HV738_11 Datasheet, PDF (1/8 Pages) Supertex, Inc – Four-Channel, High Speed, ±65V 750mA Ultrasound Pulser

Supertex inc.
HV738
Four-Channel, High Speed, ±65V 750mA
Ultrasound Pulser
Features
►► HVCMOS technology for high performance
►► High density integration ultrasound transmitter
►► 0 to ±65V output voltage
►► ±750mA source and sink current in Pulse mode
►► ±110mA source and sink current in CW mode
►► Up to 20MHz operating frequency
►► Matched delay times
►► 1.2 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 HV738 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 HV738 consists of a controller logic interface circuit, level
translators, MOSFET gate drivers 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 ±1.1A for pulsing, when in mode 4, with up to
±65 volt swings. When in mode 1, all the output stages drop the
peak current to ±140mA 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 8.0VDC power
supplies referenced to VPP and VNN. 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
+1.5 to 2.5V +8.0V
C1
C2
+65V VPP -8.0V 0 to +65V
C3
C4
C5
+1.5 to 2.5V
Logic
OTP
EN
MC0
MC1
PIN1
VLL VDD
EN_PWR
Level
Translator
VSUB VPF
SUB
P-Driver
VPP
RGND
R_P1
D1
TXP1
TXN1
HV_OUT1
NIN1
Level
Translator
N-Driver
R_N1
GREF VSS
1 of 4 Channels
HV738
VNF
C7
V_NN +8V
VNN
C6
0 to -65V
D2
X1
RGND
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com