Supertex inc.
High Speed ±100V 2A
Integrated Ultrasound Pulser
Features
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HVCMOS technology for high performance
0 to ±100V output voltage
±2A source and sink current
Built-in damping for RTZ waveform capability
Gate-clamp for quick output amplitude ramping
Up to 40MHz operation frequency
±3ns matched delay times
Second harmonic is less than -40dB
1.8V to 3.3V CMOS logic interface
7x7 thermally-enhanced 44-lead QFN MCM
HV732
Initial Release
General Description
The Supertex HV732 is a single, complete, high-voltage,
high-speed, ultrasound transmitter pulser. It is designed for
medical ultrasound imaging applications.
The HV732 has built-in damping for faster RTZ waveform
capability and high voltage MOSFET gate-clamping function
for quick ramping of the output voltage amplitude.
The HV732 consists of a control logic circuit, level translators,
MOSFET gate drive buffers, clamp circuits, and high current,
high voltage MOSFETs as the ultrasound transmitter pulser
output stage.
In the output stage there are two pairs of MOSFETs. Each
pair consists of a P-channel and an N-channel MOSFET.
They are designed to have the same impedance, and can
provide peak currents of over ±2 amps. The built-in MOSFET
gate driver outputs swing 0 to 12V on P
DR
and N
DR
pins. The
P-channel damp output swings 0 to –5V on the DMPO pin.
Application
► Medical ultrasound imaging
Typical Application Circuit
P
DR
10nF
P
GATE
V
PP
0 to +100V
TX
P
+12V
P
IN
V
SUB
CLAMP
V
LL
V
LN
EN
V
DD
GND
N
IN
AV
DD
AGND
+1.8 to 3.3V
-5V
on/off
+5 to 12V
0V
+12V
Level
Trans.
Level
Trans.
Substrate, PAD
1
Buffer
PAD
3
PAD
2
Clamp
Circuit
TX
N
V
NN
0 to -100V
HV
OUT
OUT
N
Buffer
OUT
P
Bias
RGND
P
DAMP
Level
Trans.
RGND
N
N
DR
N
GATE
DMPO DMPI
10nF
10nF
NR040506
Supertex inc.
·
1235 Bordeaux Drive, Sunnyvale, CA 94089
·
Tel: (408) 222-8888
·
FAX: (408) 222-4895
·
www.supertex.com
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SUPERTEX [ Supertex, Inc ]
