HV758DB1

Designing a Pulser with HV758

This demo board data sheet describes how to use the

HV758DB1 to generate the basic high voltage pulse

waveform as an ultrasound transmitting pulser.

The HV758 circuit uses the DC coupling method in all

level translators. There are no external coupling capacitors

needed. The V

rather quickly, compared to a high voltage capacitor gate-

coupled driving pulser. This direct coupling topology of the

gate drivers not only saves two high voltage capacitors per

channel, but also makes the PCB layout easier.

The input stage of the HV758 has high-speed level

translators that are able to operate with logic signals of

1.2V to 5.0V and are optimized at 2.5V to 3.3V. In this

demo board, the control logic signals are connected to

a high-speed ribbon cable connector. The control signal

logic-high voltage should be the same as the V

of the demo board, and the logic-low should be referenced

to GND.

The HV758DB1 output waveforms can be displayed using

an oscilloscope directly by connecting the scope probe to

the test point TX1 to 4 and GND. The soldering jumper can

select whether or not to connect the on-board equivalent-

load, a 330pF, 200V capacitor, parallel with a 2.5kΩ, 1W

resistor. Also, a coaxial cable can be used to connect the

user’s transducer to easily drive and evaluate the HV758

transmitter pulser.

Typical Application Circuit

HV758 ±90V 2.2A Ultrasound Pulser Demo Board

Introduction

The HV758 is a monolithic 4-channel, high-speed, high

voltage, ultrasound transmitter pulser. This integrated, high

performance circuit is in a single, 8x8mm, 64-Ball FCBGA

package.

The HV758 can deliver up to a ±2.2A source and sink

current to a capacitive transducer. It is designed for

medical ultrasound imaging and ultrasound material NDT

applications. It can also be used as a high voltage driver

for other piezoelectric or capacitive MEMS transducers, or

for ATE systems and pulse signal generators as a signal

source.

HV758’s circuitry consists of controller logic circuits, level

translators, gate driving buffers and a high current and high

voltage MOSFET output stage. The output stages of each

channel are designed to provide peak output currents over

±2.5A for pulsing, when MC0 = 1 and MC1 = 1, with up

to ±90V swings. When in mode 1, all the output stages

drop the peak current to ±580mA for low-voltage CW mode

operation to save power. Two floating 9VDC power supplies

referenced to V

FET gate drivers. The upper limit frequency of the pulser

waveform is 20MHz depending on the load capacitance.

One HV758 can also be used as four damping circuits to

generate fast return-to-zero waveforms by working with

another HV758 as four pulsing circuits. It also has built-in,

under-voltage and over-temperature protection functions.

NIN1

SUB

VPP-10V

+10V

+1.8 to 3.3V

Logic

0to +90V

EN

MC1

C1

0to-90V

TXN1

1 of 4 Channels

C2

C3

C5

C4

TXP1

HVout1

X1

D1

D2

+1.8 to 3.3V

+90V

C6

C7

EN_PWR

MC0

OTP

PIN1

RGND

R

P1

R

N1

RGND

P-Driver

Level

Translator

Level

Translator

N-Driver

HV758