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FEATURES
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WIDE SUPPLY RANGE — ±15V to ±150V
PROGRAMMABLE OUTPUT CURRENT LIMIT
HIGH OUTPUT CURRENT — Up to ±150mA
LOW BIAS CURRENT — FET Input
APPLICATIONS
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HIGH VOLTAGE INSTRUMENTATION
ELECTROSTATIC TRANSDUCERS & DEFLECTION
PROGRAMMABLE POWER SUPPLIES UP TO 290V
ANALOG SIMULATORS
TYPICAL APPLICATION
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8-PIN TO-3
PACKAGE STYLE CE
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”.
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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.
EQUIVALENT SCHEMATIC
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EXTERNAL CONNECTIONS
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
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