HV238 Datasheet, PDF (1/6 Pages) Supertex, Inc – 16 Channel High Voltage Analog Switch With Bleed Resistors

HV238
Initial Release
16 Channel High Voltage Analog Switch
With Bleed Resistors
Features
! 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
! Medical ultrasound imaging
! Non-destructive evaluation
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_IN1 and D_IN2. A logic high on D_IN1 will turn
ON switches 0 to 7 and a logic high on D_IN2 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.
Block Diagram
V_DD
D_IN1
Latch
1
Level
Translator 1
SW0
SW0
SW7
D_IN2
LE
GND
V_PP
V_NN
V_DD
Latch
2
Level
Translator 2
1
SW7
SW8
SW8
SW15
SW15
R_GND
NR070805