HV230/HV232
Low Charge Injection 8-Channel High Voltage
Analog Switches with Bleed Resistors
Features
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HVCMOS
®
technology for high performance
Very low quiescent power dissipation – 10µA
Output On-resistance typically 22Ω
Integrated bleed resistors on the outputs
Low parasitic capacitances
DC to 10MHz analog signal frequency
-60dB typical output off isolation at 5.0MHz
CMOS logic circuitry for low power
Excellent noise immunity
On-chip shift register, latch and clear logic circuitry
Flexible high voltage supplies
General Description
The Supertex HV230 and HV232 are low charge injection 8-
channel high-voltage analog switch integrated circuits(ICs)
with bleed resistors. These devices can be used in applications
requiring high voltage switching controlled by low voltage
control signals, such as ultrasound imaging and printers. The
bleed resistors eliminate voltage built up on capacitive loads
such as piezoelectric transducers. Input data is shifted into
an 8-bit shift register which can then be retained in an 8-bit
latch. To reduce any possible clock feed-through noise, Latch
Enable Bar (LE) should be left high until all bits are clocked
in. Using HVCMOS technology, this switch combines high
voltage bilateral DMOS switches and low power CMOS logic
to provide efficient control of high voltage analog signals.
These ICs are suitable for various combinations of high voltage
supplies, e.g., V
PP
/V
NN
: +50V/–150V, or +100V/–100V.
Applications
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Medical ultrasound imaging
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Piezoelectric transducer drivers
Block Diagram
Latches
D
LE
CL
Level
Shifters
Output
Switches
SW0
D
IN
D
LE
CL
SW1
CLK
D
LE
CL
SW2
8-Bit
Shift
Register
D
LE
CL
SW3
D
LE
CL
SW4
D
LE
CL
SW5
D
OUT
D
LE
CL
SW6
D
LE
CL
SW7
V
DD
LE CL
V
NN
V
PP
RGND
SUPERTEX [ Supertex, Inc ]
