32-Channel High Voltage Amplifier Array

Features

❑ 32 independent high voltage amplifiers

❑ 300V operating voltage

❑ 295V output voltage

❑ 2.2V/µs typical output slew rate

❑ Adjustable output current limit

❑ Internal closed loop gain of 72V/V

❑ 12MΩ feedback impedance

❑ Layout ideal for die applications

Application

❑ MEMS (microelectromechanical systems) driver

❑ Piezoelectric transducer driver

❑ Optical crosspoint switches (using MEMS technology)

General Description

The Supertex HV256 is a 32-channel high voltage amplifier array

integrated circuit. It operates on a single high voltage supply, up

The input voltage range is from 0V to 4.096V. The internal closed

loop gain is 72V/V giving an output voltage of 295V when 4.096V

is applied. Input voltages of up to 5V can be applied but will cause

the output to saturate. The maximum output voltage swing is 5V

tive loads of up to 3000pF.

The maximum output source and sink current can be adjusted

resistor controls the maximum sinking current. The current limit

is approximately 12.5V divided by the external resistor value.

The setting is common for all 32 outputs. A low voltage silicon

junction diode is made available to help monitor the die

temperature.

Block Diagram

HV256

GND

R

71R

Output Current Source

R

R

Output Current Sink

71R

71R

Anode

Cathode

Demo

Kit

Availab

le

A112304