HV230/HV232

Features

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

Applications

Medical ultrasound imaging

Piezoelectric transducer drivers

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Block Diagram

Low Charge Injection 8-Channel High Voltage

Analog Switches with Bleed Resistors

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

LE CL

SW0

SW1

SW2

SW3

SW4

SW5

SW6

SW7

RGND

CLK

8-Bit

Shift

Register

Latches

Level

Shifters

Output

Switches

D

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL