DESCRIPTION
The PA89 is an ultra high voltage, MOSFET operational amplifer designed for output currents up to 75 mA. Output voltages can swing over 1000V p-p. The safe operating area (SOA) has no second breakdown limitations and can be observed with all types of loads by choosing an appropriate current limiting resistor. High accuracy is achieved with a cascode input circuit confguration and 120dB open loop gain. All internal biasing is referenced to a bootstrapped zener-MOSFET current source, giving the PA89 a wide supply range and excellent supply rejection. The MOSFET output stage is biased for class A/B linear operation. External compensation provides user flexibility. The PA89 is 100% gross leak tested to military standards for long term reliability.
This hybrid integrated circuit utilizes a beryllia (BeO) substrate, thick flm resistors, ceramic capacitors and semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The MO-127 High Voltage, Power Dip™ package is hermetically sealed and electrically isolated. The use of compressible thermal washers will void the product warranty.

FEATURES
• 1140V P-P SIGNAL OUTPUT
• WIDE SUPPLY RANGE — ±75V to ±600V
• PROGRAmmAbLE CURRENT LImIT
• 75 mA CONTINUOUS OUTPUT CURRENT
• HERmETIC SEALED PACKAGE
• INPUT PROTECTION

APPLICATIONS
• PIEZOELECTRIC POSITIONING
• HIGH VOLTAGE INSTRUmENTATION
• ELECTROSTATIC DEFLECTION
• SEmICONDUCTOR TESTING