APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

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FEATURES

• WIDE SUPPLY RANGE — ±15V to ±150V

• PROGRAMMABLE OUTPUT CURRENT LIMIT

• HIGH OUTPUT CURRENT — Up to ±150mA

• LOW BIAS CURRENT — FET Input

APPLICATIONS

• HIGH VOLTAGE INSTRUMENTATION

• ELECTROSTATIC TRANSDUCERS & DEFLECTION

• PROGRAMMABLE POWER SUPPLIES UP TO 290V

• ANALOG SIMULATORS

DESCRIPTION

The PA08 is a high voltage operational amplifier designed

for output voltage swings of up to ±145V with a dual (±) sup-

ply or 290V with a single supply. High accuracy is achieved

with a cascode input circuit configuration. All internal biasing

is referenced to a zener diode fed by a FET constant current

source. As a result, the PA08 features an unprecedented sup-

ply range and excellent supply rejection. The output stage is

biased-on for linear operation. Internal phase compensation

assures stability at all gain settings. The safe operating area

(SOA) can be observed with all types of loads by choosing

the appropriate current limiting resistors. For operation into

inductive loads, two external flyback pulse protection diodes

are recommended. A heatsink may be necessary to maintain

the proper case temperature under normal operating condi-

tions.

This hybrid integrated circuit utilizes beryllia (BeO) substrate,

thick film resistors, ceramic capacitors and semiconductor chips

to maximize reliability, minimize size and give top performance.

Ultrasonically bonded aluminum wires provide reliable inter-

connections at all operating temperatures. The 8-pin TO-3

package is hermetically sealed and electrically isolated. The

use of compressible thermal isolation washers and/or improper

mounting torque will void the product warranty. Please see

“General Operating Considerations”.

EQUIVALENT SCHEMATIC

TYPICAL APPLICATION

ATE PIN DRIVER

The PA08 as a pin driver is capable of supplying high test

voltages to a device under test (DUT). Due to the possibility

of short circuits to any terminal of the DUT, current limit must

be set to be safe when limiting with a supply to output volt-

age differential equal to the amplifier supply plus the largest

magnitude voltage applied to any other pin of the DUT. In

addition, flyback diodes are recommended when the output of

the amplifier exits any equipment enclosure to prevent damage

due to electrostatic discharges. Refer to Application Note 7

for details on accuracy considerations of this circuit.

EXTERNAL CONNECTIONS

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8-PIN TO-3

PACKAGE STYLE CE