HV230/232
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 22 ohms
Integrated bleed resistors on the outputs
Low parasitic capacitances
DC to 10MHz analog signal frequency
-60dB typical output off isolation at 5MHz
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
Piezoelectric transducer drivers
Block Diagram
LATCHES
LEVEL
SHIFTERS
OUTPUT
SWITCHES
D
LE
CL
D
IN
SW0
D
LE
CL
CLK
SW1
D
LE
CL
SW2
D
LE
CL
8 BIT
SHIFT
REGISTER
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
1
NR032505
NR011705
SUPERTEX [ Supertex, Inc ]
