Microchip HV7355DB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

HV7355DB1

Doc.# DSDB-HV7355DB1

B070314

General Description

The HV7355 is a monolithic eight-channel, high-speed,

high voltage, unipolar ultrasound transmitter pulser.

This integrated, high performance circuit is in a single,

8x8x0.9mm, 56-lead QFN package.

The HV7355 can deliver guaranteed ±1.5A source and sink

current to a capacitive transducer with 0 to +150V peak

voltage. 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.

The HV7355’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

typically over ±1.5A for pulsing, with up to 150V swings. The

upper limit frequency of the pulser waveform is dependent

upon the load capacitance. With different capacitance load

conditions the maximum output frequency is about 20MHz.

This demoboard datasheet describes how to use the

HV7355DB1 to generate the basic high voltage pulse

waveform as an ultrasound transmitting pulser.

The HV7355 circuit uses DC-coupling from a 3.3V logic input

to output TX0~7 internally, therefore the chip needs three

sets of voltage supply rails: VLL (+3.3V), VDD/VSS (+/-5.0V)

and VPP(up to +150V). The VPPhigh voltage supply can be

changed rather quickly, compared to the capacitor gate-

coupled driving pulsers. 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 control signal logic-high voltage should be the same

as the VLL voltage of the IC, and the logic-low should be

referenced to GND.

The HV7355DB1 output waveforms can be displayed using

an oscilloscope by connecting the scope probe to the test

points TX0~7 and GND. The soldering jumper can select

whether or not to connect the on-board dummy load, a

330pF capacitor paralleling with a 2.5kΩ resistor. The test

points can be used to connect the user’s transducer to easily

evaluate the pulser.

Block Diagram

150V, 1.5A, Unipolar

Ultrasound Pulser Demoboard

LT

IN0

IN7

VLL

GND

MC

VSS

VSS

+5.0 to 150V+3.3V

CPF VPPVDD

VPF

CWD

Q[7:0]

LT

LT

LT

-5.0V

D0

SDI

Q7

SDO

SCK

SET

LE

CS

EN PWR

RGND

RGND

RGND

SUB

Q7

Q0

AVDD

VSUB

TX0

R3

2.5k

C4

330pF

GND

Dummy

Load

R2

Waveform

Generator

CPLD

+3.3V

OSC

JTAG

EXCLK

EN

CLKIN

WAVE

FREQ

SEL

EN

CW/RTZ

CW

LR

RTZ

PWR

EN

40MHz

6

TX7

LR

VDD

VDD VPP

VDD

VDD

VDD

VDD

VPF

VPF

VPP

TX7

VPP

+5.0V

Product specificaties