HV748
Quad High Speed ±75V 1.25A Ultrasound Pulser
Features
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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
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 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.
Application
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Portable medical ultrasound imaging
Piezoelectric transducer drivers
NDT ultrasound transmission
Pulse waveform generator
Typical Application Circuit
+1.8 to 3.3V +9V
C1
V
LL
OTP
EN
MC0
MC1
PIN1
+1.8 to 3.3V
Logic
NIN1
Level
Translator
N-Driver
R
N1
X1
1 of 4 Channels
+75V V
PP
- 9V 0 to +75V
C3
V
SUB
SUB
C2
V
DD
C4
V
PF
V
PP
C5
EN_PWR
RGND
R
P1
Level
Translator
P-Driver
TXP1
D1
HV
OUT
1
TXN1
D2
RGND
V
NN
C7
C6
0 to -75V
G
REF
V
SS
HV748
V
NF
V
NN
+ 9V
SUPERTEX [ Supertex, Inc ]
