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HV230/232

NR011705

Low Charge Injection 8-Channel High Voltage

Analog Switches with Bleed Resistors

Features

❏ 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

Block Diagram

D

LE

CL

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL

D

LE

CL

8 BIT

SHIFT

REGISTER

LEVEL

SHIFTERS

OUTPUT

SWITCHES

LATCHES

SW0

SW1

SW2

SW3

SW4

SW5

SW6

SW7

RGND

CLK

Applications

❏ Medical ultrasound imaging

❏ Piezoelectric transducer drivers

HV230/HV232

NR032505

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

+100V/–100V.