✦ User-defi ned damping for return-to-zero application
✦ Low inductance quad fl at no-lead package
✦ Thermally-enhanced package

APPLICATIONs
✦ Ultrasound PN code transmitter
✦ Medical ultrasound imaging
✦ Piezoelectric transducer drivers
✦ Nondestructive evaluation
✦ High speed level translator
✦ High voltage bipolar pulser