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HV738
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Supertex inc.
Supertex inc.
www.supertex.com
HV738DB1
Doc.# DSDB-HV738DB1
B070114
Designing a Pulser with HV738
This demoboard data sheet describes how to use the
HV738DB1 to generate the basic high voltage pulse
waveform as an ultrasound transmitting pulser.
The HV738 circuit uses the DC coupling method in all
level translators. There are no external coupling capacitors
needed. The VPP and VNN rail voltages can be changed
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 HV738 has high-speed level
translators that are able to operate with logic signals of 1.2
to 5.0V and are optimized at 2.5 to 3.3V. In this demoboard,
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 VCC voltage of the demoboard,
and the logic-low should be reference to GND.
The HV738DB1 output waveforms can be displayed by using
an oscilloscope probe directly connected to the test point
TX1~4 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 HV738 transmitter pulser.
Typical Application Circuit
HV738 ±65V 0.75A
Ultrasound Pulser Demoboard
Introduction
The HV738 is a monolithic four channel, high speed, high
voltage, ultrasound transmitter pulser. This integrated, high
performance circuit is in a single 7x7mm, 48-lead QFN
package.
The HV738 can deliver up to ±0.75A 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.
HV738’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 ±1.1A for pulsing, when MC0 = 1 and MC1 = 1, with
up to ±65V swings. When in mode 1, all the output stages
drop the peak current to ±140mA for low-voltage CW mode
operation to save power. Two oating 8.0VDC power
supplies, referenced to VPP and VNN, supply the P- and N-type
power FET gate drivers. This pulser waveform’s frequency
upper limit is 20MHz depending on the load capacitance.
One HV738 can also be used as four damping circuits to
generate fast return-to-zero waveforms by working with
another HV738 as four pulsing circuits. It also has built-in
under-voltage and over-temperature protection functions.
Level
Translator
V
PP
-8V
V
PF
V
DD
+8.0V
V
PP
V
NN
0 to -65V
TXN1
V
NN
+ 8V
N-Driver
1 of 4 Channels Shown
TXP1 HV
OUT
1
V
NF
V
SUB
V
LL
+2.5V +65V
V
SS
VCC
OTP
EN
MC0
MC1
PIN1
NIN1
GREF
GND
GND
Logic
Control
0V to +65V
RGND
P-Driver
HV738
Level
Translator
RGND
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | HV738 |
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