HV748_12 Datasheet, PDF (1/8 Pages) Supertex, Inc – Four-Channel, High Speed, ±75V 1.25A Ultrasound Pulser

Supertex inc.
HV748
Four-Channel, High Speed, ±75V 1.25A
Ultrasound Pulser
Features
►► HVCMOS technology for high performance
►► High density integration ultrasound transmitter
►► 0 to ±75V output voltage
►► ±1.25A source and sink current in pulse mode
►► ±400mA source and sink current in CW mode
►► Up to 20MHz operating frequency
►► Matched delay times
►► 1.2V to 5.0V CMOS logic interface
►► Built-in output drain bleed resistors
Application
►► Portable medical ultrasound imaging
►► Piezoelectric transducer drivers
►► NDT ultrasound transmission
►► Pulse waveform generator
General Description
The Supertex HV748 is a four-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 piezoelectric, capacitive or
MEMS sensing in ultrasonic nondestructive detection and sonar
ranger applications.
The HV748 consists of a controller logic interface circuit, level
translators, MOSFET gate drives and high power P-channel and
N-channel MOSFETs as the output stage for each channel.
The output stages of each channel are designed to provide peak
output currents over ±1.8A for pulsing, when in mode 4, with up
to ±75 volt swings. When in mode 1, all the output stages drop
the peak current to ±400mA for low-voltage CW mode operation
to decrease the 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_PP and V_NN. This direct coupling
topology of the gate drivers not only eliminates two high voltage
capacitors per channel, but also makes the PCB layout easier.
Typical Application Circuit
+1.8 to 3.3V
Logic
OTP
EN
MC0
MC1
PIN1
+1.8 to 3.3V +9.0V
C1
C2
VLL VDD
EN_PWR
Level
Translator
+75V ^VPP ^-9.0V 0 to +75V
C3
C4
C5
VSUB VPF
VPP
SUB
RGND
P-Driver
RP1
TXP1 D1
HV_OUT1
NIN1
Level
Translator
N-Driver
TXN1 D2
RN1
X1
GREF VSS
1 of 4 Channels
HV748 ^{VNF C7}
V_NN +9.0V
VNN
RGND
C6
0 to -75V
Doc.# DSFP-HV748
C061209
Supertex inc.
www.supertex.com