HV238
Initial Release
16 Channel High Voltage Analog Switch
With Bleed Resistors
Features
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Description
The Supertex HV238 is a 220V 16-channel high voltage
analog switch integrated circuit (IC) with output bleed
resistors (R
INT
). The output switches are configured as 2
sets of 8 single pole single throw analog switches. It is
intended to be used in applications requiring high voltage
switching controlled by low voltage control signals such as
ultrasound imaging.
The 2 sets of 8 analog switches are controlled by 2 input
logic controls, D
IN
1 and D
IN
2. A logic high on D
IN
1 will turn
ON switches 0 to 7 and a logic high on D
IN
2 will turn ON
switches 8 to 15. The bleed resistors help to significantly
reduce voltage built up on capacitive loads such as
piezoelectric transducers connected to the outputs.
HVCMOS technology for high performance
220V operating conditions
Output On-resistance typically 22Ω
Integrated bleed resistors on the outputs
5.0V and 12.0V CMOS logic compatibility
Very low quiescent power dissipation -10µA
-45dB min off isolation at 7.5MHz
Low parasitic capacitance
Excellent noise immunity
Flexible operating supply voltages
Applications
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Medical ultrasound imaging
Non-destructive evaluation
Block Diagram
V
DD
D
IN
1
Latch
1
Level
Translator 1
SW0
SW0
SW7
V
DD
D
IN
2
LE
GND
V
PP
V
NN
Latch
2
Level
Translator 2
SW7
SW8
SW8
SW15
SW15
R
GND
NR070805
1
SUPERTEX [ Supertex, Inc ]
