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

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FEATURES

• EXTENDED SUPPLY RANGE

UP TO ±175V or

350V TOTAL

• PROVIDES PA08 PERFORMANCE

UP TO ±150mA

PROGRAMMABLE CURRENT LIMIT

LOW DRIFT FET INPUT

APPLICATIONS

• PROGRAMMABLE POWER SUPPLIES UP TO 340V

• ELECTROSTATIC TRANSDUCERS & DEFLECTION

• PIEZO ELECTRIC TRANSDUCERS

• HIGH VOLTAGE INSTRUMENTATION

DESCRIPTION

The PA08V is an extended supply range operational am-

plifier capable of output voltage swings of ±170V with dual

supplies or 340V total supply voltage on single or non-sym-

metric supplies.

High accuracy is achieved with a cascode input circuit con-

figuration. All internal biasing is referenced to a zener diode

fed by a FET constant current source. As a result, the PA08

features an unprecedented supply range and excellent sup-

ply rejection. The output stage is biased class A-B 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 limit-

ing 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 conditions.

This hybrid integrated circuit utilizes a beryllia (BeO) sub-

strate, thick film resistors, ceramic capacitors, and semicon-

ductor chips to maximize reliability, minimize size and give top

performance. Ultrasonically bonded aluminum wires provide

reliable interconnections at all operating temperatures. The

8-pin to 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”.

SPECIFICATIONS

Specifications of the standard PA08 apply with the benefit

of supply ratings being extended to ±175V. Design changes

enabling the total supply rating of 350V have no effect on the

shape of the typical performance graphs.

GENERAL CONSIDERATIONS

SAFE OPERATING AREA

The extended safe operating area is as follows:

When operating on ±175V, maximum safe values of capaci-

tive and inductive loading are .2µF and 200mH. Maximum safe

current limit for a short to common is 50mA, and for a short to

supply rails, the maximum is 15mA.

EQUIVALENT SCHEMATIC

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Please consult the PA08 data sheet for basic information on

this amplifier, plus the application notes in this APEX DATA

BOOK, for recommendations on stability, current limiting,

heatsinks, bypassing, and suggestions for circuit functions.

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This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.

PA08VU REV F FEBRUARY 1998 © 1998 Apex Microtechnology Corp.

8-PIN TO-3

PACKAGE STYLE CE