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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
8-PIN TO-3
PACKAGE STYLE CE
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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APPLICATIONS
• PROGRAMMABLE POWER SUPPLIES UP TO 340V
• ELECTROSTATIC TRANSDUCERS & DEFLECTION
• PIEZO ELECTRIC TRANSDUCERS
• HIGH VOLTAGE INSTRUMENTATION
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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”.
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EQUIVALENT SCHEMATIC
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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.
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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.
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This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible
ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 •
inaccuracies or omissions. All specifications are subject to change without notice.
PA08VU REV F FEBRUARY 1998
© 1998 Apex Microtechnology Corp.
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APEX [ CIRRUS LOGIC ]
