DESCRIPTION

The PA80 series of high voltage operation amplifiers provides an extremely wide range of supply capability with two over lapping products. High accuracy is achieved with a cascode input circuit configuration. All internal biasing is referenced to a zener diode. As a result, these models offer outstanding common mode and power supply rejection. The output stage operates in the class A/B mode for best linearity. Internal phase compensation assures stability at all gain settings without external components. Fixed internal current limits protect these amplifiers against a short circuit to common at most supply voltages. For sustained high energy flyback, external fast recovery diodes should be used. However, a heatsink may be necessary to maintain the proper case temperature under normal operating conditions.

FEATURES

• HIGH VOLTAGE OPERATION — ±150V (PA82J)

• HIGH OUTPUT CURRENT — ±30mA (PA81J)

• LOW BIAS CURRENT, LOW NOISE — FET Input

APPLICATIONS

• HIGH IMPEDANCE BUFFERS UP TO ±140V

• ELECTROSTATIC TRANSDUCER & DEFLECTION

• PROGRAMMABLE POWER SUPPLIES TO ±145V

• BIOCHEMISTRY STIMULATORS

• COMPUTER TO VACUUM TUBE INTERFACE

TYPICAL APPLICATION

The PA81 and 70K ohm resistor form a current to voltage converter, accepting ±1mA from a 12 bit current output digital to analog converter. The power op amp contribution to the er ror budget is insignificant. At a case temperature of 70°C, the combination of voltage offset and bias errors amounts to less than 31ppm of full scale range. Incorporation of the optional offset trim can further reduce these errors to under 9ppm.