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MD0107K6-G Schematic ( PDF Datasheet ) - Supertex

Teilenummer MD0107K6-G
Beschreibung Auto Damping Device
Hersteller Supertex
Logo Supertex Logo 




Gesamt 5 Seiten
MD0107K6-G Datasheet, Funktion
Supertex inc.
MD0107
Quad High Voltage, Auto Damping Device
Features
Up to ±130V input voltage protection
35Ω typical ON resistance
Fast switching speed
No external supplies needed
Applications
Medical ultrasound imaging
NDT applications
Fast resettable fuses
High side switches
Data acquisition
Block Diagram
VPP
General Description
The MD0107 can be considered as a normally closed switch
with a typical switch resistance of 35Ω. In this state, the
MD0107 ensures that any leakage currents are shunted to
ground, while maintaining a low voltage drop. This low voltage
level is beneficial as it ensures that the anti-parallel diodes
in the transmit path remain off during the receive cycle of the
system. Thus the anti-parallel diodes more effectively block the
small signals and prevent transmitter noise from contaminating
the receive signal.
 
During operation of the pulser, the MD0107 switch opens and
thus presents a high impedance to the transmitter pulse. The
switch opens as soon as the voltage across it exceeds +/-2V and
can withstand up to +/-130V. In this off-state, the MD0107 has
very little effect on the transmit pulses or the power dissipated
by the pulser.
 
The impedance of the MD0107, when the voltage across it is
low, is suitable for terminating transmission lines. Where the line
impedance is higher than the nominal 35Ω of the MD0107, a
series resistor can be added; for example terminating a ~75Ω
line can be effectively achieved by adding a 39Ω resistor. Without
correct line termination, reflections can cause higher signal loss
and degrade image quality in ultrasound systems.
+130V
TX
RTZ Pulser
VNN
RX
Receiver
MD0107
Auto Damper
MD0105
T/R Switch
-130V
X
Doc.# DSFP-MD0107
NR012714
Supertex inc.
www.supertex.com
Free Datasheet http://www.datasheet4u.net/





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