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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. 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 amplifier capable of output voltage swings of 170V with dual supplies or 340V total supply voltage on single or non-symmetric supplies. 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 supply range and excellent supply 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 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 conditions. This hybrid integrated circuit utilizes a 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 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". EQUIVALENT SCHEMATIC 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 capacitive and inductive loading are .2F and 200mH. Maximum safe current limit for a short to common is 50mA, and for a short to supply rails, the maximum is 15mA. 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 (c) 1998 Apex Microtechnology Corp. 1 |
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