HV256

Features

32 independent high voltage amplifiers

300V operating voltage

295V output voltage

2.2V/µs typical output slew rate

Adjustable output current source limit

Adjustable output current sink limit

Internal closed loop gain of 72V/V

12MΩ feedback impedance

Layout ideal for die applications

Applications

MEMS (microelectromechanical systems) driver

Piezoelectric transducer driver

Optical crosspoint switches

(using MEMS technology)

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General Description

The Supertex HV256 is a 32-channel high voltage amplifier

array integrated circuit. It operates on a single high voltage

supply, up to 300V, and two low voltage supplies, V

V

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 below the V

The outputs can drive capacitive loads of up to 3000pF.

The maximum output source and sink current can be adjusted

by using two external resistors. An external R

controls the maximum sourcing current and an external R

SINK

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.

Typical Application Circuit

32-Channel High Voltage

Amplifier Array

Supertex

HV256

MEMS

Array

y

y

x

x

Micro

Processor

DAC

DAC

DAC

DAC

DAC

DAC

High Voltage

Op-Amp

Array