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| HV748 Datasheet, PDF (1/7 Pages) Supertex, Inc – Quad High Speed ±75V 1.25A Ultrasound Pulser | |||
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HV748
Quad High Speed ±75V 1.25A Ultrasound Pulser
Features
⺠HVCMOS technology for high performance
⺠High density integration ultrasound transmitter
⺠0 to ±75V output voltage
⺠±1.25A source and sink current in Pulse mode
⺠±400mA source and sink current in CW mode
⺠Up to 20MHz operating frequency
⺠Matched delay times
⺠1.2V to 5.0V CMOS logic interface
⺠Built-in output drain bleed resistors
Application
⺠Portable medical ultrasound imaging
⺠Piezoelectric transducer drivers
⺠NDT ultrasound transmission
⺠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 current 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 ï¬oating 9.0VDC power supplies reference 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
+1.8 to 3.3V +9V
C1
C2
VLL
VDD
+1.8 to 3.3V
Logic
OTP
EN
MC0
MC1
PIN1
NIN1
EN_PWR
Level
Translator
Level
Translator
+75V VPP - 9V 0 to +75V
C3
C4
VSUB VPF
C5
VPP
SUB
RGND
RP1
P-Driver
N-Driver
TXP1
D1
HVOUT1
TXN1 D2
RN1
X1
GREF
VSS
1 of 4 Channels
HV748 VNF
C7
VNN + 9V
VNN
C6
0 to -75V
RGND
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