HV746

Features

HVCMOS technology for high performance

High density integration ultrasound transmitter

0 to ±75V output voltage

±2.5A source and sink current in PW mode

±800mA source and sink current in CW mode

Up to 20MHz operation frequency

Matched delay times

1.2V to 5.0V CMOS logic interface

Over temperature sensing

Under voltage protections

Built-in output drain bleed resistors

Applications

Portable medical ultrasound imaging

Piezoelectric transducer drivers

NDT ultrasound equipment

Pulse waveform generator

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General Description

The Supertex HV746 is a dual-channel monolithic high voltage

high-speed pulse generator. It is designed for portable medical

ultrasound applications. This high voltage and high-speed

integrated circuit can also be used for other piezoelectric,

capacitive or MEMS sensor in ultrasonic nondestructive

detection and sonar ranger applications.

The HV746 consists of controller logic interface circuit, level

translators, MOSFET gate drives and high current power P-

channel and N-channel MOSFETs as the output stage for

each channel. A 2-bit mode control is provided that allows the

maximum output current to be reduced for power saving.

The output stages of each channel are designed to provide

peak output currents over ±3.6A for pulsing, when in mode

4, with up to ±75V swings. When in mode 1, all the output

stages drop the peak current to ±800mA for low-voltage CW

mode operation to save power consumption of the IC. The P

and N type of power FETs gate drivers are supplied by two

floating 9.0VDC power supplies reference to V

direct coupling topology of the gate drivers not only saves two

high voltage capacitors per channel, but also makes the PCB

layout easier.

Typical Application Circuit

Dual High Speed ±75V 2.5A Ultrasound Pulser

NIN1

SU B

VPP -9V

VPF

VDD

+9V

GREF

+1.8 to 3.3V

Logic

VPP

0 to +75V

EN

MC1

C1

VNN

0 to -75V

TXN1

VNN +9V

1 of 2 Channels

C2

C3

C5

C4

TXP1

HVOUT1

X1

D1

D2

VNF

VSUB

VLL

+1.8 to 3.3V

+75V

C6

C7

EN_P WR

MC0

OT P

VSS

PIN1

RP1

RN1

RGND

HV746

Level

Translator

RGND

P-Driver

N-Driver

Level

Translator