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 ampli- fier capable of output voltage swings of 170v with dual supplies or 340v total supply voltage on single or non-symmet- ric supplies. high accuracy is achieved with a cascode input circuit configu- ration. 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 protec- tion 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 war- ranty. 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 .2 m f 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 3 5 6 2 7 8 d1 q1 q3 q5 q2 d2 c4 q12a q12b 4 q15 q4 c3 q11 q16 q6 c1 q7 q19 q17 1 q10 q9 c2 q8 100 300 200 20 30 40 50 100 150 15 250 150 125 175 350 90 80 safe operating area curve (soa) supply to output differential voltage (v) output current from +v s or ? s (ma) t = 200? t = 0.5ms t = 1ms t = 5ms steady state 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. http://www.apexmicrotech.com (800) 546-apex (800) 546-2739 microtechnology power operational amplifier PA08V this data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible i naccuracies or omissions. all specifications are subject to change without notice. PA08Vu rev. f february 1998 ? 1998 apex microtechnology corp.
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